/* * %CopyrightBegin% * * Copyright Ericsson AB 1996-2012. All Rights Reserved. * * The contents of this file are subject to the Erlang Public License, * Version 1.1, (the "License"); you may not use this file except in * compliance with the License. You should have received a copy of the * Erlang Public License along with this software. If not, it can be * retrieved online at http://www.erlang.org/. * * Software distributed under the License is distributed on an "AS IS" * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See * the License for the specific language governing rights and limitations * under the License. * * %CopyrightEnd% */ #define ERL_PROCESS_C__ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include /* offsetof() */ #include "sys.h" #include "erl_vm.h" #include "global.h" #include "erl_process.h" #include "error.h" #include "bif.h" #include "erl_db.h" #include "dist.h" #include "beam_catches.h" #include "erl_instrument.h" #include "erl_threads.h" #include "erl_binary.h" #include "beam_bp.h" #include "erl_cpu_topology.h" #include "erl_thr_progress.h" #include "erl_thr_queue.h" #include "erl_async.h" #include "dtrace-wrapper.h" #define ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED (2000*CONTEXT_REDS) #define ERTS_RUNQ_CALL_CHECK_BALANCE_REDS \ (ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED/2) #define ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST (CONTEXT_REDS/10) #define ERTS_SCHED_SPIN_UNTIL_YIELD 100 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_LONG 40 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_LONG 1000 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_LONG 20 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_LONG 1000 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM 10 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM 1000 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_SHORT 10 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_SHORT 0 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_SHORT 5 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_SHORT 0 #define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_NONE 0 #define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_NONE 0 #define ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT 1000 #define ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT 0 #if 0 || defined(DEBUG) #define ERTS_FAKE_SCHED_BIND_PRINT_SORTED_CPU_DATA #endif #if defined(DEBUG) && 0 #define HARDDEBUG #else #undef HARDDEBUG #endif #ifdef HARDDEBUG #define HARDDEBUG_RUNQS #endif #ifdef HIPE #include "hipe_mode_switch.h" /* for hipe_init_process() */ #include "hipe_signal.h" /* for hipe_thread_signal_init() */ #endif #ifdef ERTS_ENABLE_LOCK_COUNT #include "erl_lock_count.h" #endif #define MAX_BIT (1 << PRIORITY_MAX) #define HIGH_BIT (1 << PRIORITY_HIGH) #define NORMAL_BIT (1 << PRIORITY_NORMAL) #define LOW_BIT (1 << PRIORITY_LOW) #define PORT_BIT (1 << ERTS_PORT_PRIO_LEVEL) #define ERTS_EMPTY_RUNQ(RQ) \ ((ERTS_RUNQ_FLGS_GET_NOB((RQ)) & ERTS_RUNQ_FLGS_QMASK) == 0 \ && (RQ)->misc.start == NULL) #undef RUNQ_READ_RQ #undef RUNQ_SET_RQ #define RUNQ_READ_RQ(X) ((ErtsRunQueue *) erts_smp_atomic_read_nob((X))) #define RUNQ_SET_RQ(X, RQ) erts_smp_atomic_set_nob((X), (erts_aint_t) (RQ)) #ifdef DEBUG # if defined(ARCH_64) && !HALFWORD_HEAP # define ERTS_DBG_SET_INVALID_RUNQP(RQP, N) \ (RUNQ_SET_RQ((RQP), (0xdeadbeefdead0003LL | ((N) << 4))) # define ERTS_DBG_VERIFY_VALID_RUNQP(RQP) \ do { \ ASSERT((RQP) != NULL); \ ASSERT(((((Uint) (RQP)) & ((Uint) 0x3))) == ((Uint) 0)); \ ASSERT((((Uint) (RQP)) & ~((Uint) 0xffff)) != ((Uint) 0xdeadbeefdead0000LL));\ } while (0) # else # define ERTS_DBG_SET_INVALID_RUNQP(RQP, N) \ (RUNQ_SET_RQ((RQP), (0xdead0003 | ((N) << 4)))) # define ERTS_DBG_VERIFY_VALID_RUNQP(RQP) \ do { \ ASSERT((RQP) != NULL); \ ASSERT(((((UWord) (RQP)) & ((UWord) 1))) == ((UWord) 0)); \ ASSERT((((UWord) (RQP)) & ~((UWord) 0xffff)) != ((UWord) 0xdead0000)); \ } while (0) # endif #else # define ERTS_DBG_SET_INVALID_RUNQP(RQP, N) # define ERTS_DBG_VERIFY_VALID_RUNQP(RQP) #endif #define ERTS_EMPTY_RUNQ_PORTS(RQ) \ (RUNQ_READ_LEN(&(RQ)->ports.info.len) == 0 && (RQ)->misc.start == NULL) extern BeamInstr beam_apply[]; extern BeamInstr beam_exit[]; extern BeamInstr beam_continue_exit[]; #ifdef ARCH_32 union { erts_smp_dw_atomic_t pid_data; char align[ERTS_CACHE_LINE_SIZE]; } last erts_align_attribute(ERTS_CACHE_LINE_SIZE); static ERTS_INLINE Uint64 dw_aint_to_uint64(erts_dw_aint_t *dw) { #ifdef ETHR_SU_DW_NAINT_T__ return (Uint64) dw->dw_sint; #else Uint64 res; res = (Uint64) ((Uint32) dw->sint[ERTS_DW_AINT_HIGH_WORD]); res <<= 32; res |= (Uint64) ((Uint32) dw->sint[ERTS_DW_AINT_LOW_WORD]); return res; #endif } static void unint64_to_dw_aint(erts_dw_aint_t *dw, Uint64 val) { #ifdef ETHR_SU_DW_NAINT_T__ dw->dw_sint = (ETHR_SU_DW_NAINT_T__) val; #else dw->sint[ERTS_DW_AINT_LOW_WORD] = (erts_aint_t) (val & 0xffffffff); dw->sint[ERTS_DW_AINT_HIGH_WORD] = (erts_aint_t) ((val >> 32) & 0xffffffff); #endif } static ERTS_INLINE void last_pid_data_init_nob(Uint64 val) { erts_dw_aint_t dw; unint64_to_dw_aint(&dw, val); erts_smp_dw_atomic_init_nob(&last.pid_data, &dw); } static ERTS_INLINE void last_pid_data_set_relb(Uint64 val) { erts_dw_aint_t dw; unint64_to_dw_aint(&dw, val); erts_smp_dw_atomic_set_relb(&last.pid_data, &dw); } static ERTS_INLINE Uint64 last_pid_data_read_nob(void) { erts_dw_aint_t dw; erts_smp_dw_atomic_read_nob(&last.pid_data, &dw); return dw_aint_to_uint64(&dw); } static ERTS_INLINE Uint64 last_pid_data_read_acqb(void) { erts_dw_aint_t dw; erts_smp_dw_atomic_read_acqb(&last.pid_data, &dw); return dw_aint_to_uint64(&dw); } static ERTS_INLINE Uint64 last_pid_data_cmpxchg_relb(Uint64 new, Uint64 exp) { erts_dw_aint_t dw_new, dw_xchg; unint64_to_dw_aint(&dw_new, new); unint64_to_dw_aint(&dw_xchg, exp); if (erts_smp_dw_atomic_cmpxchg_relb(&last.pid_data, &dw_new, &dw_xchg)) return exp; else return dw_aint_to_uint64(&dw_xchg); } #elif defined(ARCH_64) union { erts_smp_atomic_t pid_data; char align[ERTS_CACHE_LINE_SIZE]; } last erts_align_attribute(ERTS_CACHE_LINE_SIZE); static ERTS_INLINE void last_pid_data_init_nob(Uint64 val) { erts_smp_atomic_init_nob(&last.pid_data, (erts_aint_t) val); } static ERTS_INLINE void last_pid_data_set_relb(Uint64 val) { erts_smp_atomic_set_relb(&last.pid_data, (erts_aint_t) val); } static ERTS_INLINE Uint64 last_pid_data_read_nob(void) { return (Uint64) erts_smp_atomic_read_nob(&last.pid_data); } static ERTS_INLINE Uint64 last_pid_data_read_acqb(void) { return (Uint64) erts_smp_atomic_read_acqb(&last.pid_data); } static ERTS_INLINE Uint64 last_pid_data_cmpxchg_relb(Uint64 new, Uint64 exp) { return (Uint64) erts_smp_atomic_cmpxchg_relb(&last.pid_data, (erts_aint_t) new, (erts_aint_t) exp); } #else # error "Not 64-bit, nor 32-bit architecture..." #endif static ERTS_INLINE int last_pid_data_cmp(Uint64 lpd1, Uint64 lpd2) { Uint64 lpd1_wrap; if (lpd1 == lpd2) return 0; lpd1_wrap = lpd1 + (((Uint64) 1) << 63); if (lpd1 < lpd1_wrap) return (lpd1 < lpd2 && lpd2 < lpd1_wrap) ? -1 : 1; else return (lpd1_wrap <= lpd2 && lpd2 < lpd1) ? 1 : -1; } #define ERTS_PID_DATA_MASK__ ((1 << _PID_DATA_SIZE) - 1) int erts_sched_compact_load; Uint erts_no_schedulers; ErtsProcTab erts_proc erts_align_attribute(ERTS_CACHE_LINE_SIZE); int erts_sched_thread_suggested_stack_size = -1; #ifdef ERTS_ENABLE_LOCK_CHECK ErtsLcPSDLocks erts_psd_required_locks[ERTS_PSD_SIZE]; #endif static struct { int aux_work; int tse; int sys_schedule; } sched_busy_wait; #ifdef ERTS_SMP int erts_disable_proc_not_running_opt; static ErtsAuxWorkData *aux_thread_aux_work_data; #define ERTS_SCHDLR_SSPND_CHNG_WAITER (((erts_aint32_t) 1) << 0) #define ERTS_SCHDLR_SSPND_CHNG_MSB (((erts_aint32_t) 1) << 1) #define ERTS_SCHDLR_SSPND_CHNG_ONLN (((erts_aint32_t) 1) << 2) #ifndef DEBUG #define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \ erts_smp_atomic32_set_nob(&schdlr_sspnd.changing, (VAL)) #else #define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \ do { \ erts_aint32_t old_val__; \ old_val__ = erts_smp_atomic32_xchg_nob(&schdlr_sspnd.changing, \ (VAL)); \ ASSERT(old_val__ == (OLD_VAL)); \ } while (0) #endif static struct { erts_smp_mtx_t mtx; erts_smp_cnd_t cnd; int online; int curr_online; int wait_curr_online; erts_smp_atomic32_t changing; erts_smp_atomic32_t active; struct { int ongoing; long wait_active; ErtsProcList *procs; } msb; /* Multi Scheduling Block */ } schdlr_sspnd; static struct { erts_smp_mtx_t update_mtx; erts_smp_atomic32_t no_runqs; int last_active_runqs; int forced_check_balance; erts_smp_atomic32_t checking_balance; int halftime; int full_reds_history_index; struct { int active_runqs; int reds; erts_aint32_t max_len; } prev_rise; Uint n; } balance_info; #define ERTS_BLNCE_SAVE_RISE(ACTIVE, MAX_LEN, REDS) \ do { \ balance_info.prev_rise.active_runqs = (ACTIVE); \ balance_info.prev_rise.max_len = (MAX_LEN); \ balance_info.prev_rise.reds = (REDS); \ } while (0) #endif erts_sched_stat_t erts_sched_stat; #ifdef USE_THREADS static erts_tsd_key_t sched_data_key; #endif erts_smp_rwmtx_t erts_proc_tab_rwmtx; static erts_smp_atomic32_t function_calls; #ifdef ERTS_SMP static erts_smp_atomic32_t doing_sys_schedule; static erts_smp_atomic32_t no_empty_run_queues; #else /* !ERTS_SMP */ ErtsSchedulerData *erts_scheduler_data; #endif ErtsAlignedRunQueue *erts_aligned_run_queues; Uint erts_no_run_queues; ErtsAlignedSchedulerData *erts_aligned_scheduler_data; typedef union { ErtsSchedulerSleepInfo ssi; char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErtsSchedulerSleepInfo))]; } ErtsAlignedSchedulerSleepInfo; static ErtsAlignedSchedulerSleepInfo *aligned_sched_sleep_info; static Uint last_reductions; static Uint last_exact_reductions; Uint erts_default_process_flags; Eterm erts_system_monitor; Eterm erts_system_monitor_long_gc; Eterm erts_system_monitor_large_heap; struct erts_system_monitor_flags_t erts_system_monitor_flags; /* system performance monitor */ Eterm erts_system_profile; struct erts_system_profile_flags_t erts_system_profile_flags; #if ERTS_MAX_PROCESSES > 0x7fffffff #error "Need to store process_count in another type" #endif static erts_smp_atomic32_t process_count; typedef struct ErtsTermProcElement_ ErtsTermProcElement; struct ErtsTermProcElement_ { ErtsTermProcElement *next; ErtsTermProcElement *prev; int ix; union { struct { Eterm pid; Uint64 spawned; Uint64 exited; } process; struct { Uint64 interval; } bif_invocation; } u; }; static struct { ErtsTermProcElement *start; ErtsTermProcElement *end; } saved_term_procs; ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_op_list, ErtsMiscOpList, 10, ERTS_ALC_T_MISC_OP_LIST) ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(proclist, ErtsProcList, 200, ERTS_ALC_T_PROC_LIST) #define ERTS_SCHED_SLEEP_INFO_IX(IX) \ (ASSERT_EXPR(-1 <= ((int) (IX)) \ && ((int) (IX)) < ((int) erts_no_schedulers)), \ &aligned_sched_sleep_info[(IX)].ssi) #define ERTS_FOREACH_RUNQ(RQVAR, DO) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ erts_smp_runq_unlock(RQVAR); \ } \ } while (0) #define ERTS_FOREACH_OP_RUNQ(RQVAR, DO) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&schdlr_sspnd.mtx)); \ for (ix__ = 0; ix__ < schdlr_sspnd.online; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ erts_smp_runq_unlock(RQVAR); \ } \ } while (0) #define ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, DOX) \ do { \ ErtsRunQueue *RQVAR; \ int ix__; \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \ RQVAR = ERTS_RUNQ_IX(ix__); \ erts_smp_runq_lock(RQVAR); \ { DO; } \ } \ { DOX; } \ for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) \ erts_smp_runq_unlock(ERTS_RUNQ_IX(ix__)); \ } while (0) #define ERTS_ATOMIC_FOREACH_RUNQ(RQVAR, DO) \ ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, ) /* * Local functions. */ static void init_processes_bif(void); static void save_terminating_process(Process *p); static void exec_misc_ops(ErtsRunQueue *); static void print_function_from_pc(int to, void *to_arg, BeamInstr* x); static int stack_element_dump(int to, void *to_arg, Process* p, Eterm* sp, int yreg); static void aux_work_timeout(void *unused); static void aux_work_timeout_early_init(int no_schedulers); static void aux_work_timeout_late_init(void); static void setup_aux_work_timer(void); #if defined(DEBUG) || 0 #define ERTS_DBG_CHK_AUX_WORK_VAL(V) dbg_chk_aux_work_val((V)) static void dbg_chk_aux_work_val(erts_aint32_t value) { erts_aint32_t valid = 0; valid |= ERTS_SSI_AUX_WORK_SET_TMO; valid |= ERTS_SSI_AUX_WORK_MISC; valid |= ERTS_SSI_AUX_WORK_FIX_ALLOC_LOWER_LIM; valid |= ERTS_SSI_AUX_WORK_FIX_ALLOC_DEALLOC; #if ERTS_USE_ASYNC_READY_Q valid |= ERTS_SSI_AUX_WORK_ASYNC_READY; valid |= ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN; #endif #ifdef ERTS_SMP valid |= ERTS_SSI_AUX_WORK_DELAYED_AW_WAKEUP; valid |= ERTS_SSI_AUX_WORK_MISC_THR_PRGR; valid |= ERTS_SSI_AUX_WORK_DD; valid |= ERTS_SSI_AUX_WORK_DD_THR_PRGR; valid |= ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP; #endif #if HAVE_ERTS_MSEG valid |= ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK; #endif #ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN valid |= ERTS_SSI_AUX_WORK_CHECK_CHILDREN; #endif #ifdef ERTS_SSI_AUX_WORK_REAP_PORTS valid |= ERTS_SSI_AUX_WORK_REAP_PORTS; #endif if (~valid & value) erl_exit(ERTS_ABORT_EXIT, "Invalid aux_work value found: 0x%x\n", ~valid & value); } #define ERTS_DBG_CHK_SSI_AUX_WORK(SSI) \ ERTS_DBG_CHK_AUX_WORK_VAL(erts_atomic32_read_nob(&(SSI)->aux_work)) #else #define ERTS_DBG_CHK_AUX_WORK_VAL(V) #define ERTS_DBG_CHK_SSI_AUX_WORK(SSI) #endif #ifdef ERTS_SMP static void handle_pending_exiters(ErtsProcList *); #endif #if defined(ERTS_SMP) && defined(ERTS_ENABLE_LOCK_CHECK) int erts_smp_lc_runq_is_locked(ErtsRunQueue *runq) { return erts_smp_lc_mtx_is_locked(&runq->mtx); } #endif static erts_interval_t *proc_interval; static void proc_interval_init(void) { proc_interval = erts_alloc_permanent_cache_aligned( ERTS_ALC_T_PROC_INTERVAL, sizeof(erts_interval_t)); erts_smp_interval_init(proc_interval); } static ERTS_INLINE Uint64 get_proc_interval(void) { return erts_smp_current_interval_nob(proc_interval); } static ERTS_INLINE Uint64 ensure_later_proc_interval(Uint64 interval) { return erts_smp_ensure_later_interval_nob(proc_interval, interval); } static ERTS_INLINE Uint64 step_proc_interval(void) { return erts_smp_step_interval_nob(proc_interval); } Uint64 erts_get_proc_interval(void) { return get_proc_interval(); } Uint64 erts_ensure_later_proc_interval(Uint64 interval) { return ensure_later_proc_interval(interval); } Uint64 erts_step_proc_interval(void) { return step_proc_interval(); } void erts_pre_init_process(void) { #ifdef USE_THREADS erts_tsd_key_create(&sched_data_key); #endif #ifdef ERTS_ENABLE_LOCK_CHECK { int ix; erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].get_locks = ERTS_PSD_ERROR_HANDLER_BUF_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].set_locks = ERTS_PSD_ERROR_HANDLER_BUF_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].get_locks = ERTS_PSD_SAVED_CALLS_BUF_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].set_locks = ERTS_PSD_SAVED_CALLS_BUF_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_SCHED_ID].get_locks = ERTS_PSD_SCHED_ID_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_SCHED_ID].set_locks = ERTS_PSD_SCHED_ID_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].get_locks = ERTS_PSD_DIST_ENTRY_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].set_locks = ERTS_PSD_DIST_ENTRY_SET_LOCKS; erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].get_locks = ERTS_PSD_CALL_TIME_BP_GET_LOCKS; erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].set_locks = ERTS_PSD_CALL_TIME_BP_SET_LOCKS; /* Check that we have locks for all entries */ for (ix = 0; ix < ERTS_PSD_SIZE; ix++) { ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].get_locks); ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].set_locks); } } #endif } /* initialize the scheduler */ void erts_init_process(int ncpu) { int proc_tab_sz; int max_proc_bits; int proc_bits = ERTS_PROC_BITS; erts_smp_atomic_t *proc_entry; char *proc_tab_end; erts_smp_rwmtx_opt_t proc_tab_rwmtx_opts = ERTS_SMP_RWMTX_OPT_DEFAULT_INITER; proc_tab_rwmtx_opts.type = ERTS_SMP_RWMTX_TYPE_EXTREMELY_FREQUENT_READ; proc_tab_rwmtx_opts.lived = ERTS_SMP_RWMTX_LONG_LIVED; proc_interval_init(); #ifdef ERTS_SMP erts_disable_proc_not_running_opt = 0; erts_init_proc_lock(ncpu); #endif init_proclist_alloc(); erts_smp_atomic32_init_nob(&process_count, 0); if (erts_use_r9_pids_ports) proc_bits = ERTS_R9_PROC_BITS; if (erts_proc.max > (1 << proc_bits)) erts_proc.max = 1 << proc_bits; proc_tab_sz = ERTS_ALC_CACHE_LINE_ALIGN_SIZE(erts_proc.max * sizeof(erts_smp_atomic_t)); erts_proc.tab = erts_alloc(ERTS_ALC_T_PROC_TABLE, proc_tab_sz); proc_tab_end = ((char *) erts_proc.tab) + proc_tab_sz; proc_entry = erts_proc.tab; while (proc_tab_end > ((char *) proc_entry)) { erts_smp_atomic_init_nob(proc_entry, ERTS_AINT_NULL); proc_entry++; } erts_smp_rwmtx_init_opt(&erts_proc_tab_rwmtx, &proc_tab_rwmtx_opts, "proc_tab"); last_pid_data_init_nob(~((Uint64) 0)); max_proc_bits = erts_fit_in_bits_int32((Sint32) erts_proc.max - 1); erts_proc.tab_cache_lines = proc_tab_sz/ERTS_CACHE_LINE_SIZE; erts_proc.pix_per_cache_line = ERTS_CACHE_LINE_SIZE/sizeof(erts_smp_atomic_t); if ((erts_proc.max & (erts_proc.max - 1)) | (erts_proc.pix_per_cache_line & (erts_proc.pix_per_cache_line - 1))) { /* * erts_proc.max or erts_proc.pix_per_cache_line * not a power of 2 :( */ erts_proc.pix_cl_mask = 0; erts_proc.pix_cl_shift = 0; erts_proc.pix_cli_mask = 0; erts_proc.pix_cli_shift = 0; } else { ASSERT((erts_proc.tab_cache_lines & (erts_proc.tab_cache_lines - 1)) == 0); erts_proc.pix_cl_mask = erts_proc.tab_cache_lines-1; erts_proc.pix_cl_shift = erts_fit_in_bits_int32(erts_proc.pix_per_cache_line-1); erts_proc.pix_cli_shift = erts_fit_in_bits_int32(erts_proc.pix_cl_mask); erts_proc.pix_cli_mask = (1 << (max_proc_bits - erts_proc.pix_cli_shift)) - 1; } last_reductions = 0; last_exact_reductions = 0; erts_default_process_flags = 0; } void erts_late_init_process(void) { int ix; init_processes_bif(); erts_smp_spinlock_init(&erts_sched_stat.lock, "sched_stat"); for (ix = 0; ix < ERTS_NO_PRIO_LEVELS; ix++) { Eterm atom; char *atom_str; switch (ix) { case PRIORITY_MAX: atom_str = "process_max"; break; case PRIORITY_HIGH: atom_str = "process_high"; break; case PRIORITY_NORMAL: atom_str = "process_normal"; break; case PRIORITY_LOW: atom_str = "process_low"; break; case ERTS_PORT_PRIO_LEVEL: atom_str = "port"; break; default: atom_str = "bad_prio"; ASSERT(!"bad prio"); break; } atom = am_atom_put(atom_str, sys_strlen(atom_str)); erts_sched_stat.prio[ix].name = atom; erts_sched_stat.prio[ix].total_executed = 0; erts_sched_stat.prio[ix].executed = 0; erts_sched_stat.prio[ix].total_migrated = 0; erts_sched_stat.prio[ix].migrated = 0; } } static void init_sched_wall_time(ErtsSchedWallTime *swtp) { swtp->enabled = 0; swtp->start = 0; swtp->working.total = 0; swtp->working.start = 0; swtp->working.currently = 0; } static ERTS_INLINE Uint64 sched_wall_time_ts(void) { #ifdef HAVE_GETHRTIME return (Uint64) sys_gethrtime(); #else Uint64 res; SysTimeval tv; sys_gettimeofday(&tv); res = (Uint64) tv.tv_sec*1000000; res += (Uint64) tv.tv_usec; return res; #endif } static ERTS_INLINE void sched_wall_time_change(ErtsSchedulerData *esdp, int working) { if (esdp->sched_wall_time.enabled) { Uint64 ts = sched_wall_time_ts(); if (working) { #ifdef DEBUG ASSERT(!esdp->sched_wall_time.working.currently); esdp->sched_wall_time.working.currently = 1; #endif ts -= esdp->sched_wall_time.start; esdp->sched_wall_time.working.start = ts; } else { #ifdef DEBUG ASSERT(esdp->sched_wall_time.working.currently); esdp->sched_wall_time.working.currently = 0; #endif ts -= esdp->sched_wall_time.start; ts -= esdp->sched_wall_time.working.start; esdp->sched_wall_time.working.total += ts; } } } typedef struct { int set; int enable; Process *proc; Eterm ref; Eterm ref_heap[REF_THING_SIZE]; Uint req_sched; erts_smp_atomic32_t refc; } ErtsSchedWallTimeReq; #if !HALFWORD_HEAP ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(swtreq, ErtsSchedWallTimeReq, 5, ERTS_ALC_T_SCHED_WTIME_REQ) #else static ERTS_INLINE ErtsSchedWallTimeReq * swtreq_alloc(void) { return erts_alloc(ERTS_ALC_T_SCHED_WTIME_REQ, sizeof(ErtsSchedWallTimeReq)); } static ERTS_INLINE void swtreq_free(ErtsSchedWallTimeReq *ptr) { erts_free(ERTS_ALC_T_SCHED_WTIME_REQ, ptr); } #endif static void reply_sched_wall_time(void *vswtrp) { Uint64 working = 0, total = 0; ErtsSchedulerData *esdp = erts_get_scheduler_data(); ErtsSchedWallTimeReq *swtrp = (ErtsSchedWallTimeReq *) vswtrp; ErtsProcLocks rp_locks = (swtrp->req_sched == esdp->no ? ERTS_PROC_LOCK_MAIN : 0); Process *rp = swtrp->proc; Eterm ref_copy = NIL, msg; Eterm *hp = NULL; Eterm **hpp; Uint sz, *szp; ErlOffHeap *ohp = NULL; ErlHeapFragment *bp = NULL; ASSERT(esdp); if (swtrp->set) { if (!swtrp->enable && esdp->sched_wall_time.enabled) esdp->sched_wall_time.enabled = 0; else if (swtrp->enable && !esdp->sched_wall_time.enabled) { Uint64 ts = sched_wall_time_ts(); esdp->sched_wall_time.enabled = 1; esdp->sched_wall_time.start = ts; esdp->sched_wall_time.working.total = 0; esdp->sched_wall_time.working.start = 0; esdp->sched_wall_time.working.currently = 1; } } if (esdp->sched_wall_time.enabled) { Uint64 ts = sched_wall_time_ts(); ASSERT(esdp->sched_wall_time.working.currently); ts -= esdp->sched_wall_time.start; total = ts; ts -= esdp->sched_wall_time.working.start; working = esdp->sched_wall_time.working.total + ts; } sz = 0; hpp = NULL; szp = &sz; while (1) { if (hpp) ref_copy = STORE_NC(hpp, ohp, swtrp->ref); else *szp += REF_THING_SIZE; if (swtrp->set) msg = ref_copy; else { msg = (!esdp->sched_wall_time.enabled ? am_notsup : erts_bld_tuple(hpp, szp, 3, make_small(esdp->no), erts_bld_uint64(hpp, szp, working), erts_bld_uint64(hpp, szp, total))); msg = erts_bld_tuple(hpp, szp, 2, ref_copy, msg); } if (hpp) break; hp = erts_alloc_message_heap(sz, &bp, &ohp, rp, &rp_locks); szp = NULL; hpp = &hp; } erts_queue_message(rp, &rp_locks, bp, msg, NIL #ifdef USE_VM_PROBES , NIL #endif ); if (swtrp->req_sched == esdp->no) rp_locks &= ~ERTS_PROC_LOCK_MAIN; if (rp_locks) erts_smp_proc_unlock(rp, rp_locks); erts_smp_proc_dec_refc(rp); if (erts_smp_atomic32_dec_read_nob(&swtrp->refc) == 0) swtreq_free(vswtrp); } Eterm erts_sched_wall_time_request(Process *c_p, int set, int enable) { ErtsSchedulerData *esdp = ERTS_PROC_GET_SCHDATA(c_p); Eterm ref; ErtsSchedWallTimeReq *swtrp; Eterm *hp; if (!set && !esdp->sched_wall_time.enabled) return THE_NON_VALUE; swtrp = swtreq_alloc(); ref = erts_make_ref(c_p); hp = &swtrp->ref_heap[0]; swtrp->set = set; swtrp->enable = enable; swtrp->proc = c_p; swtrp->ref = STORE_NC(&hp, NULL, ref); swtrp->req_sched = esdp->no; erts_smp_atomic32_init_nob(&swtrp->refc, (erts_aint32_t) erts_no_schedulers); erts_smp_proc_add_refc(c_p, (Sint32) erts_no_schedulers); #ifdef ERTS_SMP if (erts_no_schedulers > 1) erts_schedule_multi_misc_aux_work(1, erts_no_schedulers, reply_sched_wall_time, (void *) swtrp); #endif reply_sched_wall_time((void *) swtrp); return ref; } static ERTS_INLINE ErtsProcList * proclist_create(Process *p) { ErtsProcList *plp = proclist_alloc(); ensure_later_proc_interval(p->started_interval); plp->pid = p->id; plp->started_interval = p->started_interval; return plp; } static ERTS_INLINE void proclist_destroy(ErtsProcList *plp) { proclist_free(plp); } static ERTS_INLINE int proclist_same(ErtsProcList *plp, Process *p) { return plp->pid == p->id && plp->started_interval == p->started_interval; } ErtsProcList * erts_proclist_create(Process *p) { return proclist_create(p); } void erts_proclist_destroy(ErtsProcList *plp) { proclist_destroy(plp); } int erts_proclist_same(ErtsProcList *plp, Process *p) { return proclist_same(plp, p); } void * erts_psd_set_init(Process *p, ErtsProcLocks plocks, int ix, void *data) { void *old; ErtsProcLocks xplocks; int refc = 0; ErtsPSD *psd = erts_alloc(ERTS_ALC_T_PSD, sizeof(ErtsPSD)); int i; for (i = 0; i < ERTS_PSD_SIZE; i++) psd->data[i] = NULL; ERTS_SMP_LC_ASSERT(plocks); ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p)); xplocks = ERTS_PROC_LOCKS_ALL; xplocks &= ~plocks; if (xplocks && erts_smp_proc_trylock(p, xplocks) == EBUSY) { if (xplocks & ERTS_PROC_LOCK_MAIN) { erts_smp_proc_inc_refc(p); erts_smp_proc_unlock(p, plocks); erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL); refc = 1; } else { if (plocks & ERTS_PROC_LOCKS_ALL_MINOR) erts_smp_proc_unlock(p, plocks & ERTS_PROC_LOCKS_ALL_MINOR); erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); } } if (!p->psd) p->psd = psd; if (xplocks) erts_smp_proc_unlock(p, xplocks); if (refc) erts_smp_proc_dec_refc(p); ASSERT(p->psd); if (p->psd != psd) erts_free(ERTS_ALC_T_PSD, psd); old = p->psd->data[ix]; p->psd->data[ix] = data; ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p)); return old; } #ifdef ERTS_SMP void erts_sched_finish_poke(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flags) { switch (flags & ERTS_SSI_FLGS_SLEEP_TYPE) { case ERTS_SSI_FLG_POLL_SLEEPING: erts_sys_schedule_interrupt(1); break; case ERTS_SSI_FLG_POLL_SLEEPING|ERTS_SSI_FLG_TSE_SLEEPING: /* * Thread progress blocking while poll sleeping; need * to signal on both... */ erts_sys_schedule_interrupt(1); /* fall through */ case ERTS_SSI_FLG_TSE_SLEEPING: erts_tse_set(ssi->event); break; case 0: break; default: erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error\n", __FILE__, __LINE__); break; } } #endif static ERTS_INLINE void set_aux_work_flags_wakeup_nob(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flgs) { erts_aint32_t old_flgs; ERTS_DBG_CHK_SSI_AUX_WORK(ssi); old_flgs = erts_atomic32_read_nob(&ssi->aux_work); if ((old_flgs & flgs) == 0) { old_flgs = erts_atomic32_read_bor_nob(&ssi->aux_work, flgs); if ((old_flgs & flgs) == 0) { #ifdef ERTS_SMP erts_sched_poke(ssi); #else erts_sys_schedule_interrupt(1); #endif } } } static ERTS_INLINE void set_aux_work_flags_wakeup_relb(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flgs) { erts_aint32_t old_flgs; ERTS_DBG_CHK_SSI_AUX_WORK(ssi); old_flgs = erts_atomic32_read_bor_relb(&ssi->aux_work, flgs); if ((old_flgs & flgs) == 0) { #ifdef ERTS_SMP erts_sched_poke(ssi); #else erts_sys_schedule_interrupt(1); #endif } } static ERTS_INLINE erts_aint32_t set_aux_work_flags(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flgs) { return erts_atomic32_read_bor_nob(&ssi->aux_work, flgs); } static ERTS_INLINE erts_aint32_t unset_aux_work_flags(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flgs) { return erts_atomic32_read_band_nob(&ssi->aux_work, ~flgs); } #ifdef ERTS_SMP static ERTS_INLINE void haw_thr_prgr_current_reset(ErtsAuxWorkData *awdp) { awdp->current_thr_prgr = ERTS_THR_PRGR_INVALID; } static ERTS_INLINE ErtsThrPrgrVal haw_thr_prgr_current(ErtsAuxWorkData *awdp) { ErtsThrPrgrVal current = awdp->current_thr_prgr; if (current == ERTS_THR_PRGR_INVALID) { current = erts_thr_progress_current(); awdp->current_thr_prgr = current; } return current; } static ERTS_INLINE void haw_thr_prgr_current_check_progress(ErtsAuxWorkData *awdp) { ErtsThrPrgrVal current = awdp->current_thr_prgr; if (current != ERTS_THR_PRGR_INVALID && !erts_thr_progress_equal(current, erts_thr_progress_current())) { /* * We have used a previouly read current value that isn't the * latest; need to poke ourselfs in order to guarantee no loss * of wakeups. */ erts_sched_poke(awdp->ssi); } } static ERTS_INLINE erts_aint32_t handle_delayed_aux_work_wakeup(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { int jix, max_jix; unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_DELAYED_AW_WAKEUP); ERTS_THR_MEMORY_BARRIER; max_jix = awdp->delayed_wakeup.jix; awdp->delayed_wakeup.jix = -1; for (jix = 0; jix <= max_jix; jix++) { int sched = awdp->delayed_wakeup.job[jix].sched; erts_aint32_t aux_work = awdp->delayed_wakeup.job[jix].aux_work; ASSERT(awdp->delayed_wakeup.sched2jix[sched] == jix); awdp->delayed_wakeup.sched2jix[sched] = -1; set_aux_work_flags_wakeup_nob(ERTS_SCHED_SLEEP_INFO_IX(sched-1), aux_work); } return aux_work & ~ERTS_SSI_AUX_WORK_DELAYED_AW_WAKEUP; } static ERTS_INLINE void schedule_aux_work_wakeup(ErtsAuxWorkData *awdp, int sched, erts_aint32_t aux_work) { int jix = awdp->delayed_wakeup.sched2jix[sched]; if (jix >= 0) { ASSERT(awdp->delayed_wakeup.job[jix].sched == sched); awdp->delayed_wakeup.job[jix].aux_work |= aux_work; } else { jix = ++awdp->delayed_wakeup.jix; awdp->delayed_wakeup.sched2jix[sched] = jix; awdp->delayed_wakeup.job[jix].sched = sched; awdp->delayed_wakeup.job[jix].aux_work = aux_work; } set_aux_work_flags_wakeup_nob(awdp->ssi, ERTS_SSI_AUX_WORK_DELAYED_AW_WAKEUP); } #endif typedef struct erts_misc_aux_work_t_ erts_misc_aux_work_t; struct erts_misc_aux_work_t_ { void (*func)(void *); void *arg; }; ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_aux_work, erts_misc_aux_work_t, 200, ERTS_ALC_T_MISC_AUX_WORK) typedef union { ErtsThrQ_t q; char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErtsThrQ_t))]; } erts_algnd_misc_aux_work_q_t; static erts_algnd_misc_aux_work_q_t *misc_aux_work_queues; static void notify_aux_work(void *vssi) { set_aux_work_flags_wakeup_nob((ErtsSchedulerSleepInfo *) vssi, ERTS_SSI_AUX_WORK_MISC); } static void init_misc_aux_work(void) { int ix; ErtsThrQInit_t qinit = ERTS_THR_Q_INIT_DEFAULT; qinit.notify = notify_aux_work; init_misc_aux_work_alloc(); misc_aux_work_queues = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_MISC_AUX_WORK_Q, sizeof(erts_algnd_misc_aux_work_q_t) * (erts_no_schedulers+1)); #ifdef ERTS_SMP ix = 0; /* aux_thread + schedulers */ #else ix = 1; /* scheduler only */ #endif for (; ix <= erts_no_schedulers; ix++) { qinit.arg = (void *) ERTS_SCHED_SLEEP_INFO_IX(ix-1); erts_thr_q_initialize(&misc_aux_work_queues[ix].q, &qinit); } } static erts_aint32_t misc_aux_work_clean(ErtsThrQ_t *q, ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { switch (erts_thr_q_clean(q)) { case ERTS_THR_Q_DIRTY: set_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_MISC); return aux_work | ERTS_SSI_AUX_WORK_MISC; case ERTS_THR_Q_NEED_THR_PRGR: #ifdef ERTS_SMP set_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_MISC_THR_PRGR); erts_thr_progress_wakeup(awdp->esdp, erts_thr_q_need_thr_progress(q)); #endif case ERTS_THR_Q_CLEAN: break; } return aux_work; } static ERTS_INLINE erts_aint32_t handle_misc_aux_work(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { ErtsThrQ_t *q = &misc_aux_work_queues[awdp->sched_id].q; unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_MISC); while (1) { erts_misc_aux_work_t *mawp = erts_thr_q_dequeue(q); if (!mawp) break; mawp->func(mawp->arg); misc_aux_work_free(mawp); } return misc_aux_work_clean(q, awdp, aux_work & ~ERTS_SSI_AUX_WORK_MISC); } #ifdef ERTS_SMP static ERTS_INLINE erts_aint32_t handle_misc_aux_work_thr_prgr(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { if (!erts_thr_progress_has_reached_this(haw_thr_prgr_current(awdp), awdp->misc.thr_prgr)) return aux_work & ~ERTS_SSI_AUX_WORK_MISC_THR_PRGR; unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_MISC_THR_PRGR); return misc_aux_work_clean(&misc_aux_work_queues[awdp->sched_id].q, awdp, aux_work & ~ERTS_SSI_AUX_WORK_MISC_THR_PRGR); } #endif static ERTS_INLINE void schedule_misc_aux_work(int sched_id, void (*func)(void *), void *arg) { ErtsThrQ_t *q; erts_misc_aux_work_t *mawp; #ifdef ERTS_SMP ASSERT(0 <= sched_id && sched_id <= erts_no_schedulers); #else ASSERT(sched_id == 1); #endif q = &misc_aux_work_queues[sched_id].q; mawp = misc_aux_work_alloc(); mawp->func = func; mawp->arg = arg; erts_thr_q_enqueue(q, mawp); } void erts_schedule_misc_aux_work(int sched_id, void (*func)(void *), void *arg) { schedule_misc_aux_work(sched_id, func, arg); } void erts_schedule_multi_misc_aux_work(int ignore_self, int max_sched, void (*func)(void *), void *arg) { int id, self = 0; if (ignore_self) { ErtsSchedulerData *esdp = erts_get_scheduler_data(); if (esdp) self = (int) esdp->no; } ASSERT(0 < max_sched && max_sched <= erts_no_schedulers); for (id = 1; id <= max_sched; id++) { if (id == self) continue; schedule_misc_aux_work(id, func, arg); } } #if ERTS_USE_ASYNC_READY_Q void erts_notify_check_async_ready_queue(void *vno) { int ix = ((int) (SWord) vno) -1; set_aux_work_flags_wakeup_nob(ERTS_SCHED_SLEEP_INFO_IX(ix), ERTS_SSI_AUX_WORK_ASYNC_READY); } static ERTS_INLINE erts_aint32_t handle_async_ready(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { ErtsSchedulerSleepInfo *ssi = awdp->ssi; unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_ASYNC_READY); if (erts_check_async_ready(awdp->async_ready.queue)) { if (set_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_ASYNC_READY) & ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN) { unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN); aux_work &= ~ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN; } return aux_work; } #ifdef ERTS_SMP awdp->async_ready.need_thr_prgr = 0; #endif set_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN); return ((aux_work & ~ERTS_SSI_AUX_WORK_ASYNC_READY) | ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN); } static ERTS_INLINE erts_aint32_t handle_async_ready_clean(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { void *thr_prgr_p; #ifdef ERTS_SMP if (awdp->async_ready.need_thr_prgr && !erts_thr_progress_has_reached_this(haw_thr_prgr_current(awdp), awdp->async_ready.thr_prgr)) { return aux_work & ~ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN; } awdp->async_ready.need_thr_prgr = 0; thr_prgr_p = (void *) &awdp->async_ready.thr_prgr; #else thr_prgr_p = NULL; #endif switch (erts_async_ready_clean(awdp->async_ready.queue, thr_prgr_p)) { case ERTS_ASYNC_READY_CLEAN: unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN); return aux_work & ~ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN; #ifdef ERTS_SMP case ERTS_ASYNC_READY_NEED_THR_PRGR: erts_thr_progress_wakeup(awdp->esdp, awdp->async_ready.thr_prgr); awdp->async_ready.need_thr_prgr = 1; return aux_work & ~ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN; #endif default: return aux_work; } } #endif /* ERTS_USE_ASYNC_READY_Q */ static ERTS_INLINE erts_aint32_t handle_fix_alloc(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { ErtsSchedulerSleepInfo *ssi = awdp->ssi; erts_aint32_t res; unset_aux_work_flags(ssi, (ERTS_SSI_AUX_WORK_FIX_ALLOC_LOWER_LIM | ERTS_SSI_AUX_WORK_FIX_ALLOC_DEALLOC)); aux_work &= ~(ERTS_SSI_AUX_WORK_FIX_ALLOC_LOWER_LIM | ERTS_SSI_AUX_WORK_FIX_ALLOC_DEALLOC); res = erts_alloc_fix_alloc_shrink(awdp->sched_id, aux_work); if (res) { set_aux_work_flags(ssi, res); aux_work |= res; } return aux_work; } #ifdef ERTS_SMP void erts_alloc_notify_delayed_dealloc(int ix) { ErtsSchedulerData *esdp = erts_get_scheduler_data(); if (esdp) schedule_aux_work_wakeup(&esdp->aux_work_data, ix, ERTS_SSI_AUX_WORK_DD); else set_aux_work_flags_wakeup_relb(ERTS_SCHED_SLEEP_INFO_IX(ix-1), ERTS_SSI_AUX_WORK_DD); } static ERTS_INLINE erts_aint32_t handle_delayed_dealloc(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { ErtsSchedulerSleepInfo *ssi = awdp->ssi; int need_thr_progress = 0; ErtsThrPrgrVal wakeup = ERTS_THR_PRGR_INVALID; int more_work = 0; unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD); erts_alloc_scheduler_handle_delayed_dealloc((void *) awdp->esdp, &need_thr_progress, &wakeup, &more_work); if (more_work) { if (set_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD) & ERTS_SSI_AUX_WORK_DD_THR_PRGR) { unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD_THR_PRGR); aux_work &= ~ERTS_SSI_AUX_WORK_DD_THR_PRGR; } return aux_work; } if (need_thr_progress) { if (wakeup == ERTS_THR_PRGR_INVALID) wakeup = erts_thr_progress_later(awdp->esdp); awdp->dd.thr_prgr = wakeup; set_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD_THR_PRGR); awdp->dd.thr_prgr = wakeup; erts_thr_progress_wakeup(awdp->esdp, wakeup); } else if (awdp->dd.completed_callback) { awdp->dd.completed_callback(awdp->dd.completed_arg); awdp->dd.completed_callback = NULL; awdp->dd.completed_arg = NULL; } return aux_work & ~ERTS_SSI_AUX_WORK_DD; } static ERTS_INLINE erts_aint32_t handle_delayed_dealloc_thr_prgr(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { ErtsSchedulerSleepInfo *ssi; int need_thr_progress; int more_work; ErtsThrPrgrVal wakeup = ERTS_THR_PRGR_INVALID; ErtsThrPrgrVal current = haw_thr_prgr_current(awdp); if (!erts_thr_progress_has_reached_this(current, awdp->dd.thr_prgr)) return aux_work & ~ERTS_SSI_AUX_WORK_DD_THR_PRGR; ssi = awdp->ssi; need_thr_progress = 0; more_work = 0; erts_alloc_scheduler_handle_delayed_dealloc((void *) awdp->esdp, &need_thr_progress, &wakeup, &more_work); if (more_work) { set_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD); unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD_THR_PRGR); return ((aux_work & ~ERTS_SSI_AUX_WORK_DD_THR_PRGR) | ERTS_SSI_AUX_WORK_DD); } if (need_thr_progress) { if (wakeup == ERTS_THR_PRGR_INVALID) wakeup = erts_thr_progress_later(awdp->esdp); awdp->dd.thr_prgr = wakeup; erts_thr_progress_wakeup(awdp->esdp, wakeup); } else { unset_aux_work_flags(ssi, ERTS_SSI_AUX_WORK_DD_THR_PRGR); if (awdp->dd.completed_callback) { awdp->dd.completed_callback(awdp->dd.completed_arg); awdp->dd.completed_callback = NULL; awdp->dd.completed_arg = NULL; } } return aux_work & ~ERTS_SSI_AUX_WORK_DD_THR_PRGR; } /* * Handle scheduled thread progress later operations. */ #define ERTS_MAX_THR_PRGR_LATER_OPS 50 static ERTS_INLINE erts_aint32_t handle_thr_prgr_later_op(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { int lops; ErtsThrPrgrVal current = haw_thr_prgr_current(awdp); for (lops = 0; lops < ERTS_MAX_THR_PRGR_LATER_OPS; lops++) { ErtsThrPrgrLaterOp *lop = awdp->later_op.first; if (!erts_thr_progress_has_reached_this(current, lop->later)) return aux_work & ~ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP; awdp->later_op.first = lop->next; if (!awdp->later_op.first) { awdp->later_op.last = NULL; } lop->func(lop->data); if (!awdp->later_op.first) { awdp->later_op.last = NULL; unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP); return aux_work & ~ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP; } } return aux_work; } #endif /* ERTS_SMP */ void erts_schedule_thr_prgr_later_op(void (*later_func)(void *), void *later_data, ErtsThrPrgrLaterOp *lop) { #ifndef ERTS_SMP later_func(later_data); #else ErtsSchedulerData *esdp; ErtsAuxWorkData *awdp; int request_wakeup = 1; esdp = erts_get_scheduler_data(); ASSERT(esdp); awdp = &esdp->aux_work_data; lop->func = later_func; lop->data = later_data; lop->later = erts_thr_progress_later(esdp); lop->next = NULL; if (!awdp->later_op.last) awdp->later_op.first = lop; else { ErtsThrPrgrLaterOp *last = awdp->later_op.last; last->next = lop; if (erts_thr_progress_equal(last->later, lop->later)) request_wakeup = 0; } awdp->later_op.last = lop; set_aux_work_flags_wakeup_nob(awdp->ssi, ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP); if (request_wakeup) erts_thr_progress_wakeup(esdp, lop->later); #endif } #ifdef ERTS_SMP static erts_atomic32_t completed_dealloc_count; static void completed_dealloc(void *vproc) { if (erts_atomic32_dec_read_mb(&completed_dealloc_count) == 0) { erts_resume((Process *) vproc, (ErtsProcLocks) 0); erts_smp_proc_dec_refc((Process *) vproc); } } static void setup_completed_dealloc(void *vproc) { ErtsSchedulerData *esdp = erts_get_scheduler_data(); ErtsAuxWorkData *awdp = (esdp ? &esdp->aux_work_data : aux_thread_aux_work_data); erts_alloc_fix_alloc_shrink(awdp->sched_id, 0); set_aux_work_flags_wakeup_nob(awdp->ssi, ERTS_SSI_AUX_WORK_DD); awdp->dd.completed_callback = completed_dealloc; awdp->dd.completed_arg = vproc; } static void prep_setup_completed_dealloc(void *vproc) { erts_aint32_t count = (erts_aint32_t) (erts_no_schedulers+1); if (erts_atomic32_dec_read_mb(&completed_dealloc_count) == count) { /* scheduler threads */ erts_schedule_multi_misc_aux_work(0, erts_no_schedulers, setup_completed_dealloc, vproc); /* aux_thread */ erts_schedule_misc_aux_work(0, setup_completed_dealloc, vproc); } } #endif /* ERTS_SMP */ int erts_debug_wait_deallocations(Process *c_p) { #ifndef ERTS_SMP erts_alloc_fix_alloc_shrink(1, 0); return 1; #else /* Only one process at a time can do this */ erts_aint32_t count = (erts_aint32_t) (2*(erts_no_schedulers+1)); if (0 == erts_atomic32_cmpxchg_mb(&completed_dealloc_count, count, 0)) { erts_suspend(c_p, ERTS_PROC_LOCK_MAIN, NULL); erts_smp_proc_inc_refc(c_p); /* scheduler threads */ erts_schedule_multi_misc_aux_work(0, erts_no_schedulers, prep_setup_completed_dealloc, (void *) c_p); /* aux_thread */ erts_schedule_misc_aux_work(0, prep_setup_completed_dealloc, (void *) c_p); return 1; } return 0; #endif } #ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN void erts_smp_notify_check_children_needed(void) { int i; for (i = 0; i < erts_no_schedulers; i++) set_aux_work_flags_wakeup_nob(ERTS_SCHED_SLEEP_INFO_IX(i), ERTS_SSI_AUX_WORK_CHECK_CHILDREN); } static ERTS_INLINE erts_aint32_t handle_check_children(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_CHECK_CHILDREN); erts_check_children(); return aux_work & ~ERTS_SSI_AUX_WORK_CHECK_CHILDREN; } #endif static void notify_reap_ports_relb(void) { int i; for (i = 0; i < erts_no_schedulers; i++) { set_aux_work_flags_wakeup_relb(ERTS_SCHED_SLEEP_INFO_IX(i), ERTS_SSI_AUX_WORK_REAP_PORTS); } } erts_smp_atomic32_t erts_halt_progress; int erts_halt_code; static ERTS_INLINE erts_aint32_t handle_reap_ports(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_REAP_PORTS); awdp->esdp->run_queue->halt_in_progress = 1; if (erts_smp_atomic32_dec_read_acqb(&erts_halt_progress) == 0) { int i; erts_smp_atomic32_set_nob(&erts_halt_progress, 1); for (i = 0; i < erts_max_ports; i++) { Port *prt = &erts_port[i]; erts_smp_port_state_lock(prt); if ((prt->status & (ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP | ERTS_PORT_SFLG_HALT))) { erts_smp_port_state_unlock(prt); continue; } /* We need to set the halt flag - get the port lock */ #ifdef ERTS_SMP erts_smp_atomic_inc_nob(&prt->refc); #endif erts_smp_port_state_unlock(prt); #ifdef ERTS_SMP erts_smp_mtx_lock(prt->lock); #endif if ((prt->status & (ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP | ERTS_PORT_SFLG_HALT))) { erts_port_release(prt); continue; } erts_port_status_bor_set(prt, ERTS_PORT_SFLG_HALT); erts_smp_atomic32_inc_nob(&erts_halt_progress); if (prt->status & (ERTS_PORT_SFLG_EXITING | ERTS_PORT_SFLG_CLOSING)) { erts_port_release(prt); continue; } erts_do_exit_port(prt, prt->id, am_killed); erts_port_release(prt); } if (erts_smp_atomic32_dec_read_nob(&erts_halt_progress) == 0) { erl_exit_flush_async(erts_halt_code, ""); } } return aux_work & ~ERTS_SSI_AUX_WORK_REAP_PORTS; } #if HAVE_ERTS_MSEG static ERTS_INLINE erts_aint32_t handle_mseg_cache_check(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK); erts_mseg_cache_check(); return aux_work & ~ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK; } #endif static ERTS_INLINE erts_aint32_t handle_setup_aux_work_timer(ErtsAuxWorkData *awdp, erts_aint32_t aux_work) { unset_aux_work_flags(awdp->ssi, ERTS_SSI_AUX_WORK_SET_TMO); setup_aux_work_timer(); return aux_work & ~ERTS_SSI_AUX_WORK_SET_TMO; } static erts_aint32_t handle_aux_work(ErtsAuxWorkData *awdp, erts_aint32_t orig_aux_work, int waiting) { #undef HANDLE_AUX_WORK #define HANDLE_AUX_WORK(FLG, HNDLR) \ ignore |= FLG; \ if (aux_work & FLG) { \ aux_work = HNDLR(awdp, aux_work); \ ERTS_DBG_CHK_AUX_WORK_VAL(aux_work); \ if (!(aux_work & ~ignore)) { \ ERTS_DBG_CHK_AUX_WORK_VAL(aux_work); \ return aux_work; \ } \ } erts_aint32_t aux_work = orig_aux_work; erts_aint32_t ignore = 0; #ifdef ERTS_SMP haw_thr_prgr_current_reset(awdp); #endif ERTS_DBG_CHK_AUX_WORK_VAL(aux_work); ASSERT(aux_work); /* * Handlers are *only* allowed to modify flags in return value * and ssi flags that are explicity handled by the handler. * Handlers are, e.g., not allowed to read the ssi flag field and * then unconditionally return that value. * * Flag field returned should only contain flags for work that * can continue immediately. */ /* * Keep ERTS_SSI_AUX_WORK flags in expected frequency order relative * eachother. Most frequent first. */ #ifdef ERTS_SMP HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_DELAYED_AW_WAKEUP, handle_delayed_aux_work_wakeup); HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_DD, handle_delayed_dealloc); /* DD must be before DD_THR_PRGR */ HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_DD_THR_PRGR, handle_delayed_dealloc_thr_prgr); #endif HANDLE_AUX_WORK((ERTS_SSI_AUX_WORK_FIX_ALLOC_LOWER_LIM | ERTS_SSI_AUX_WORK_FIX_ALLOC_DEALLOC), handle_fix_alloc); #ifdef ERTS_SMP HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_THR_PRGR_LATER_OP, handle_thr_prgr_later_op); #endif #if ERTS_USE_ASYNC_READY_Q HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_ASYNC_READY, handle_async_ready); /* ASYNC_READY must be before ASYNC_READY_CLEAN */ HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_ASYNC_READY_CLEAN, handle_async_ready_clean); #endif #ifdef ERTS_SMP HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_MISC_THR_PRGR, handle_misc_aux_work_thr_prgr); #endif /* MISC_THR_PRGR must be before MISC */ HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_MISC, handle_misc_aux_work); #ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_CHECK_CHILDREN, handle_check_children); #endif HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_SET_TMO, handle_setup_aux_work_timer); #if HAVE_ERTS_MSEG HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_MSEG_CACHE_CHECK, handle_mseg_cache_check); #endif HANDLE_AUX_WORK(ERTS_SSI_AUX_WORK_REAP_PORTS, handle_reap_ports); ERTS_DBG_CHK_AUX_WORK_VAL(aux_work); #ifdef ERTS_SMP if (waiting && !aux_work) haw_thr_prgr_current_check_progress(awdp); #endif return aux_work; #undef HANDLE_AUX_WORK } typedef struct { union { ErlTimer data; char align__[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErlTimer))]; } timer; int initialized; erts_atomic32_t refc; erts_atomic32_t type[1]; } ErtsAuxWorkTmo; static ErtsAuxWorkTmo *aux_work_tmo; static void aux_work_timeout_early_init(int no_schedulers) { int i; UWord p; /* * This is done really early. Our own allocators have * not been started yet. */ p = (UWord) malloc((sizeof(ErtsAuxWorkTmo) + sizeof(erts_atomic32_t)*(no_schedulers+1)) + ERTS_CACHE_LINE_SIZE-1); if (p & ERTS_CACHE_LINE_MASK) p = (p & ~ERTS_CACHE_LINE_MASK) + ERTS_CACHE_LINE_SIZE; ASSERT((p & ERTS_CACHE_LINE_MASK) == 0); aux_work_tmo = (ErtsAuxWorkTmo *) p; aux_work_tmo->initialized = 0; erts_atomic32_init_nob(&aux_work_tmo->refc, 0); for (i = 0; i <= no_schedulers; i++) erts_atomic32_init_nob(&aux_work_tmo->type[i], 0); } void aux_work_timeout_late_init(void) { aux_work_tmo->initialized = 1; if (erts_atomic32_read_nob(&aux_work_tmo->refc)) { aux_work_tmo->timer.data.active = 0; erts_set_timer(&aux_work_tmo->timer.data, aux_work_timeout, NULL, NULL, 1000); } } static void aux_work_timeout(void *unused) { erts_aint32_t refc; int i; #ifdef ERTS_SMP i = 0; #else i = 1; #endif for (; i <= erts_no_schedulers; i++) { erts_aint32_t type; type = erts_atomic32_read_acqb(&aux_work_tmo->type[i]); if (type) set_aux_work_flags_wakeup_nob(ERTS_SCHED_SLEEP_INFO_IX(i-1), type); } refc = erts_atomic32_read_nob(&aux_work_tmo->refc); ASSERT(refc >= 1); if (refc != 1 || 1 != erts_atomic32_cmpxchg_relb(&aux_work_tmo->refc, 0, 1)) { /* Setup next timeout... */ aux_work_tmo->timer.data.active = 0; erts_set_timer(&aux_work_tmo->timer.data, aux_work_timeout, NULL, NULL, 1000); } } static void setup_aux_work_timer(void) { #ifndef ERTS_SMP if (!erts_get_scheduler_data()) set_aux_work_flags_wakeup_nob(ERTS_SCHED_SLEEP_INFO_IX(0), ERTS_SSI_AUX_WORK_SET_TMO); else #endif { aux_work_tmo->timer.data.active = 0; erts_set_timer(&aux_work_tmo->timer.data, aux_work_timeout, NULL, NULL, 1000); } } erts_aint32_t erts_set_aux_work_timeout(int ix, erts_aint32_t type, int enable) { erts_aint32_t old, refc; #ifndef ERTS_SMP ix = 1; #endif ERTS_DBG_CHK_AUX_WORK_VAL(type); ERTS_DBG_CHK_AUX_WORK_VAL(erts_atomic32_read_nob(&aux_work_tmo->type[ix])); // erts_fprintf(stderr, "t(%d, 0x%x, %d)\n", ix, type, enable); if (!enable) { old = erts_atomic32_read_band_mb(&aux_work_tmo->type[ix], ~type); ERTS_DBG_CHK_AUX_WORK_VAL(erts_atomic32_read_nob(&aux_work_tmo->type[ix])); if (old != 0 && (old & ~type) == 0) erts_atomic32_dec_relb(&aux_work_tmo->refc); return old; } old = erts_atomic32_read_bor_mb(&aux_work_tmo->type[ix], type); ERTS_DBG_CHK_AUX_WORK_VAL(erts_atomic32_read_nob(&aux_work_tmo->type[ix])); if (old == 0 && type != 0) { refc = erts_atomic32_inc_read_acqb(&aux_work_tmo->refc); if (refc == 1) { erts_atomic32_inc_acqb(&aux_work_tmo->refc); if (aux_work_tmo->initialized) setup_aux_work_timer(); } } return old; } static ERTS_INLINE void sched_waiting_sys(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting >= 0); (void) ERTS_RUNQ_FLGS_SET(rq, (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)); rq->waiting++; rq->waiting *= -1; rq->woken = 0; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_inactive); } static ERTS_INLINE void sched_active_sys(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting < 0); rq->waiting *= -1; rq->waiting--; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_active); } Uint erts_active_schedulers(void) { Uint as = erts_no_schedulers; ERTS_ATOMIC_FOREACH_RUNQ(rq, as -= abs(rq->waiting)); ASSERT(as >= 0); return as; } #ifdef ERTS_SMP static ERTS_INLINE void clear_sys_scheduling(void) { erts_smp_atomic32_set_mb(&doing_sys_schedule, 0); } static ERTS_INLINE int try_set_sys_scheduling(void) { return 0 == erts_smp_atomic32_cmpxchg_acqb(&doing_sys_schedule, 1, 0); } #endif static ERTS_INLINE int prepare_for_sys_schedule(void) { #ifdef ERTS_SMP while (!erts_port_task_have_outstanding_io_tasks() && try_set_sys_scheduling()) { if (!erts_port_task_have_outstanding_io_tasks()) return 1; clear_sys_scheduling(); } return 0; #else return !erts_port_task_have_outstanding_io_tasks(); #endif } #ifdef ERTS_SMP static ERTS_INLINE void sched_change_waiting_sys_to_waiting(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); ASSERT(rq->waiting < 0); rq->waiting *= -1; } static ERTS_INLINE void sched_waiting(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); (void) ERTS_RUNQ_FLGS_SET(rq, (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)); if (rq->waiting < 0) rq->waiting--; else rq->waiting++; rq->woken = 0; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_inactive); } static ERTS_INLINE void sched_active(Uint no, ErtsRunQueue *rq) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); if (rq->waiting < 0) rq->waiting++; else rq->waiting--; if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(no), am_active); } static int ERTS_INLINE ongoing_multi_scheduling_block(void) { ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&schdlr_sspnd.mtx)); return schdlr_sspnd.msb.ongoing; } static ERTS_INLINE void empty_runq(ErtsRunQueue *rq) { Uint32 old_flags = ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_NONEMPTY|ERTS_RUNQ_FLG_PROTECTED); if (old_flags & ERTS_RUNQ_FLG_NONEMPTY) { #ifdef DEBUG erts_aint32_t empty = erts_smp_atomic32_read_nob(&no_empty_run_queues); /* * For a short period of time no_empty_run_queues may have * been increased twice for a specific run queue. */ ASSERT(0 <= empty && empty < 2*erts_no_run_queues); #endif erts_smp_atomic32_inc_relb(&no_empty_run_queues); } } static ERTS_INLINE void non_empty_runq(ErtsRunQueue *rq) { Uint32 old_flags = ERTS_RUNQ_FLGS_SET(rq, ERTS_RUNQ_FLG_NONEMPTY); if (!(old_flags & ERTS_RUNQ_FLG_NONEMPTY)) { #ifdef DEBUG erts_aint32_t empty = erts_smp_atomic32_read_nob(&no_empty_run_queues); /* * For a short period of time no_empty_run_queues may have * been increased twice for a specific run queue. */ ASSERT(0 < empty && empty <= 2*erts_no_run_queues); #endif erts_smp_atomic32_dec_relb(&no_empty_run_queues); } } static erts_aint32_t sched_prep_spin_wait(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING); erts_aint32_t xflgs = 0; do { oflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; } while (!(oflgs & ERTS_SSI_FLG_SUSPENDED)); return oflgs; } static erts_aint32_t sched_prep_cont_spin_wait(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING); erts_aint32_t xflgs = ERTS_SSI_FLG_WAITING; do { oflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; nflgs |= oflgs & ERTS_SSI_FLG_SUSPENDED; } while (oflgs & ERTS_SSI_FLG_WAITING); return oflgs; } static erts_aint32_t sched_spin_wait(ErtsSchedulerSleepInfo *ssi, int spincount) { int until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; int sc = spincount; erts_aint32_t flgs; do { flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if ((flgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) != (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) { break; } ERTS_SPIN_BODY; if (--until_yield == 0) { until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; erts_thr_yield(); } } while (--sc > 0); return flgs; } static erts_aint32_t sched_set_sleeptype(ErtsSchedulerSleepInfo *ssi, erts_aint32_t sleep_type) { erts_aint32_t oflgs; erts_aint32_t nflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING|sleep_type; erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING; if (sleep_type == ERTS_SSI_FLG_TSE_SLEEPING) erts_tse_reset(ssi->event); else { ASSERT(sleep_type == ERTS_SSI_FLG_POLL_SLEEPING); erts_sys_schedule_interrupt(0); } while (1) { oflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; if ((oflgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) != (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) { return oflgs; } xflgs = oflgs; nflgs |= oflgs & ERTS_SSI_FLG_SUSPENDED; } } #define ERTS_SCHED_WAIT_WOKEN(FLGS) \ (((FLGS) & (ERTS_SSI_FLG_WAITING|ERTS_SSI_FLG_SUSPENDED)) \ != ERTS_SSI_FLG_WAITING) static void thr_prgr_wakeup(void *vssi) { erts_sched_poke((ErtsSchedulerSleepInfo *) vssi); } static void thr_prgr_prep_wait(void *vssi) { ErtsSchedulerSleepInfo *ssi = (ErtsSchedulerSleepInfo *) vssi; erts_smp_atomic32_read_bor_acqb(&ssi->flags, ERTS_SSI_FLG_SLEEPING); } static void thr_prgr_wait(void *vssi) { ErtsSchedulerSleepInfo *ssi = (ErtsSchedulerSleepInfo *) vssi; erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING; erts_tse_reset(ssi->event); while (1) { erts_aint32_t aflgs, nflgs; nflgs = xflgs | ERTS_SSI_FLG_TSE_SLEEPING; aflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (aflgs == xflgs) { erts_tse_wait(ssi->event); break; } if ((aflgs & ERTS_SSI_FLG_SLEEPING) == 0) break; xflgs = aflgs; } } static void thr_prgr_fin_wait(void *vssi) { ErtsSchedulerSleepInfo *ssi = (ErtsSchedulerSleepInfo *) vssi; erts_smp_atomic32_read_band_nob(&ssi->flags, ~(ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING)); } static void init_aux_work_data(ErtsAuxWorkData *awdp, ErtsSchedulerData *esdp, char *dawwp); static void * aux_thread(void *unused) { ErtsAuxWorkData *awdp = aux_thread_aux_work_data; ErtsSchedulerSleepInfo *ssi = ERTS_SCHED_SLEEP_INFO_IX(-1); erts_aint32_t aux_work; ErtsThrPrgrCallbacks callbacks; int thr_prgr_active = 1; ssi->event = erts_tse_fetch(); callbacks.arg = (void *) ssi; callbacks.wakeup = thr_prgr_wakeup; callbacks.prepare_wait = thr_prgr_prep_wait; callbacks.wait = thr_prgr_wait; callbacks.finalize_wait = thr_prgr_fin_wait; erts_thr_progress_register_managed_thread(NULL, &callbacks, 1); init_aux_work_data(awdp, NULL, NULL); awdp->ssi = ssi; sched_prep_spin_wait(ssi); while (1) { erts_aint32_t flgs; aux_work = erts_atomic32_read_acqb(&ssi->aux_work); if (aux_work) { if (!thr_prgr_active) erts_thr_progress_active(NULL, thr_prgr_active = 1); aux_work = handle_aux_work(awdp, aux_work, 1); if (aux_work && erts_thr_progress_update(NULL)) erts_thr_progress_leader_update(NULL); } if (!aux_work) { if (thr_prgr_active) erts_thr_progress_active(NULL, thr_prgr_active = 0); erts_thr_progress_prepare_wait(NULL); flgs = sched_spin_wait(ssi, 0); if (flgs & ERTS_SSI_FLG_SLEEPING) { ASSERT(flgs & ERTS_SSI_FLG_WAITING); flgs = sched_set_sleeptype(ssi, ERTS_SSI_FLG_TSE_SLEEPING); if (flgs & ERTS_SSI_FLG_SLEEPING) { int res; ASSERT(flgs & ERTS_SSI_FLG_TSE_SLEEPING); ASSERT(flgs & ERTS_SSI_FLG_WAITING); do { res = erts_tse_wait(ssi->event); } while (res == EINTR); } } erts_thr_progress_finalize_wait(NULL); } flgs = sched_prep_spin_wait(ssi); } return NULL; } #endif /* ERTS_SMP */ static void scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq) { int working = 1; ErtsSchedulerSleepInfo *ssi = esdp->ssi; int spincount; erts_aint32_t aux_work = 0; #ifdef ERTS_SMP int thr_prgr_active = 1; erts_aint32_t flgs; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); flgs = sched_prep_spin_wait(ssi); if (flgs & ERTS_SSI_FLG_SUSPENDED) { /* Go suspend instead... */ return; } /* * If all schedulers are waiting, one of them *should* * be waiting in erl_sys_schedule() */ if (!prepare_for_sys_schedule()) { sched_waiting(esdp->no, rq); erts_smp_runq_unlock(rq); spincount = sched_busy_wait.tse; tse_wait: if (thr_prgr_active != working) sched_wall_time_change(esdp, thr_prgr_active); while (1) { aux_work = erts_atomic32_read_acqb(&ssi->aux_work); if (aux_work) { if (!thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 1); sched_wall_time_change(esdp, 1); } aux_work = handle_aux_work(&esdp->aux_work_data, aux_work, 1); if (aux_work && erts_thr_progress_update(esdp)) erts_thr_progress_leader_update(esdp); } if (aux_work) flgs = erts_smp_atomic32_read_acqb(&ssi->flags); else { if (thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 0); sched_wall_time_change(esdp, 0); } erts_thr_progress_prepare_wait(esdp); flgs = sched_spin_wait(ssi, spincount); if (flgs & ERTS_SSI_FLG_SLEEPING) { ASSERT(flgs & ERTS_SSI_FLG_WAITING); flgs = sched_set_sleeptype(ssi, ERTS_SSI_FLG_TSE_SLEEPING); if (flgs & ERTS_SSI_FLG_SLEEPING) { int res; ASSERT(flgs & ERTS_SSI_FLG_TSE_SLEEPING); ASSERT(flgs & ERTS_SSI_FLG_WAITING); do { res = erts_tse_wait(ssi->event); } while (res == EINTR); } } erts_thr_progress_finalize_wait(esdp); } if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); break; } flgs = sched_prep_cont_spin_wait(ssi); spincount = sched_busy_wait.aux_work; if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); break; } } if (flgs & ~ERTS_SSI_FLG_SUSPENDED) erts_smp_atomic32_read_band_nob(&ssi->flags, ERTS_SSI_FLG_SUSPENDED); if (!thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 1); sched_wall_time_change(esdp, 1); } erts_smp_runq_lock(rq); sched_active(esdp->no, rq); } else #endif { erts_aint_t dt; erts_smp_atomic32_set_relb(&function_calls, 0); *fcalls = 0; sched_waiting_sys(esdp->no, rq); erts_smp_runq_unlock(rq); ASSERT(working); sched_wall_time_change(esdp, working = 0); spincount = sched_busy_wait.sys_schedule; if (spincount == 0) goto sys_aux_work; while (spincount-- > 0) { sys_poll_aux_work: if (working) sched_wall_time_change(esdp, working = 0); ASSERT(!erts_port_task_have_outstanding_io_tasks()); erl_sys_schedule(1); /* Might give us something to do */ dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); sys_aux_work: #ifndef ERTS_SMP erts_sys_schedule_interrupt(0); #endif aux_work = erts_atomic32_read_acqb(&ssi->aux_work); if (aux_work) { if (!working) sched_wall_time_change(esdp, working = 1); #ifdef ERTS_SMP if (!thr_prgr_active) erts_thr_progress_active(esdp, thr_prgr_active = 1); #endif aux_work = handle_aux_work(&esdp->aux_work_data, aux_work, 1); #ifdef ERTS_SMP if (aux_work && erts_thr_progress_update(esdp)) erts_thr_progress_leader_update(esdp); #endif } #ifndef ERTS_SMP if (rq->len != 0 || rq->misc.start) goto sys_woken; #else flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_woken; } /* * If we got new I/O tasks we aren't allowed to * call erl_sys_schedule() until it is handled. */ if (erts_port_task_have_outstanding_io_tasks()) { clear_sys_scheduling(); /* * Got to check that we still got I/O tasks; otherwise * we have to continue checking for I/O... */ if (!prepare_for_sys_schedule()) { spincount *= ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT; goto tse_wait; } } #endif } erts_smp_runq_lock(rq); #ifdef ERTS_SMP /* * If we got new I/O tasks we aren't allowed to * sleep in erl_sys_schedule(). */ if (erts_port_task_have_outstanding_io_tasks()) { clear_sys_scheduling(); /* * Got to check that we still got I/O tasks; otherwise * we have to wait in erl_sys_schedule() after all... */ if (!prepare_for_sys_schedule()) { /* * Not allowed to wait in erl_sys_schedule; * do tse wait instead... */ sched_change_waiting_sys_to_waiting(esdp->no, rq); erts_smp_runq_unlock(rq); spincount = 0; goto tse_wait; } } #endif if (aux_work) { erts_smp_runq_unlock(rq); goto sys_poll_aux_work; } #ifdef ERTS_SMP flgs = sched_set_sleeptype(ssi, ERTS_SSI_FLG_POLL_SLEEPING); if (!(flgs & ERTS_SSI_FLG_SLEEPING)) { if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_locked_woken; } erts_smp_runq_unlock(rq); flgs = sched_prep_cont_spin_wait(ssi); if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_woken; } ASSERT(!erts_port_task_have_outstanding_io_tasks()); goto sys_poll_aux_work; } ASSERT(flgs & ERTS_SSI_FLG_POLL_SLEEPING); ASSERT(flgs & ERTS_SSI_FLG_WAITING); #endif erts_smp_runq_unlock(rq); if (working) sched_wall_time_change(esdp, working = 0); #ifdef ERTS_SMP if (thr_prgr_active) erts_thr_progress_active(esdp, thr_prgr_active = 0); #endif ASSERT(!erts_port_task_have_outstanding_io_tasks()); erl_sys_schedule(0); dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); #ifndef ERTS_SMP if (rq->len == 0 && !rq->misc.start) goto sys_aux_work; sys_woken: #else flgs = sched_prep_cont_spin_wait(ssi); if (flgs & ERTS_SSI_FLG_WAITING) goto sys_aux_work; sys_woken: if (!thr_prgr_active) erts_thr_progress_active(esdp, thr_prgr_active = 1); erts_smp_runq_lock(rq); sys_locked_woken: if (!thr_prgr_active) { erts_smp_runq_unlock(rq); erts_thr_progress_active(esdp, thr_prgr_active = 1); erts_smp_runq_lock(rq); } clear_sys_scheduling(); if (flgs & ~ERTS_SSI_FLG_SUSPENDED) erts_smp_atomic32_read_band_nob(&ssi->flags, ERTS_SSI_FLG_SUSPENDED); #endif if (!working) sched_wall_time_change(esdp, working = 1); sched_active_sys(esdp->no, rq); } ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); } #ifdef ERTS_SMP static ERTS_INLINE erts_aint32_t ssi_flags_set_wake(ErtsSchedulerSleepInfo *ssi) { /* reset all flags but suspended */ erts_aint32_t oflgs; erts_aint32_t nflgs = 0; erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING; while (1) { oflgs = erts_smp_atomic32_cmpxchg_relb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return oflgs; nflgs = oflgs & ERTS_SSI_FLG_SUSPENDED; xflgs = oflgs; } } static void wake_scheduler(ErtsRunQueue *rq, int incq) { ErtsSchedulerSleepInfo *ssi; erts_aint32_t flgs; /* * The unlocked run queue is not strictly necessary * from a thread safety or deadlock prevention * perspective. It will, however, cost us performance * if it is locked during wakup of another scheduler, * so all code *should* handle this without having * the lock on the run queue. */ ERTS_SMP_LC_ASSERT(!erts_smp_lc_runq_is_locked(rq)); ssi = rq->scheduler->ssi; flgs = ssi_flags_set_wake(ssi); erts_sched_finish_poke(ssi, flgs); if (incq && (flgs & ERTS_SSI_FLG_WAITING)) non_empty_runq(rq); } #define ERTS_NO_USED_RUNQS_SHIFT 16 #define ERTS_NO_RUNQS_MASK 0xffff #if ERTS_MAX_NO_OF_SCHEDULERS > ERTS_NO_RUNQS_MASK # error "Too large amount of schedulers allowed" #endif static ERTS_INLINE void init_no_runqs(int active, int used) { erts_aint32_t no_runqs = (erts_aint32_t) (active & ERTS_NO_RUNQS_MASK); no_runqs |= (erts_aint32_t) ((used & ERTS_NO_RUNQS_MASK) << ERTS_NO_USED_RUNQS_SHIFT); erts_smp_atomic32_init_nob(&balance_info.no_runqs, no_runqs); } static ERTS_INLINE void get_no_runqs(int *active, int *used) { erts_aint32_t no_runqs = erts_smp_atomic32_read_nob(&balance_info.no_runqs); if (active) *active = (int) (no_runqs & ERTS_NO_RUNQS_MASK); if (used) *used = (int) ((no_runqs >> ERTS_NO_USED_RUNQS_SHIFT) & ERTS_NO_RUNQS_MASK); } static ERTS_INLINE void set_no_used_runqs(int used) { erts_aint32_t exp = erts_smp_atomic32_read_nob(&balance_info.no_runqs); while (1) { erts_aint32_t act, new; new = (used & ERTS_NO_RUNQS_MASK) << ERTS_NO_USED_RUNQS_SHIFT; new |= exp & ERTS_NO_RUNQS_MASK; act = erts_smp_atomic32_cmpxchg_nob(&balance_info.no_runqs, new, exp); if (act == exp) break; exp = act; } } static ERTS_INLINE void set_no_active_runqs(int active) { erts_aint32_t exp = erts_smp_atomic32_read_nob(&balance_info.no_runqs); while (1) { erts_aint32_t act, new; new = exp & (ERTS_NO_RUNQS_MASK << ERTS_NO_USED_RUNQS_SHIFT); new |= active & ERTS_NO_RUNQS_MASK; act = erts_smp_atomic32_cmpxchg_nob(&balance_info.no_runqs, new, exp); if (act == exp) break; exp = act; } } static ERTS_INLINE int try_inc_no_active_runqs(int active) { erts_aint32_t exp = erts_smp_atomic32_read_nob(&balance_info.no_runqs); if (((exp >> ERTS_NO_USED_RUNQS_SHIFT) & ERTS_NO_RUNQS_MASK) < active) return 0; if ((exp & ERTS_NO_RUNQS_MASK) + 1 == active) { erts_aint32_t new, act; new = exp & (ERTS_NO_RUNQS_MASK << ERTS_NO_USED_RUNQS_SHIFT); new |= active & ERTS_NO_RUNQS_MASK; act = erts_smp_atomic32_cmpxchg_nob(&balance_info.no_runqs, new, exp); if (act == exp) return 1; } return 0; } static ERTS_INLINE int chk_wake_sched(ErtsRunQueue *crq, int ix, int activate) { Uint32 flags; ErtsRunQueue *wrq; if (crq->ix == ix) return 0; wrq = ERTS_RUNQ_IX(ix); flags = ERTS_RUNQ_FLGS_GET(wrq); if (!(flags & (ERTS_RUNQ_FLG_SUSPENDED|ERTS_RUNQ_FLG_NONEMPTY))) { if (activate) { if (try_inc_no_active_runqs(ix+1)) (void) ERTS_RUNQ_FLGS_UNSET(wrq, ERTS_RUNQ_FLG_INACTIVE); } wake_scheduler(wrq, 0); return 1; } return 0; } static void wake_scheduler_on_empty_runq(ErtsRunQueue *crq) { int ix = crq->ix; int stop_ix = ix; int active_ix, balance_ix; get_no_runqs(&active_ix, &balance_ix); if (active_ix > balance_ix) active_ix = balance_ix; if (ix >= active_ix) stop_ix = ix = active_ix; /* Try to wake a scheduler on an active run queue */ while (1) { ix--; if (ix < 0) { if (active_ix == stop_ix) break; ix = active_ix - 1; } if (ix == stop_ix) break; if (chk_wake_sched(crq, ix, 0)) return; } if (active_ix < balance_ix) { /* Try to activate a new run queue and wake its scheduler */ (void) chk_wake_sched(crq, active_ix, 1); } } #endif /* ERTS_SMP */ static ERTS_INLINE void smp_notify_inc_runq(ErtsRunQueue *runq) { #ifdef ERTS_SMP if (runq) wake_scheduler(runq, 1); #endif } void erts_smp_notify_inc_runq(ErtsRunQueue *runq) { smp_notify_inc_runq(runq); } void erts_sched_notify_check_cpu_bind(void) { #ifdef ERTS_SMP int ix; for (ix = 0; ix < erts_no_run_queues; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); (void) ERTS_RUNQ_FLGS_SET(rq, ERTS_RUNQ_FLG_CHK_CPU_BIND); wake_scheduler(rq, 0); } #else erts_sched_check_cpu_bind(erts_get_scheduler_data()); #endif } static ERTS_INLINE void enqueue_process(ErtsRunQueue *runq, int prio, Process *p) { ErtsRunPrioQueue *rpq; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); erts_smp_inc_runq_len(runq, &runq->procs.prio_info[prio], prio); if (prio == PRIORITY_LOW) { p->schedule_count = RESCHEDULE_LOW; rpq = &runq->procs.prio[PRIORITY_NORMAL]; } else { p->schedule_count = 1; rpq = &runq->procs.prio[prio]; } p->next = NULL; if (rpq->last) rpq->last->next = p; else rpq->first = p; rpq->last = p; } static ERTS_INLINE void unqueue_process(ErtsRunQueue *runq, ErtsRunPrioQueue *rpq, ErtsRunQueueInfo *rqi, int prio, Process *prev_proc, Process *proc) { ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); if (prev_proc) prev_proc->next = proc->next; else rpq->first = proc->next; if (!proc->next) rpq->last = prev_proc; if (!rpq->first) rpq->last = NULL; erts_smp_dec_runq_len(runq, rqi, prio); } static ERTS_INLINE Process * dequeue_process(ErtsRunQueue *runq, int prio_q, erts_aint32_t *statep) { erts_aint32_t state; int prio; ErtsRunPrioQueue *rpq; ErtsRunQueueInfo *rqi; Process *p; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(runq)); ASSERT(PRIORITY_NORMAL == prio_q || PRIORITY_HIGH == prio_q || PRIORITY_MAX == prio_q); rpq = &runq->procs.prio[prio_q]; p = rpq->first; if (!p) return NULL; ERTS_SMP_DATA_DEPENDENCY_READ_MEMORY_BARRIER; state = erts_smp_atomic32_read_nob(&p->state); if (statep) *statep = state; prio = (int) (ERTS_PSFLG_PRIO_MASK & state); rqi = &runq->procs.prio_info[prio]; if (p) unqueue_process(runq, rpq, rqi, prio, NULL, p); return p; } static ERTS_INLINE int check_requeue_process(ErtsRunQueue *rq, int prio_q) { ErtsRunPrioQueue *rpq = &rq->procs.prio[prio_q]; Process *p = rpq->first; if (--p->schedule_count > 0 && p != rpq->last) { /* reschedule */ rpq->first = p->next; rpq->last->next = p; rpq->last = p; p->next = NULL; return 1; } return 0; } #ifdef ERTS_SMP static ErtsRunQueue * check_immigration_need(ErtsRunQueue *c_rq, ErtsMigrationPath *mp, int prio) { int len; Uint32 f_flags, f_rq_flags; ErtsRunQueue *f_rq; f_flags = mp->prio[prio].flags; ASSERT(ERTS_CHK_RUNQ_FLG_IMMIGRATE(mp->flags, prio)); f_rq = mp->prio[prio].runq; if (!f_rq) return NULL; f_rq_flags = ERTS_RUNQ_FLGS_GET(f_rq); if (f_rq_flags & ERTS_RUNQ_FLG_PROTECTED) return NULL; if (ERTS_CHK_RUNQ_FLG_EVACUATE(f_flags, prio)) return f_rq; if (f_rq_flags & ERTS_RUNQ_FLG_INACTIVE) return f_rq; if (prio == ERTS_PORT_PRIO_LEVEL) len = RUNQ_READ_LEN(&c_rq->ports.info.len); else len = RUNQ_READ_LEN(&c_rq->procs.prio_info[prio].len); if (len < mp->prio[prio].limit.this) { if (prio == ERTS_PORT_PRIO_LEVEL) len = RUNQ_READ_LEN(&f_rq->ports.info.len); else len = RUNQ_READ_LEN(&f_rq->procs.prio_info[prio].len); if (len > mp->prio[prio].limit.other) return f_rq; } return NULL; } static void immigrate(ErtsRunQueue *c_rq, ErtsMigrationPath *mp) { Uint32 iflags, iflag; erts_smp_runq_unlock(c_rq); ASSERT(erts_thr_progress_is_managed_thread()); iflags = mp->flags & ERTS_RUNQ_FLGS_IMMIGRATE_QMASK; iflag = iflags & -iflags; while (iflag) { ErtsRunQueue *rq; int prio; switch (iflag) { case (MAX_BIT << ERTS_RUNQ_FLGS_IMMIGRATE_SHFT): prio = PRIORITY_MAX; break; case (HIGH_BIT << ERTS_RUNQ_FLGS_IMMIGRATE_SHFT): prio = PRIORITY_HIGH; break; case (NORMAL_BIT << ERTS_RUNQ_FLGS_IMMIGRATE_SHFT): prio = PRIORITY_NORMAL; break; case (LOW_BIT << ERTS_RUNQ_FLGS_IMMIGRATE_SHFT): prio = PRIORITY_LOW; break; case (PORT_BIT << ERTS_RUNQ_FLGS_IMMIGRATE_SHFT): prio = ERTS_PORT_PRIO_LEVEL; break; default: erl_exit(ERTS_ABORT_EXIT, "%s:%d:%s(): Invalid immigrate queue mask", __FILE__, __LINE__, __func__); prio = 0; break; } iflags &= ~iflag; iflag = iflags & -iflags; rq = check_immigration_need(c_rq, mp, prio); if (rq) { erts_smp_runq_lock(rq); if (prio == ERTS_PORT_PRIO_LEVEL) { Port *prt; prt = erts_dequeue_port(rq); if (prt) RUNQ_SET_RQ(&prt->run_queue, c_rq); erts_smp_runq_unlock(rq); if (prt) { /* port might terminate while we have no lock... */ rq = erts_port_runq(prt); if (rq) { if (rq != c_rq) erl_exit(ERTS_ABORT_EXIT, "%s:%d:%s(): Internal error", __FILE__, __LINE__, __func__); erts_enqueue_port(c_rq, prt); if (!iflag) return; /* done */ erts_smp_runq_unlock(c_rq); } } } else { ErtsRunPrioQueue *rpq = &rq->procs.prio[prio == PRIORITY_LOW ? PRIORITY_NORMAL : prio]; Process *prev_proc = NULL; Process *proc = rpq->first; int rq_locked = 1; while (proc) { erts_aint32_t state; state = erts_smp_atomic32_read_acqb(&proc->state); if (!(ERTS_PSFLG_BOUND & state) && (prio == (int) (ERTS_PSFLG_PRIO_MASK & state))) { ErtsRunQueueInfo *rqi = &rq->procs.prio_info[prio]; unqueue_process(rq, rpq, rqi, prio, prev_proc, proc); erts_smp_runq_unlock(rq); RUNQ_SET_RQ(&proc->run_queue, c_rq); rq_locked = 0; erts_smp_runq_lock(c_rq); enqueue_process(c_rq, prio, proc); if (!iflag) return; /* done */ erts_smp_runq_unlock(c_rq); break; } prev_proc = proc; proc = proc->next; } if (rq_locked) erts_smp_runq_unlock(rq); } } } erts_smp_runq_lock(c_rq); } static ERTS_INLINE void suspend_run_queue(ErtsRunQueue *rq) { erts_smp_atomic32_read_bor_nob(&rq->scheduler->ssi->flags, ERTS_SSI_FLG_SUSPENDED); (void) ERTS_RUNQ_FLGS_SET(rq, ERTS_RUNQ_FLG_SUSPENDED); wake_scheduler(rq, 0); } static void scheduler_ix_resume_wake(Uint ix); static ERTS_INLINE void resume_run_queue(ErtsRunQueue *rq) { int pix; erts_smp_runq_lock(rq); (void) ERTS_RUNQ_FLGS_MASK_SET(rq, (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK | ERTS_RUNQ_FLG_SUSPENDED), (ERTS_RUNQ_FLG_OUT_OF_WORK | ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)); rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { rq->procs.prio_info[pix].max_len = 0; rq->procs.prio_info[pix].reds = 0; } rq->ports.info.max_len = 0; rq->ports.info.reds = 0; rq->max_len = 0; erts_smp_runq_unlock(rq); scheduler_ix_resume_wake(rq->ix); } typedef struct { Process *first; Process *last; } ErtsStuckBoundProcesses; static void schedule_bound_processes(ErtsRunQueue *rq, ErtsStuckBoundProcesses *sbpp) { Process *proc, *next; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); proc = sbpp->first; while (proc) { erts_aint32_t state = erts_smp_atomic32_read_acqb(&proc->state); next = proc->next; enqueue_process(rq, (int) (ERTS_PSFLG_PRIO_MASK & state), proc); proc = next; } } static void evacuate_run_queue(ErtsRunQueue *rq, ErtsStuckBoundProcesses *sbpp) { int prio_q; ErtsRunQueue *to_rq; ErtsMigrationPaths *mps; ErtsMigrationPath *mp; ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_PROTECTED); mps = erts_get_migration_paths_managed(); mp = &mps->mpath[rq->ix]; /* Evacuate scheduled misc ops */ if (rq->misc.start) { ErtsMiscOpList *start, *end; to_rq = mp->misc_evac_runq; if (!to_rq) return; start = rq->misc.start; end = rq->misc.end; rq->misc.start = NULL; rq->misc.end = NULL; erts_smp_runq_unlock(rq); erts_smp_runq_lock(to_rq); if (to_rq->misc.end) to_rq->misc.end->next = start; else to_rq->misc.start = start; to_rq->misc.end = end; erts_smp_runq_unlock(to_rq); smp_notify_inc_runq(to_rq); erts_smp_runq_lock(to_rq); } if (rq->ports.start) { Port *prt; to_rq = mp->prio[ERTS_PORT_PRIO_LEVEL].runq; if (!to_rq) return; /* Evacuate scheduled ports */ prt = rq->ports.start; while (prt) { ErtsRunQueue *prt_rq; prt = erts_dequeue_port(rq); RUNQ_SET_RQ(&prt->run_queue, to_rq); erts_smp_runq_unlock(rq); /* * The port might terminate while * we have no lock on it... */ prt_rq = erts_port_runq(prt); if (prt_rq) { if (prt_rq != to_rq) erl_exit(ERTS_ABORT_EXIT, "%s:%d:%s() internal error\n", __FILE__, __LINE__, __func__); erts_enqueue_port(to_rq, prt); erts_smp_runq_unlock(to_rq); } erts_smp_runq_lock(rq); prt = rq->ports.start; } smp_notify_inc_runq(to_rq); } /* Evacuate scheduled processes */ for (prio_q = 0; prio_q < ERTS_NO_PROC_PRIO_QUEUES; prio_q++) { erts_aint32_t state; Process *proc; int notify = 0; to_rq = NULL; if (!mp->prio[prio_q].runq) return; if (prio_q == PRIORITY_NORMAL && !mp->prio[PRIORITY_LOW].runq) return; proc = dequeue_process(rq, prio_q, &state); while (proc) { if (ERTS_PSFLG_BOUND & state) { /* Bound processes get stuck here... */ proc->next = NULL; if (sbpp->last) sbpp->last->next = proc; else sbpp->first = proc; sbpp->last = proc; } else { int prio = (int) (ERTS_PSFLG_PRIO_MASK & state); erts_smp_runq_unlock(rq); to_rq = mp->prio[prio].runq; RUNQ_SET_RQ(&proc->run_queue, to_rq); erts_smp_runq_lock(to_rq); enqueue_process(to_rq, prio, proc); erts_smp_runq_unlock(to_rq); notify = 1; erts_smp_runq_lock(rq); } proc = dequeue_process(rq, prio_q, &state); } if (notify) smp_notify_inc_runq(to_rq); } if (ERTS_EMPTY_RUNQ(rq)) empty_runq(rq); } static int try_steal_task_from_victim(ErtsRunQueue *rq, int *rq_lockedp, ErtsRunQueue *vrq, Uint32 flags) { Uint32 procs_qmask = flags & ERTS_RUNQ_FLGS_PROCS_QMASK; int max_prio_bit; ErtsRunPrioQueue *rpq; if (*rq_lockedp) { erts_smp_runq_unlock(rq); *rq_lockedp = 0; } ERTS_SMP_LC_ASSERT(!erts_smp_lc_runq_is_locked(rq)); erts_smp_runq_lock(vrq); if (rq->halt_in_progress) goto no_procs; /* * Check for a runnable process to steal... */ while (procs_qmask) { Process *prev_proc; Process *proc; max_prio_bit = procs_qmask & -procs_qmask; switch (max_prio_bit) { case MAX_BIT: rpq = &vrq->procs.prio[PRIORITY_MAX]; break; case HIGH_BIT: rpq = &vrq->procs.prio[PRIORITY_HIGH]; break; case NORMAL_BIT: case LOW_BIT: rpq = &vrq->procs.prio[PRIORITY_NORMAL]; break; case 0: goto no_procs; default: ASSERT(!"Invalid queue mask"); goto no_procs; } prev_proc = NULL; proc = rpq->first; while (proc) { erts_aint32_t state = erts_smp_atomic32_read_acqb(&proc->state); if (!(ERTS_PSFLG_BOUND & state)) { /* Steal process */ int prio = (int) (ERTS_PSFLG_PRIO_MASK & state); ErtsRunQueueInfo *rqi = &vrq->procs.prio_info[prio]; unqueue_process(vrq, rpq, rqi, prio, prev_proc, proc); erts_smp_runq_unlock(vrq); RUNQ_SET_RQ(&proc->run_queue, rq); erts_smp_runq_lock(rq); *rq_lockedp = 1; enqueue_process(rq, prio, proc); return !0; } prev_proc = proc; proc = proc->next; } procs_qmask &= ~max_prio_bit; } no_procs: ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(vrq)); /* * Check for a runnable port to steal... */ if (vrq->ports.start) { ErtsRunQueue *prt_rq; Port *prt = erts_dequeue_port(vrq); RUNQ_SET_RQ(&prt->run_queue, rq); erts_smp_runq_unlock(vrq); /* * The port might terminate while * we have no lock on it... */ prt_rq = erts_port_runq(prt); if (!prt_rq) return 0; else { if (prt_rq != rq) erl_exit(ERTS_ABORT_EXIT, "%s:%d:%s() internal error\n", __FILE__, __LINE__, __func__); *rq_lockedp = 1; erts_enqueue_port(rq, prt); return !0; } } erts_smp_runq_unlock(vrq); return 0; } static ERTS_INLINE int check_possible_steal_victim(ErtsRunQueue *rq, int *rq_lockedp, int vix) { ErtsRunQueue *vrq = ERTS_RUNQ_IX(vix); Uint32 flags = ERTS_RUNQ_FLGS_GET(vrq); if ((flags & (ERTS_RUNQ_FLG_NONEMPTY | ERTS_RUNQ_FLG_PROTECTED)) == ERTS_RUNQ_FLG_NONEMPTY) return try_steal_task_from_victim(rq, rq_lockedp, vrq, flags); else return 0; } static int try_steal_task(ErtsRunQueue *rq) { int res, rq_locked, vix, active_rqs, blnc_rqs; Uint32 flags; /* Protect jobs we steal from getting stolen from us... */ flags = ERTS_RUNQ_FLGS_SET(rq, ERTS_RUNQ_FLG_PROTECTED); if (flags & ERTS_RUNQ_FLG_SUSPENDED) return 0; /* go suspend instead... */ res = 0; rq_locked = 1; ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, rq_locked); get_no_runqs(&active_rqs, &blnc_rqs); if (active_rqs > blnc_rqs) active_rqs = blnc_rqs; if (rq->ix < active_rqs) { /* First try to steal from an inactive run queue... */ if (active_rqs < blnc_rqs) { int no = blnc_rqs - active_rqs; int stop_ix = vix = active_rqs + rq->ix % no; while (erts_smp_atomic32_read_acqb(&no_empty_run_queues) < blnc_rqs) { res = check_possible_steal_victim(rq, &rq_locked, vix); if (res) goto done; vix++; if (vix >= blnc_rqs) vix = active_rqs; if (vix == stop_ix) break; } } vix = rq->ix; /* ... then try to steal a job from another active queue... */ while (erts_smp_atomic32_read_acqb(&no_empty_run_queues) < blnc_rqs) { vix++; if (vix >= active_rqs) vix = 0; if (vix == rq->ix) break; res = check_possible_steal_victim(rq, &rq_locked, vix); if (res) goto done; } } done: if (!rq_locked) erts_smp_runq_lock(rq); if (!res) res = rq->halt_in_progress ? !ERTS_EMPTY_RUNQ_PORTS(rq) : !ERTS_EMPTY_RUNQ(rq); return res; } /* Run queue balancing */ typedef struct { Uint32 flags; struct { int max_len; int avail; int reds; int migration_limit; int emigrate_to; int immigrate_from; } prio[ERTS_NO_PRIO_LEVELS]; int reds; int full_reds; int full_reds_history_sum; int full_reds_history_change; int oowc; int max_len; } ErtsRunQueueBalance; static ErtsRunQueueBalance *run_queue_info; typedef struct { int qix; int len; } ErtsRunQueueCompare; static ErtsRunQueueCompare *run_queue_compare; static int rqc_len_cmp(const void *x, const void *y) { return ((ErtsRunQueueCompare *) x)->len - ((ErtsRunQueueCompare *) y)->len; } #define ERTS_PERCENT(X, Y) \ ((Y) == 0 \ ? ((X) == 0 ? 100 : INT_MAX) \ : ((100*(X))/(Y))) #define ERTS_UPDATE_FULL_REDS(QIX, LAST_REDS) \ do { \ run_queue_info[(QIX)].full_reds \ = run_queue_info[(QIX)].full_reds_history_sum; \ run_queue_info[(QIX)].full_reds += (LAST_REDS); \ run_queue_info[(QIX)].full_reds \ >>= ERTS_FULL_REDS_HISTORY_AVG_SHFT; \ run_queue_info[(QIX)].full_reds_history_sum \ -= run_queue_info[(QIX)].full_reds_history_change; \ run_queue_info[(QIX)].full_reds_history_sum += (LAST_REDS); \ run_queue_info[(QIX)].full_reds_history_change = (LAST_REDS); \ } while (0) #define ERTS_DBG_CHK_FULL_REDS_HISTORY(RQ) \ do { \ int sum__ = 0; \ int rix__; \ for (rix__ = 0; rix__ < ERTS_FULL_REDS_HISTORY_SIZE; rix__++) \ sum__ += (RQ)->full_reds_history[rix__]; \ ASSERT(sum__ == (RQ)->full_reds_history_sum); \ } while (0); #define ERTS_PRE_ALLOCED_MPATHS 8 erts_atomic_t erts_migration_paths; static struct { size_t size; ErtsMigrationPaths *freelist; struct { ErtsMigrationPaths *first; ErtsMigrationPaths *last; } retired; } mpaths; static void init_migration_paths(void) { int qix, i; char *p; ErtsMigrationPaths *mps; mpaths.size = sizeof(ErtsMigrationPaths); mpaths.size += sizeof(ErtsMigrationPath)*(erts_no_schedulers-1); mpaths.size = ERTS_ALC_CACHE_LINE_ALIGN_SIZE(mpaths.size); p = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_LL_MPATHS, (mpaths.size * ERTS_PRE_ALLOCED_MPATHS)); mpaths.freelist = NULL; for (i = 0; i < ERTS_PRE_ALLOCED_MPATHS-1; i++) { mps = (ErtsMigrationPaths *) p; mps->next = mpaths.freelist; mpaths.freelist = mps; p += mpaths.size; } mps = (ErtsMigrationPaths *) p; mps->block = NULL; for (qix = 0; qix < erts_no_run_queues; qix++) { int pix; mps->mpath[qix].flags = 0; mps->mpath[qix].misc_evac_runq = NULL; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { mps->mpath[qix].prio[pix].limit.this = -1; mps->mpath[qix].prio[pix].limit.other = -1; mps->mpath[qix].prio[pix].runq = NULL; mps->mpath[qix].prio[pix].flags = 0; } } erts_atomic_init_wb(&erts_migration_paths, (erts_aint_t) mps); } static ERTS_INLINE ErtsMigrationPaths * alloc_mpaths(void) { void *block; ErtsMigrationPaths *res; ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&balance_info.update_mtx)); res = mpaths.freelist; if (res) { mpaths.freelist = res->next; res->block = NULL; return res; } res = erts_alloc(ERTS_ALC_T_SL_MPATHS, mpaths.size+ERTS_CACHE_LINE_SIZE); block = (void *) res; if (((UWord) res) & ERTS_CACHE_LINE_MASK) res = (ErtsMigrationPaths *) ((((UWord) res) & ~ERTS_CACHE_LINE_MASK) + ERTS_CACHE_LINE_SIZE); res->block = block; return res; } static ERTS_INLINE void retire_mpaths(ErtsMigrationPaths *mps) { ErtsThrPrgrVal current; ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&balance_info.update_mtx)); current = erts_thr_progress_current(); while (mpaths.retired.first) { ErtsMigrationPaths *tmp = mpaths.retired.first; if (!erts_thr_progress_has_reached_this(current, tmp->thr_prgr)) break; mpaths.retired.first = tmp->next; if (tmp->block) { erts_free(ERTS_ALC_T_SL_MPATHS, tmp->block); } else { tmp->next = mpaths.freelist; mpaths.freelist = tmp; } } if (!mpaths.retired.first) mpaths.retired.last = NULL; mps->thr_prgr = erts_thr_progress_later(NULL); mps->next = NULL; if (mpaths.retired.last) mpaths.retired.last->next = mps; else mpaths.retired.first = mps; mpaths.retired.last = mps; } static void check_balance(ErtsRunQueue *c_rq) { #if ERTS_MAX_PROCESSES >= (1 << 27) # error check_balance() assumes ERTS_MAX_PROCESS < (1 << 27) #endif ErtsMigrationPaths *new_mpaths, *old_mpaths; ErtsRunQueueBalance avg = {0}; Sint64 scheds_reds, full_scheds_reds; int forced, active, current_active, oowc, half_full_scheds, full_scheds, mmax_len, blnc_no_rqs, qix, pix, freds_hist_ix; if (erts_smp_atomic32_xchg_nob(&balance_info.checking_balance, 1)) { c_rq->check_balance_reds = INT_MAX; return; } get_no_runqs(NULL, &blnc_no_rqs); if (blnc_no_rqs == 1) { c_rq->check_balance_reds = INT_MAX; erts_smp_atomic32_set_nob(&balance_info.checking_balance, 0); return; } erts_smp_runq_unlock(c_rq); if (balance_info.halftime) { balance_info.halftime = 0; erts_smp_atomic32_set_nob(&balance_info.checking_balance, 0); ERTS_FOREACH_RUNQ(rq, { if (rq->waiting) (void) ERTS_RUNQ_FLGS_SET(rq, ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK); else (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK); rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; }); erts_smp_runq_lock(c_rq); return; } /* * check_balance() is never called in more threads * than one at a time, i.e., we will normally never * get any conflicts on the balance_info.update_mtx. * However, when blocking multi scheduling (which performance * critical applications do *not* do) migration information * is manipulated. Such updates of the migration information * might clash with balancing. */ erts_smp_mtx_lock(&balance_info.update_mtx); forced = balance_info.forced_check_balance; balance_info.forced_check_balance = 0; get_no_runqs(¤t_active, &blnc_no_rqs); if (blnc_no_rqs == 1) { erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_runq_lock(c_rq); c_rq->check_balance_reds = INT_MAX; erts_smp_atomic32_set_nob(&balance_info.checking_balance, 0); return; } freds_hist_ix = balance_info.full_reds_history_index; balance_info.full_reds_history_index++; if (balance_info.full_reds_history_index >= ERTS_FULL_REDS_HISTORY_SIZE) balance_info.full_reds_history_index = 0; /* Read balance information for all run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(qix); erts_smp_runq_lock(rq); run_queue_info[qix].flags = ERTS_RUNQ_FLGS_GET_NOB(rq); for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].max_len = rq->procs.prio_info[pix].max_len; run_queue_info[qix].prio[pix].reds = rq->procs.prio_info[pix].reds; } run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].max_len = rq->ports.info.max_len; run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].reds = rq->ports.info.reds; run_queue_info[qix].full_reds_history_sum = rq->full_reds_history_sum; run_queue_info[qix].full_reds_history_change = rq->full_reds_history[freds_hist_ix]; run_queue_info[qix].oowc = rq->out_of_work_count; run_queue_info[qix].max_len = rq->max_len; rq->check_balance_reds = INT_MAX; erts_smp_runq_unlock(rq); } full_scheds = 0; half_full_scheds = 0; full_scheds_reds = 0; scheds_reds = 0; oowc = 0; mmax_len = 0; /* Calculate availability for each priority in each run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { int treds = 0; if (run_queue_info[qix].flags & ERTS_RUNQ_FLG_OUT_OF_WORK) { for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].avail = 100; treds += run_queue_info[qix].prio[pix].reds; } if (!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)) half_full_scheds++; ERTS_UPDATE_FULL_REDS(qix, ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED); } else { ASSERT(!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK)); for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) treds += run_queue_info[qix].prio[pix].reds; if (treds == 0) { for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) run_queue_info[qix].prio[pix].avail = 0; } else { Sint64 xreds = 0; Sint64 procreds = treds; procreds -= ((Sint64) run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].reds); for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { Sint64 av; if (xreds == 0) av = 100; else if (procreds == xreds) av = 0; else { av = (100*(procreds - xreds)) / procreds; if (av == 0) av = 1; } run_queue_info[qix].prio[pix].avail = (int) av; ASSERT(run_queue_info[qix].prio[pix].avail >= 0); if (pix < PRIORITY_NORMAL) /* ie., max or high */ xreds += (Sint64) run_queue_info[qix].prio[pix].reds; } run_queue_info[qix].prio[ERTS_PORT_PRIO_LEVEL].avail = 100; } ERTS_UPDATE_FULL_REDS(qix, treds); full_scheds_reds += run_queue_info[qix].full_reds; full_scheds++; half_full_scheds++; } run_queue_info[qix].reds = treds; scheds_reds += treds; oowc += run_queue_info[qix].oowc; if (mmax_len < run_queue_info[qix].max_len) mmax_len = run_queue_info[qix].max_len; } if (!erts_sched_compact_load) goto all_active; if (!forced && half_full_scheds != blnc_no_rqs) { int min = 1; if (min < half_full_scheds) min = half_full_scheds; if (full_scheds) { active = (scheds_reds - 1)/ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED+1; } else { active = balance_info.last_active_runqs - 1; } if (balance_info.last_active_runqs < current_active) { ERTS_BLNCE_SAVE_RISE(current_active, mmax_len, scheds_reds); active = current_active; } else if (active < balance_info.prev_rise.active_runqs) { if (ERTS_PERCENT(mmax_len, balance_info.prev_rise.max_len) >= 90 && ERTS_PERCENT(scheds_reds, balance_info.prev_rise.reds) >= 90) { active = balance_info.prev_rise.active_runqs; } } if (active < min) active = min; else if (active > blnc_no_rqs) active = blnc_no_rqs; if (active == blnc_no_rqs) goto all_active; for (qix = 0; qix < active; qix++) { run_queue_info[qix].flags = 0; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].emigrate_to = -1; run_queue_info[qix].prio[pix].immigrate_from = -1; run_queue_info[qix].prio[pix].migration_limit = 0; } } for (qix = active; qix < blnc_no_rqs; qix++) { run_queue_info[qix].flags = ERTS_RUNQ_FLG_INACTIVE; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int tix = qix % active; ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[qix].flags, pix); run_queue_info[qix].prio[pix].emigrate_to = tix; run_queue_info[qix].prio[pix].immigrate_from = -1; run_queue_info[qix].prio[pix].migration_limit = 0; } } } else { if (balance_info.last_active_runqs < current_active) ERTS_BLNCE_SAVE_RISE(current_active, mmax_len, scheds_reds); all_active: active = blnc_no_rqs; for (qix = 0; qix < blnc_no_rqs; qix++) { if (full_scheds_reds > 0) { /* Calculate availability compared to other schedulers */ if (!(run_queue_info[qix].flags & ERTS_RUNQ_FLG_OUT_OF_WORK)) { Sint64 tmp = ((Sint64) run_queue_info[qix].full_reds * (Sint64) full_scheds); for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { Sint64 avail = run_queue_info[qix].prio[pix].avail; avail = (avail*tmp)/full_scheds_reds; ASSERT(avail >= 0); run_queue_info[qix].prio[pix].avail = (int) avail; } } } /* Calculate average max length */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { run_queue_info[qix].prio[pix].emigrate_to = -1; run_queue_info[qix].prio[pix].immigrate_from = -1; avg.prio[pix].max_len += run_queue_info[qix].prio[pix].max_len; avg.prio[pix].avail += run_queue_info[qix].prio[pix].avail; } } for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int max_len = avg.prio[pix].max_len; if (max_len != 0) { int avail = avg.prio[pix].avail; if (avail != 0) { max_len = (int) ((100*((Sint64) max_len) - 1) / ((Sint64) avail)) + 1; avg.prio[pix].max_len = max_len; ASSERT(max_len >= 0); } } } /* Calculate migration limits for all priority queues in all run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { run_queue_info[qix].flags = 0; /* Reset for later use... */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int limit; if (avg.prio[pix].max_len == 0 || run_queue_info[qix].prio[pix].avail == 0) limit = 0; else limit = (int) (((((Sint64) avg.prio[pix].max_len) * ((Sint64) run_queue_info[qix].prio[pix].avail)) - 1) / 100 + 1); run_queue_info[qix].prio[pix].migration_limit = limit; } } /* Setup migration paths for all priorities */ for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { int low = 0, high = 0; for (qix = 0; qix < blnc_no_rqs; qix++) { int len_diff = run_queue_info[qix].prio[pix].max_len; len_diff -= run_queue_info[qix].prio[pix].migration_limit; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d ", len_diff); #endif run_queue_compare[qix].qix = qix; run_queue_compare[qix].len = len_diff; if (len_diff != 0) { if (len_diff < 0) low++; else high++; } } #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "\n"); #endif if (low && high) { int from_qix; int to_qix; int eof = 0; int eot = 0; int tix = 0; int fix = blnc_no_rqs-1; qsort(run_queue_compare, blnc_no_rqs, sizeof(ErtsRunQueueCompare), rqc_len_cmp); while (1) { if (run_queue_compare[fix].len <= 0) eof = 1; if (run_queue_compare[tix].len >= 0) eot = 1; if (eof || eot) break; from_qix = run_queue_compare[fix].qix; to_qix = run_queue_compare[tix].qix; if (run_queue_info[from_qix].prio[pix].avail == 0) { ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[to_qix].flags, pix); } ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_IMMIGRATE(run_queue_info[to_qix].flags, pix); run_queue_info[from_qix].prio[pix].emigrate_to = to_qix; run_queue_info[to_qix].prio[pix].immigrate_from = from_qix; tix++; fix--; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d >--> %d\n", from_qix, to_qix); #endif } if (!eot && eof) { if (fix < blnc_no_rqs-1) fix++; if (run_queue_compare[fix].len > 0) { int fix2 = -1; while (tix < fix) { if (run_queue_compare[tix].len >= 0) break; if (fix2 < fix) fix2 = blnc_no_rqs-1; from_qix = run_queue_compare[fix2].qix; to_qix = run_queue_compare[tix].qix; ASSERT(to_qix != from_qix); if (run_queue_info[from_qix].prio[pix].avail == 0) ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[to_qix].flags, pix); ERTS_SET_RUNQ_FLG_IMMIGRATE(run_queue_info[to_qix].flags, pix); run_queue_info[to_qix].prio[pix].immigrate_from = from_qix; tix++; fix2--; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d --> %d\n", from_qix, to_qix); #endif } } } else if (!eof && eot) { if (tix > 0) tix--; if (run_queue_compare[tix].len < 0) { int tix2 = 0; while (tix < fix) { if (run_queue_compare[fix].len <= 0) break; if (tix2 > tix) tix2 = 0; from_qix = run_queue_compare[fix].qix; to_qix = run_queue_compare[tix2].qix; ASSERT(to_qix != from_qix); if (run_queue_info[from_qix].prio[pix].avail == 0) ERTS_SET_RUNQ_FLG_EVACUATE(run_queue_info[from_qix].flags, pix); ERTS_SET_RUNQ_FLG_EMIGRATE(run_queue_info[from_qix].flags, pix); run_queue_info[from_qix].prio[pix].emigrate_to = to_qix; fix--; tix2++; #ifdef DBG_PRINT if (pix == 2) erts_fprintf(stderr, "%d >-- %d\n", from_qix, to_qix); #endif } } } } } #ifdef DBG_PRINT erts_fprintf(stderr, "--------------------------------\n"); #endif } balance_info.last_active_runqs = active; set_no_active_runqs(active); balance_info.halftime = 1; new_mpaths = alloc_mpaths(); /* Write migration paths */ for (qix = 0; qix < blnc_no_rqs; qix++) { int mqix; Uint32 flags = run_queue_info[qix].flags; ErtsMigrationPath *mp = &new_mpaths->mpath[qix]; mp->flags = flags; mp->misc_evac_runq = NULL; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { if (!(ERTS_CHK_RUNQ_FLG_EMIGRATE(flags, pix) | ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix))) { ASSERT(run_queue_info[qix].prio[pix].immigrate_from < 0); ASSERT(run_queue_info[qix].prio[pix].emigrate_to < 0); mp->prio[pix].limit.this = -1; mp->prio[pix].limit.other = -1; mp->prio[pix].runq = NULL; mp->prio[pix].flags = 0; } else if (ERTS_CHK_RUNQ_FLG_EMIGRATE(flags, pix)) { ASSERT(!ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix)); ASSERT(run_queue_info[qix].prio[pix].immigrate_from < 0); ASSERT(run_queue_info[qix].prio[pix].emigrate_to >= 0); mqix = run_queue_info[qix].prio[pix].emigrate_to; mp->prio[pix].limit.this = run_queue_info[qix].prio[pix].migration_limit; mp->prio[pix].limit.other = run_queue_info[mqix].prio[pix].migration_limit; mp->prio[pix].runq = ERTS_RUNQ_IX(mqix); mp->prio[pix].flags = run_queue_info[mqix].flags; } else { ASSERT(ERTS_CHK_RUNQ_FLG_IMMIGRATE(flags, pix)); ASSERT(run_queue_info[qix].prio[pix].emigrate_to < 0); ASSERT(run_queue_info[qix].prio[pix].immigrate_from >= 0); mqix = run_queue_info[qix].prio[pix].immigrate_from; mp->prio[pix].limit.this = run_queue_info[qix].prio[pix].migration_limit; mp->prio[pix].limit.other = run_queue_info[mqix].prio[pix].migration_limit; mp->prio[pix].runq = ERTS_RUNQ_IX(mqix); mp->prio[pix].flags = run_queue_info[mqix].flags; } } } old_mpaths = erts_get_migration_paths_managed(); /* Keep offline run-queues as is */ for (qix = blnc_no_rqs; qix < erts_no_schedulers; qix++) { ErtsMigrationPath *nmp = &new_mpaths->mpath[qix]; ErtsMigrationPath *omp = &old_mpaths->mpath[qix]; nmp->flags = omp->flags; nmp->misc_evac_runq = omp->misc_evac_runq; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { nmp->prio[pix].limit.this = omp->prio[pix].limit.this; nmp->prio[pix].limit.other = omp->prio[pix].limit.other; nmp->prio[pix].runq = omp->prio[pix].runq; nmp->prio[pix].flags = omp->prio[pix].flags; } } /* Publish new migration paths... */ erts_atomic_set_wb(&erts_migration_paths, (erts_aint_t) new_mpaths); /* Reset balance statistics in all online queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { Uint32 flags = run_queue_info[qix].flags; ErtsRunQueue *rq = ERTS_RUNQ_IX(qix); erts_smp_runq_lock(rq); ASSERT(!(flags & ERTS_RUNQ_FLG_OUT_OF_WORK)); if (rq->waiting) flags |= ERTS_RUNQ_FLG_OUT_OF_WORK; rq->full_reds_history_sum = run_queue_info[qix].full_reds_history_sum; rq->full_reds_history[freds_hist_ix] = run_queue_info[qix].full_reds_history_change; ERTS_DBG_CHK_FULL_REDS_HISTORY(rq); rq->out_of_work_count = 0; (void) ERTS_RUNQ_FLGS_MASK_SET(rq, ERTS_RUNQ_FLGS_MIGRATION_INFO, flags); rq->max_len = rq->len; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { ErtsRunQueueInfo *rqi; rqi = (pix == ERTS_PORT_PRIO_LEVEL ? &rq->ports.info : &rq->procs.prio_info[pix]); erts_smp_reset_max_len(rq, rqi); rqi->reds = 0; } rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; erts_smp_runq_unlock(rq); } erts_smp_atomic32_set_nob(&balance_info.checking_balance, 0); balance_info.n++; retire_mpaths(old_mpaths); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_runq_lock(c_rq); } static void change_no_used_runqs(int used) { ErtsMigrationPaths *new_mpaths, *old_mpaths; int active, qix; erts_smp_mtx_lock(&balance_info.update_mtx); get_no_runqs(&active, NULL); set_no_used_runqs(used); old_mpaths = erts_get_migration_paths_managed(); new_mpaths = alloc_mpaths(); /* Write migration paths... */ for (qix = 0; qix < used; qix++) { int pix; ErtsMigrationPath *omp = &old_mpaths->mpath[qix]; ErtsMigrationPath *nmp = &new_mpaths->mpath[qix]; nmp->flags = omp->flags & ~ERTS_RUNQ_FLGS_MIGRATION_QMASKS; nmp->misc_evac_runq = NULL; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { nmp->prio[pix].limit.this = -1; nmp->prio[pix].limit.other = -1; nmp->prio[pix].runq = NULL; nmp->prio[pix].flags = 0; } } for (qix = used; qix < erts_no_run_queues; qix++) { int pix; ErtsRunQueue *to_rq = ERTS_RUNQ_IX(qix % used); ErtsMigrationPath *nmp = &new_mpaths->mpath[qix]; nmp->flags = (ERTS_RUNQ_FLGS_EMIGRATE_QMASK | ERTS_RUNQ_FLGS_EVACUATE_QMASK); nmp->misc_evac_runq = to_rq; for (pix = 0; pix < ERTS_NO_PRIO_LEVELS; pix++) { nmp->prio[pix].limit.this = -1; nmp->prio[pix].limit.other = -1; nmp->prio[pix].runq = to_rq; nmp->prio[pix].flags = 0; } } /* ... and publish them. */ erts_atomic_set_wb(&erts_migration_paths, (erts_aint_t) new_mpaths); retire_mpaths(old_mpaths); /* Make sure that we balance soon... */ balance_info.forced_check_balance = 1; erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_runq_lock(ERTS_RUNQ_IX(0)); ERTS_RUNQ_IX(0)->check_balance_reds = 0; erts_smp_runq_unlock(ERTS_RUNQ_IX(0)); } #endif /* #ifdef ERTS_SMP */ Uint erts_debug_nbalance(void) { #ifdef ERTS_SMP Uint n; erts_smp_mtx_lock(&balance_info.update_mtx); n = balance_info.n; erts_smp_mtx_unlock(&balance_info.update_mtx); return n; #else return 0; #endif } /* Wakeup other schedulers */ typedef enum { ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH, ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH, ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM, ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW, ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW } ErtsSchedWakeupOtherThreshold; typedef enum { ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL, ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY } ErtsSchedWakeupOtherType; /* First proposal */ #define ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH (200*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_HIGH (50*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_MEDIUM (10*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_LOW (CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW (CONTEXT_REDS/10) #define ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_HIGH 3 #define ERTS_WAKEUP_OTHER_DEC_SHIFT_HIGH 1 #define ERTS_WAKEUP_OTHER_DEC_SHIFT_MEDIUM 0 #define ERTS_WAKEUP_OTHER_DEC_SHIFT_LOW -2 #define ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_LOW -5 #define ERTS_WAKEUP_OTHER_DEC_SHIFT 2 #define ERTS_WAKEUP_OTHER_FIXED_INC (CONTEXT_REDS/10) /* To be legacy */ #define ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH_LEGACY (200*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_HIGH_LEGACY (50*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_MEDIUM_LEGACY (10*CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_LOW_LEGACY (CONTEXT_REDS) #define ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW_LEGACY (CONTEXT_REDS/10) #define ERTS_WAKEUP_OTHER_DEC_LEGACY 10 #define ERTS_WAKEUP_OTHER_FIXED_INC_LEGACY (CONTEXT_REDS/10) #ifdef ERTS_SMP static struct { ErtsSchedWakeupOtherThreshold threshold; ErtsSchedWakeupOtherType type; int limit; int dec_shift; int dec_mask; void (*check)(ErtsRunQueue *rq, Uint32 flags); } wakeup_other; static void wakeup_other_check(ErtsRunQueue *rq, Uint32 flags) { int wo_reds = rq->wakeup_other_reds; if (wo_reds) { int left_len = rq->len - 1; if (left_len < 1) { int wo_reduce = wo_reds << wakeup_other.dec_shift; wo_reduce &= wakeup_other.dec_mask; rq->wakeup_other -= wo_reduce; if (rq->wakeup_other < 0) rq->wakeup_other = 0; } else { rq->wakeup_other += (left_len*wo_reds + ERTS_WAKEUP_OTHER_FIXED_INC); if (rq->wakeup_other > wakeup_other.limit) { int empty_rqs = erts_smp_atomic32_read_acqb(&no_empty_run_queues); if (flags & ERTS_RUNQ_FLG_PROTECTED) (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_PROTECTED); if (empty_rqs != 0) wake_scheduler_on_empty_runq(rq); rq->wakeup_other = 0; } } rq->wakeup_other_reds = 0; } } static void wakeup_other_set_limit(void) { switch (wakeup_other.threshold) { case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH; wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_HIGH; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH; wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_HIGH; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM; wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_MEDIUM; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_LOW; wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_LOW; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW; wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_LOW; break; } if (wakeup_other.dec_shift < 0) wakeup_other.dec_mask = (1 << (sizeof(wakeup_other.dec_mask)*8 + wakeup_other.dec_shift)) - 1; else { wakeup_other.dec_mask = 0; wakeup_other.dec_mask = ~wakeup_other.dec_mask; } } static void wakeup_other_check_legacy(ErtsRunQueue *rq, Uint32 flags) { int wo_reds = rq->wakeup_other_reds; if (wo_reds) { erts_aint32_t len = rq->len; if (len < 2) { rq->wakeup_other -= ERTS_WAKEUP_OTHER_DEC_LEGACY*wo_reds; if (rq->wakeup_other < 0) rq->wakeup_other = 0; } else if (rq->wakeup_other < wakeup_other.limit) rq->wakeup_other += len*wo_reds + ERTS_WAKEUP_OTHER_FIXED_INC_LEGACY; else { if (flags & ERTS_RUNQ_FLG_PROTECTED) (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_PROTECTED); if (erts_smp_atomic32_read_acqb(&no_empty_run_queues) != 0) { wake_scheduler_on_empty_runq(rq); rq->wakeup_other = 0; } rq->wakeup_other = 0; } } rq->wakeup_other_reds = 0; } static void wakeup_other_set_limit_legacy(void) { switch (wakeup_other.threshold) { case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH_LEGACY; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH_LEGACY; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM_LEGACY; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_LOW_LEGACY; break; case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW: wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW_LEGACY; break; } } static void set_wakeup_other_data(void) { switch (wakeup_other.type) { case ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL: wakeup_other.check = wakeup_other_check; wakeup_other_set_limit(); break; case ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY: wakeup_other.check = wakeup_other_check_legacy; wakeup_other_set_limit_legacy(); break; } } #endif void erts_early_init_scheduling(int no_schedulers) { aux_work_timeout_early_init(no_schedulers); #ifdef ERTS_SMP wakeup_other.threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM; wakeup_other.type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY; #endif sched_busy_wait.sys_schedule = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM; sched_busy_wait.tse = (ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM * ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT); sched_busy_wait.aux_work = (ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM * ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM); } int erts_sched_set_wakeup_other_thresold(char *str) { ErtsSchedWakeupOtherThreshold threshold; if (sys_strcmp(str, "very_high") == 0) threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH; else if (sys_strcmp(str, "high") == 0) threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH; else if (sys_strcmp(str, "medium") == 0) threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM; else if (sys_strcmp(str, "low") == 0) threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW; else if (sys_strcmp(str, "very_low") == 0) threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW; else return EINVAL; #ifdef ERTS_SMP wakeup_other.threshold = threshold; set_wakeup_other_data(); #endif return 0; } int erts_sched_set_wakeup_other_type(char *str) { ErtsSchedWakeupOtherType type; if (sys_strcmp(str, "proposal") == 0) type = ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL; else if (sys_strcmp(str, "default") == 0) type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY; else if (sys_strcmp(str, "legacy") == 0) type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY; else return EINVAL; #ifdef ERTS_SMP wakeup_other.type = type; #endif return 0; } int erts_sched_set_busy_wait_threshold(char *str) { int sys_sched; int aux_work_fact; if (sys_strcmp(str, "very_long") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_LONG; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_LONG; } else if (sys_strcmp(str, "long") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_LONG; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_LONG; } else if (sys_strcmp(str, "medium") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM; } else if (sys_strcmp(str, "short") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_SHORT; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_SHORT; } else if (sys_strcmp(str, "very_short") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_SHORT; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_SHORT; } else if (sys_strcmp(str, "none") == 0) { sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_NONE; aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_NONE; } else { return EINVAL; } sched_busy_wait.sys_schedule = sys_sched; sched_busy_wait.tse = sys_sched*ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT; sched_busy_wait.aux_work = sys_sched*aux_work_fact; return 0; } static void init_aux_work_data(ErtsAuxWorkData *awdp, ErtsSchedulerData *esdp, char *dawwp) { awdp->sched_id = esdp ? (int) esdp->no : 0; awdp->esdp = esdp; awdp->ssi = esdp ? esdp->ssi : NULL; #ifdef ERTS_SMP awdp->misc.thr_prgr = ERTS_THR_PRGR_VAL_WAITING; awdp->dd.thr_prgr = ERTS_THR_PRGR_VAL_WAITING; awdp->dd.completed_callback = NULL; awdp->dd.completed_arg = NULL; awdp->later_op.first = NULL; awdp->later_op.last = NULL; #endif #ifdef ERTS_USE_ASYNC_READY_Q #ifdef ERTS_SMP awdp->async_ready.need_thr_prgr = 0; awdp->async_ready.thr_prgr = ERTS_THR_PRGR_VAL_WAITING; #endif awdp->async_ready.queue = NULL; #endif #ifdef ERTS_SMP if (!dawwp) { awdp->delayed_wakeup.job = NULL; awdp->delayed_wakeup.sched2jix = NULL; awdp->delayed_wakeup.jix = -1; } else { int i; awdp->delayed_wakeup.job = (ErtsDelayedAuxWorkWakeupJob *) dawwp; dawwp += sizeof(ErtsDelayedAuxWorkWakeupJob)*(erts_no_schedulers+1); awdp->delayed_wakeup.sched2jix = (int *) dawwp; awdp->delayed_wakeup.jix = -1; for (i = 0; i <= erts_no_schedulers; i++) awdp->delayed_wakeup.sched2jix[i] = -1; } #endif } void erts_init_scheduling(int no_schedulers, int no_schedulers_online) { int ix, n, no_ssi; char *daww_ptr; #ifdef ERTS_SMP size_t daww_sz; #endif init_misc_op_list_alloc(); #ifdef ERTS_SMP set_wakeup_other_data(); #endif ASSERT(no_schedulers_online <= no_schedulers); ASSERT(no_schedulers_online >= 1); ASSERT(no_schedulers >= 1); /* Create and initialize run queues */ n = no_schedulers; erts_aligned_run_queues = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_RUNQS, sizeof(ErtsAlignedRunQueue) * n); #ifdef ERTS_SMP erts_smp_atomic32_init_nob(&no_empty_run_queues, 0); #endif erts_no_run_queues = n; for (ix = 0; ix < n; ix++) { int pix, rix; ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); rq->ix = ix; /* make sure that the "extra" id correponds to the schedulers * id if the esdp->no <-> ix+1 mapping change. */ erts_smp_mtx_init_x(&rq->mtx, "run_queue", make_small(ix + 1)); erts_smp_cnd_init(&rq->cnd); rq->waiting = 0; rq->woken = 0; ERTS_RUNQ_FLGS_INIT(rq, ERTS_RUNQ_FLG_NONEMPTY); rq->check_balance_reds = ERTS_RUNQ_CALL_CHECK_BALANCE_REDS; rq->full_reds_history_sum = 0; for (rix = 0; rix < ERTS_FULL_REDS_HISTORY_SIZE; rix++) { rq->full_reds_history_sum += ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED; rq->full_reds_history[rix] = ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED; } rq->out_of_work_count = 0; rq->max_len = 0; rq->len = 0; rq->wakeup_other = 0; rq->wakeup_other_reds = 0; rq->halt_in_progress = 0; rq->procs.pending_exiters = NULL; rq->procs.context_switches = 0; rq->procs.reductions = 0; for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) { erts_smp_atomic32_init_nob(&rq->procs.prio_info[pix].len, 0); rq->procs.prio_info[pix].max_len = 0; rq->procs.prio_info[pix].reds = 0; if (pix < ERTS_NO_PROC_PRIO_LEVELS - 1) { rq->procs.prio[pix].first = NULL; rq->procs.prio[pix].last = NULL; } } rq->misc.start = NULL; rq->misc.end = NULL; erts_smp_atomic32_init_nob(&rq->ports.info.len, 0); rq->ports.info.max_len = 0; rq->ports.info.reds = 0; rq->ports.start = NULL; rq->ports.end = NULL; } #ifdef ERTS_SMP if (erts_no_run_queues != 1) { run_queue_info = erts_alloc(ERTS_ALC_T_RUNQ_BLNS, (sizeof(ErtsRunQueueBalance) * erts_no_run_queues)); run_queue_compare = erts_alloc(ERTS_ALC_T_RUNQ_BLNS, (sizeof(ErtsRunQueueCompare) * erts_no_run_queues)); } #endif n = (int) no_schedulers; erts_no_schedulers = n; /* Create and initialize scheduler sleep info */ #ifdef ERTS_SMP no_ssi = n+1; #else no_ssi = 1; #endif aligned_sched_sleep_info = erts_alloc_permanent_cache_aligned( ERTS_ALC_T_SCHDLR_SLP_INFO, no_ssi*sizeof(ErtsAlignedSchedulerSleepInfo)); for (ix = 0; ix < no_ssi; ix++) { ErtsSchedulerSleepInfo *ssi = &aligned_sched_sleep_info[ix].ssi; #ifdef ERTS_SMP #if 0 /* no need to initialize these... */ ssi->next = NULL; ssi->prev = NULL; #endif erts_smp_atomic32_init_nob(&ssi->flags, 0); ssi->event = NULL; /* initialized in sched_thread_func */ #endif erts_atomic32_init_nob(&ssi->aux_work, 0); } #ifdef ERTS_SMP aligned_sched_sleep_info++; #endif /* Create and initialize scheduler specific data */ #ifdef ERTS_SMP daww_sz = ERTS_ALC_CACHE_LINE_ALIGN_SIZE((sizeof(ErtsDelayedAuxWorkWakeupJob) + sizeof(int))*(n+1)); daww_ptr = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_SCHDLR_DATA, daww_sz*n); #else daww_ptr = NULL; #endif erts_aligned_scheduler_data = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_SCHDLR_DATA, n*sizeof(ErtsAlignedSchedulerData)); for (ix = 0; ix < n; ix++) { ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(ix); #ifdef ERTS_SMP erts_bits_init_state(&esdp->erl_bits_state); esdp->match_pseudo_process = NULL; esdp->free_process = NULL; #endif esdp->x_reg_array = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_BEAM_REGISTER, ERTS_X_REGS_ALLOCATED * sizeof(Eterm)); esdp->f_reg_array = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_BEAM_REGISTER, MAX_REG * sizeof(FloatDef)); #if !HEAP_ON_C_STACK esdp->num_tmp_heap_used = 0; #endif esdp->no = (Uint) ix+1; esdp->ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); esdp->current_process = NULL; esdp->current_port = NULL; esdp->virtual_reds = 0; esdp->cpu_id = -1; erts_init_atom_cache_map(&esdp->atom_cache_map); esdp->run_queue = ERTS_RUNQ_IX(ix); esdp->run_queue->scheduler = esdp; init_aux_work_data(&esdp->aux_work_data, esdp, daww_ptr); #ifdef ERTS_SMP daww_ptr += daww_sz; #endif init_sched_wall_time(&esdp->sched_wall_time); } init_misc_aux_work(); #if !HALFWORD_HEAP init_swtreq_alloc(); #endif #ifdef ERTS_SMP erts_atomic32_init_nob(&completed_dealloc_count, 0); /* debug only */ aux_thread_aux_work_data = erts_alloc_permanent_cache_aligned(ERTS_ALC_T_SCHDLR_DATA, sizeof(ErtsAuxWorkData)); erts_smp_mtx_init(&schdlr_sspnd.mtx, "schdlr_sspnd"); erts_smp_cnd_init(&schdlr_sspnd.cnd); erts_smp_atomic32_init_nob(&schdlr_sspnd.changing, 0); schdlr_sspnd.online = no_schedulers_online; schdlr_sspnd.curr_online = no_schedulers; schdlr_sspnd.msb.ongoing = 0; erts_smp_atomic32_init_nob(&schdlr_sspnd.active, no_schedulers); schdlr_sspnd.msb.procs = NULL; init_no_runqs(no_schedulers, no_schedulers_online); balance_info.last_active_runqs = no_schedulers; erts_smp_mtx_init(&balance_info.update_mtx, "migration_info_update"); balance_info.forced_check_balance = 0; balance_info.halftime = 1; balance_info.full_reds_history_index = 0; erts_smp_atomic32_init_nob(&balance_info.checking_balance, 0); balance_info.prev_rise.active_runqs = 0; balance_info.prev_rise.max_len = 0; balance_info.prev_rise.reds = 0; balance_info.n = 0; init_migration_paths(); if (no_schedulers_online < no_schedulers) { change_no_used_runqs(no_schedulers_online); for (ix = no_schedulers_online; ix < erts_no_run_queues; ix++) suspend_run_queue(ERTS_RUNQ_IX(ix)); } schdlr_sspnd.wait_curr_online = no_schedulers_online; schdlr_sspnd.curr_online *= 2; /* Boot strapping... */ ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_ONLN | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); erts_smp_atomic32_init_nob(&doing_sys_schedule, 0); init_misc_aux_work(); #else /* !ERTS_SMP */ { ErtsSchedulerData *esdp; esdp = ERTS_SCHEDULER_IX(0); erts_scheduler_data = esdp; #ifdef USE_THREADS erts_tsd_set(sched_data_key, (void *) esdp); #endif } erts_no_schedulers = 1; #endif erts_smp_atomic32_init_nob(&function_calls, 0); /* init port tasks */ erts_port_task_init(); aux_work_timeout_late_init(); #ifndef ERTS_SMP #ifdef ERTS_DO_VERIFY_UNUSED_TEMP_ALLOC erts_scheduler_data->verify_unused_temp_alloc = erts_alloc_get_verify_unused_temp_alloc( &erts_scheduler_data->verify_unused_temp_alloc_data); ERTS_VERIFY_UNUSED_TEMP_ALLOC(NULL); #endif #endif erts_smp_atomic32_init_relb(&erts_halt_progress, -1); erts_halt_code = 0; } ErtsRunQueue * erts_schedid2runq(Uint id) { int ix; ix = (int) id - 1; ASSERT(0 <= ix && ix < erts_no_run_queues); return ERTS_RUNQ_IX(ix); } #ifdef USE_THREADS ErtsSchedulerData * erts_get_scheduler_data(void) { return (ErtsSchedulerData *) erts_tsd_get(sched_data_key); } #endif /* * scheduler_out_process() return with c_rq locked. */ static ERTS_INLINE int schedule_out_process(ErtsRunQueue *c_rq, erts_aint32_t state, Process *p) { erts_aint32_t a, e, n; int res = 0; a = state; while (1) { n = e = a; ASSERT(a & ERTS_PSFLG_RUNNING); ASSERT(!(a & ERTS_PSFLG_IN_RUNQ)); n &= ~ERTS_PSFLG_RUNNING; if ((a & (ERTS_PSFLG_ACTIVE|ERTS_PSFLG_SUSPENDED)) == ERTS_PSFLG_ACTIVE) n |= ERTS_PSFLG_IN_RUNQ; a = erts_smp_atomic32_cmpxchg_mb(&p->state, n, e); if (a == e) break; } if (!(n & ERTS_PSFLG_IN_RUNQ)) { if (erts_system_profile_flags.runnable_procs) profile_runnable_proc(p, am_inactive); } else { int prio = (int) (ERTS_PSFLG_PRIO_MASK & n); ErtsRunQueue *runq = erts_get_runq_proc(p); ASSERT(!(n & ERTS_PSFLG_SUSPENDED)); #ifdef ERTS_SMP if (!(ERTS_PSFLG_BOUND & n)) { ErtsRunQueue *new_runq = erts_check_emigration_need(runq, prio); if (new_runq) { RUNQ_SET_RQ(&p->run_queue, new_runq); runq = new_runq; } } #endif ASSERT(runq); res = 1; erts_smp_runq_lock(runq); /* Enqueue the process */ enqueue_process(runq, prio, p); if (runq == c_rq) return res; erts_smp_runq_unlock(runq); smp_notify_inc_runq(runq); } erts_smp_runq_lock(c_rq); return res; } static ERTS_INLINE void add2runq(Process *p, erts_aint32_t state) { int prio = (int) (ERTS_PSFLG_PRIO_MASK & state); ErtsRunQueue *runq = erts_get_runq_proc(p); #ifdef ERTS_SMP if (!(ERTS_PSFLG_BOUND & state)) { ErtsRunQueue *new_runq = erts_check_emigration_need(runq, prio); if (new_runq) { RUNQ_SET_RQ(&p->run_queue, new_runq); runq = new_runq; } } #endif ASSERT(runq); erts_smp_runq_lock(runq); /* Enqueue the process */ enqueue_process(runq, prio, p); erts_smp_runq_unlock(runq); smp_notify_inc_runq(runq); } static ERTS_INLINE void schedule_process(Process *p, erts_aint32_t state, int active_enq) { erts_aint32_t a = state, n; while (1) { erts_aint32_t e; n = e = a; if (a & ERTS_PSFLG_FREE) return; /* We don't want to schedule free processes... */ n |= ERTS_PSFLG_ACTIVE; if (!(a & (ERTS_PSFLG_SUSPENDED|ERTS_PSFLG_RUNNING))) n |= ERTS_PSFLG_IN_RUNQ; a = erts_smp_atomic32_cmpxchg_mb(&p->state, n, e); if (a == e) break; if (!active_enq && (a & ERTS_PSFLG_ACTIVE)) return; /* Someone else activated process ... */ } if (erts_system_profile_flags.runnable_procs && !(a & (ERTS_PSFLG_ACTIVE|ERTS_PSFLG_SUSPENDED))) { profile_runnable_proc(p, am_active); } if ((n & ERTS_PSFLG_IN_RUNQ) && !(a & ERTS_PSFLG_IN_RUNQ)) add2runq(p, n); } void erts_schedule_process(Process *p, erts_aint32_t state) { schedule_process(p, state, 0); } static ERTS_INLINE int suspend_process(Process *c_p, Process *p) { erts_aint32_t state = erts_smp_atomic32_read_acqb(&p->state); int suspended = 0; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); if ((state & ERTS_PSFLG_SUSPENDED)) suspended = -1; else { if (c_p == p) { state = erts_smp_atomic32_read_bor_relb(&p->state, ERTS_PSFLG_SUSPENDED); state |= ERTS_PSFLG_SUSPENDED; ASSERT(state & ERTS_PSFLG_RUNNING); suspended = 1; } else { while (!(state & (ERTS_PSFLG_RUNNING|ERTS_PSFLG_EXITING))) { erts_aint32_t e, n; n = e = state; n |= ERTS_PSFLG_SUSPENDED; state = erts_smp_atomic32_cmpxchg_relb(&p->state, n, e); if (state == e) { state = n; suspended = 1; break; } } } } if (state & ERTS_PSFLG_SUSPENDED) { ASSERT(!(ERTS_PSFLG_RUNNING & state) || p == erts_get_current_process()); if (erts_system_profile_flags.runnable_procs && (p->rcount == 0) && (state & ERTS_PSFLG_ACTIVE)) { profile_runnable_proc(p, am_inactive); } p->rcount++; /* count number of suspend */ } return suspended; } static ERTS_INLINE void resume_process(Process *p) { erts_aint32_t state; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); ASSERT(p->rcount > 0); if (--p->rcount > 0) /* multiple suspend */ return; state = erts_smp_atomic32_read_band_mb(&p->state, ~ERTS_PSFLG_SUSPENDED); state &= ~ERTS_PSFLG_SUSPENDED; if ((state & (ERTS_PSFLG_EXITING | ERTS_PSFLG_ACTIVE | ERTS_PSFLG_IN_RUNQ | ERTS_PSFLG_RUNNING)) == ERTS_PSFLG_ACTIVE) { schedule_process(p, state, 1); } } int erts_get_max_no_executing_schedulers(void) { #ifdef ERTS_SMP if (erts_smp_atomic32_read_nob(&schdlr_sspnd.changing)) return (int) erts_no_schedulers; ERTS_THR_MEMORY_BARRIER; return (int) erts_smp_atomic32_read_nob(&schdlr_sspnd.active); #else return 1; #endif } #ifdef ERTS_SMP static void scheduler_ix_resume_wake(Uint ix) { ErtsSchedulerSleepInfo *ssi = ERTS_SCHED_SLEEP_INFO_IX(ix); erts_aint32_t xflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t oflgs; do { oflgs = erts_smp_atomic32_cmpxchg_relb(&ssi->flags, 0, xflgs); if (oflgs == xflgs) { erts_sched_finish_poke(ssi, oflgs); break; } xflgs = oflgs; } while (oflgs & ERTS_SSI_FLG_SUSPENDED); } static erts_aint32_t sched_prep_spin_suspended(ErtsSchedulerSleepInfo *ssi, erts_aint32_t xpct) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t xflgs = xpct; do { oflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; xflgs = oflgs; } while (oflgs & ERTS_SSI_FLG_SUSPENDED); return oflgs; } static erts_aint32_t sched_spin_suspended(ErtsSchedulerSleepInfo *ssi, int spincount) { int until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; int sc = spincount; erts_aint32_t flgs; do { flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if ((flgs & (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) != (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { break; } ERTS_SPIN_BODY; if (--until_yield == 0) { until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD; erts_thr_yield(); } } while (--sc > 0); return flgs; } static erts_aint32_t sched_set_suspended_sleeptype(ErtsSchedulerSleepInfo *ssi) { erts_aint32_t oflgs; erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_aint32_t xflgs = (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED); erts_tse_reset(ssi->event); while (1) { oflgs = erts_smp_atomic32_cmpxchg_acqb(&ssi->flags, nflgs, xflgs); if (oflgs == xflgs) return nflgs; if ((oflgs & (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) != (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { return oflgs; } xflgs = oflgs; } } static void suspend_scheduler(ErtsSchedulerData *esdp) { erts_aint32_t flgs; erts_aint32_t changing; long no = (long) esdp->no; ErtsSchedulerSleepInfo *ssi = esdp->ssi; long active_schedulers; int curr_online = 1; int wake = 0; erts_aint32_t aux_work; int thr_prgr_active = 1; ErtsStuckBoundProcesses sbp = {NULL, NULL}; /* * Schedulers may be suspended in two different ways: * - A scheduler may be suspended since it is not online. * All schedulers with scheduler ids greater than * schdlr_sspnd.online are suspended. * - Multi scheduling is blocked. All schedulers except the * scheduler with scheduler id 1 are suspended. * * Regardless of why a scheduler is suspended, it ends up here. */ ASSERT(no != 1); evacuate_run_queue(esdp->run_queue, &sbp); erts_smp_runq_unlock(esdp->run_queue); erts_sched_check_cpu_bind_prep_suspend(esdp); if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(esdp->no), am_inactive); sched_wall_time_change(esdp, 0); erts_smp_mtx_lock(&schdlr_sspnd.mtx); flgs = sched_prep_spin_suspended(ssi, ERTS_SSI_FLG_SUSPENDED); if (flgs & ERTS_SSI_FLG_SUSPENDED) { active_schedulers = erts_smp_atomic32_dec_read_nob(&schdlr_sspnd.active); ASSERT(active_schedulers >= 1); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if (changing & ERTS_SCHDLR_SSPND_CHNG_MSB) { if (active_schedulers == schdlr_sspnd.msb.wait_active) wake = 1; if (active_schedulers == 1) { changing = erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_MSB); changing &= ~ERTS_SCHDLR_SSPND_CHNG_MSB; } } while (1) { if (changing & ERTS_SCHDLR_SSPND_CHNG_ONLN) { int changed = 0; if (no > schdlr_sspnd.online && curr_online) { schdlr_sspnd.curr_online--; curr_online = 0; changed = 1; } else if (no <= schdlr_sspnd.online && !curr_online) { schdlr_sspnd.curr_online++; curr_online = 1; changed = 1; } if (changed && schdlr_sspnd.curr_online == schdlr_sspnd.wait_curr_online) wake = 1; if (schdlr_sspnd.online == schdlr_sspnd.curr_online) { changing = erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_ONLN); changing &= ~ERTS_SCHDLR_SSPND_CHNG_ONLN; } } if (wake) { erts_smp_cnd_signal(&schdlr_sspnd.cnd); wake = 0; } if (curr_online && !ongoing_multi_scheduling_block()) { flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_SUSPENDED)) break; } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); while (1) { erts_aint32_t qmask; erts_aint32_t flgs; qmask = (ERTS_RUNQ_FLGS_GET(esdp->run_queue) & ERTS_RUNQ_FLGS_QMASK); aux_work = erts_atomic32_read_acqb(&ssi->aux_work); if (aux_work|qmask) { if (!thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 1); sched_wall_time_change(esdp, 1); } if (aux_work) aux_work = handle_aux_work(&esdp->aux_work_data, aux_work, 1); if (aux_work && erts_thr_progress_update(esdp)) erts_thr_progress_leader_update(esdp); if (qmask) { erts_smp_runq_lock(esdp->run_queue); evacuate_run_queue(esdp->run_queue, &sbp); erts_smp_runq_unlock(esdp->run_queue); } } if (!aux_work) { if (thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 0); sched_wall_time_change(esdp, 0); } erts_thr_progress_prepare_wait(esdp); flgs = sched_spin_suspended(ssi, ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT); if (flgs == (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { flgs = sched_set_suspended_sleeptype(ssi); if (flgs == (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_TSE_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) { int res; do { res = erts_tse_wait(ssi->event); } while (res == EINTR); } } erts_thr_progress_finalize_wait(esdp); } flgs = sched_prep_spin_suspended(ssi, (ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)); if (!(flgs & ERTS_SSI_FLG_SUSPENDED)) break; changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if (changing & ~ERTS_SCHDLR_SSPND_CHNG_WAITER) break; } erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); } active_schedulers = erts_smp_atomic32_inc_read_nob(&schdlr_sspnd.active); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB) && schdlr_sspnd.online == active_schedulers) { erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_MSB); } ASSERT(no <= schdlr_sspnd.online); ASSERT(!ongoing_multi_scheduling_block()); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); ASSERT(curr_online); if (erts_system_profile_flags.scheduler) profile_scheduler(make_small(esdp->no), am_active); if (!thr_prgr_active) { erts_thr_progress_active(esdp, thr_prgr_active = 1); sched_wall_time_change(esdp, 1); } erts_smp_runq_lock(esdp->run_queue); non_empty_runq(esdp->run_queue); schedule_bound_processes(esdp->run_queue, &sbp); erts_sched_check_cpu_bind_post_suspend(esdp); } ErtsSchedSuspendResult erts_schedulers_state(Uint *total, Uint *online, Uint *active, int yield_allowed) { int res; erts_aint32_t changing; erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if (yield_allowed && (changing & ~ERTS_SCHDLR_SSPND_CHNG_WAITER)) res = ERTS_SCHDLR_SSPND_YIELD_RESTART; else { *active = *online = schdlr_sspnd.online; if (ongoing_multi_scheduling_block()) *active = 1; res = ERTS_SCHDLR_SSPND_DONE; } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); *total = erts_no_schedulers; return res; } ErtsSchedSuspendResult erts_set_schedulers_online(Process *p, ErtsProcLocks plocks, Sint new_no, Sint *old_no) { ErtsSchedulerData *esdp; int ix, res, no, have_unlocked_plocks, end_wait; erts_aint32_t changing; if (new_no < 1 || erts_no_schedulers < new_no) return ERTS_SCHDLR_SSPND_EINVAL; esdp = ERTS_PROC_GET_SCHDATA(p); end_wait = 0; erts_smp_mtx_lock(&schdlr_sspnd.mtx); have_unlocked_plocks = 0; no = (int) new_no; changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if (changing) { res = ERTS_SCHDLR_SSPND_YIELD_RESTART; } else { int online = *old_no = schdlr_sspnd.online; if (no == schdlr_sspnd.online) { res = ERTS_SCHDLR_SSPND_DONE; } else { ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_ONLN | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); schdlr_sspnd.online = no; if (no > online) { int ix; schdlr_sspnd.wait_curr_online = no; if (ongoing_multi_scheduling_block()) { for (ix = online; ix < no; ix++) erts_sched_poke(ERTS_SCHED_SLEEP_INFO_IX(ix)); } else { if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } change_no_used_runqs(no); for (ix = online; ix < no; ix++) resume_run_queue(ERTS_RUNQ_IX(ix)); for (ix = no; ix < erts_no_run_queues; ix++) suspend_run_queue(ERTS_RUNQ_IX(ix)); } res = ERTS_SCHDLR_SSPND_DONE; } else /* if (no < online) */ { if (p->scheduler_data->no <= no) { res = ERTS_SCHDLR_SSPND_DONE; schdlr_sspnd.wait_curr_online = no; } else { /* * Yield! Current process needs to migrate * before bif returns. */ res = ERTS_SCHDLR_SSPND_YIELD_DONE; schdlr_sspnd.wait_curr_online = no+1; } if (ongoing_multi_scheduling_block()) { for (ix = no; ix < online; ix++) erts_sched_poke(ERTS_SCHED_SLEEP_INFO_IX(ix)); } else { if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } change_no_used_runqs(no); for (ix = no; ix < erts_no_run_queues; ix++) suspend_run_queue(ERTS_RUNQ_IX(ix)); for (ix = no; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); wake_scheduler(rq, 0); } } } if (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) { erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (plocks && !have_unlocked_plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } erts_thr_progress_active(esdp, 0); erts_thr_progress_prepare_wait(esdp); end_wait = 1; erts_smp_mtx_lock(&schdlr_sspnd.mtx); } while (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); ASSERT(res != ERTS_SCHDLR_SSPND_DONE ? (ERTS_SCHDLR_SSPND_CHNG_WAITER & erts_smp_atomic32_read_nob(&schdlr_sspnd.changing)) : (ERTS_SCHDLR_SSPND_CHNG_WAITER == erts_smp_atomic32_read_nob(&schdlr_sspnd.changing))); erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_WAITER); } } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (end_wait) { erts_thr_progress_finalize_wait(esdp); erts_thr_progress_active(esdp, 1); } if (have_unlocked_plocks) erts_smp_proc_lock(p, plocks); return res; } ErtsSchedSuspendResult erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int all) { int ix, res, have_unlocked_plocks = 0; erts_aint32_t changing; ErtsProcList *plp; erts_smp_mtx_lock(&schdlr_sspnd.mtx); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); if (changing) { res = ERTS_SCHDLR_SSPND_YIELD_RESTART; /* Yield */ } else if (on) { /* ------ BLOCK ------ */ if (schdlr_sspnd.msb.procs) { plp = proclist_create(p); plp->next = schdlr_sspnd.msb.procs; schdlr_sspnd.msb.procs = plp; p->flags |= F_HAVE_BLCKD_MSCHED; ASSERT(erts_smp_atomic32_read_nob(&schdlr_sspnd.active) == 1); ASSERT(p->scheduler_data->no == 1); res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; } else { int online = schdlr_sspnd.online; p->flags |= F_HAVE_BLCKD_MSCHED; if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } ASSERT(!ongoing_multi_scheduling_block()); schdlr_sspnd.msb.ongoing = 1; if (online == 1) { res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; ASSERT(erts_smp_atomic32_read_nob(&schdlr_sspnd.active) == 1); ASSERT(p->scheduler_data->no == 1); } else { ERTS_SCHDLR_SSPND_CHNG_SET((ERTS_SCHDLR_SSPND_CHNG_MSB | ERTS_SCHDLR_SSPND_CHNG_WAITER), 0); if (p->scheduler_data->no == 1) { res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; schdlr_sspnd.msb.wait_active = 1; } else { /* * Yield! Current process needs to migrate * before bif returns. */ res = ERTS_SCHDLR_SSPND_YIELD_DONE_MSCHED_BLOCKED; schdlr_sspnd.msb.wait_active = 2; } change_no_used_runqs(1); for (ix = 1; ix < erts_no_run_queues; ix++) suspend_run_queue(ERTS_RUNQ_IX(ix)); for (ix = 1; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); wake_scheduler(rq, 0); } if (erts_smp_atomic32_read_nob(&schdlr_sspnd.active) != schdlr_sspnd.msb.wait_active) { ErtsSchedulerData *esdp; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (plocks && !have_unlocked_plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } esdp = ERTS_PROC_GET_SCHDATA(p); erts_thr_progress_active(esdp, 0); erts_thr_progress_prepare_wait(esdp); erts_smp_mtx_lock(&schdlr_sspnd.mtx); while (erts_smp_atomic32_read_nob(&schdlr_sspnd.active) != schdlr_sspnd.msb.wait_active) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); erts_smp_mtx_unlock(&schdlr_sspnd.mtx); erts_thr_progress_active(esdp, 1); erts_thr_progress_finalize_wait(esdp); erts_smp_mtx_lock(&schdlr_sspnd.mtx); } ASSERT(res != ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED ? (ERTS_SCHDLR_SSPND_CHNG_WAITER & erts_smp_atomic32_read_nob(&schdlr_sspnd.changing)) : (ERTS_SCHDLR_SSPND_CHNG_WAITER == erts_smp_atomic32_read_nob(&schdlr_sspnd.changing))); erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_WAITER); } plp = proclist_create(p); plp->next = schdlr_sspnd.msb.procs; schdlr_sspnd.msb.procs = plp; ASSERT(p->scheduler_data); } } else if (!ongoing_multi_scheduling_block()) { /* unblock not ongoing */ ASSERT(!schdlr_sspnd.msb.procs); res = ERTS_SCHDLR_SSPND_DONE; } else { /* ------ UNBLOCK ------ */ if (p->flags & F_HAVE_BLCKD_MSCHED) { ErtsProcList **plpp = &schdlr_sspnd.msb.procs; plp = schdlr_sspnd.msb.procs; while (plp) { if (!proclist_same(plp, p)){ plpp = &plp->next; plp = plp->next; } else { *plpp = plp->next; proclist_destroy(plp); if (!all) break; plp = *plpp; } } } if (schdlr_sspnd.msb.procs) res = ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED; else { ERTS_SCHDLR_SSPND_CHNG_SET(ERTS_SCHDLR_SSPND_CHNG_MSB, 0); p->flags &= ~F_HAVE_BLCKD_MSCHED; schdlr_sspnd.msb.ongoing = 0; if (schdlr_sspnd.online == 1) { /* No schedulers to resume */ ASSERT(erts_smp_atomic32_read_nob(&schdlr_sspnd.active) == 1); ERTS_SCHDLR_SSPND_CHNG_SET(0, ERTS_SCHDLR_SSPND_CHNG_MSB); } else { int online = schdlr_sspnd.online; if (plocks) { have_unlocked_plocks = 1; erts_smp_proc_unlock(p, plocks); } change_no_used_runqs(online); /* Resume all online run queues */ for (ix = 1; ix < online; ix++) resume_run_queue(ERTS_RUNQ_IX(ix)); for (ix = online; ix < erts_no_run_queues; ix++) suspend_run_queue(ERTS_RUNQ_IX(ix)); } res = ERTS_SCHDLR_SSPND_DONE; } } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (have_unlocked_plocks) erts_smp_proc_lock(p, plocks); return res; } #ifdef DEBUG void erts_dbg_multi_scheduling_return_trap(Process *p, Eterm return_value) { if (return_value == am_blocked) { erts_aint32_t active = erts_smp_atomic32_read_nob(&schdlr_sspnd.active); ASSERT(1 <= active && active <= 2); ASSERT(ERTS_PROC_GET_SCHDATA(p)->no == 1); } } #endif int erts_is_multi_scheduling_blocked(void) { int res; erts_smp_mtx_lock(&schdlr_sspnd.mtx); res = schdlr_sspnd.msb.procs != NULL; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); return res; } Eterm erts_multi_scheduling_blockers(Process *p) { Eterm res = NIL; erts_smp_mtx_lock(&schdlr_sspnd.mtx); if (schdlr_sspnd.msb.procs) { Eterm *hp, *hp_end; ErtsProcList *plp1, *plp2; Uint max_size; ASSERT(schdlr_sspnd.msb.procs); for (max_size = 0, plp1 = schdlr_sspnd.msb.procs; plp1; plp1 = plp1->next) { max_size += 2; } ASSERT(max_size); hp = HAlloc(p, max_size); hp_end = hp + max_size; for (plp1 = schdlr_sspnd.msb.procs; plp1; plp1 = plp1->next) { for (plp2 = schdlr_sspnd.msb.procs; plp2->pid != plp1->pid; plp2 = plp2->next); if (plp2 == plp1) { res = CONS(hp, plp1->pid, res); hp += 2; } /* else: already in result list */ } HRelease(p, hp_end, hp); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); return res; } static void * sched_thread_func(void *vesdp) { ErtsThrPrgrCallbacks callbacks; ErtsSchedulerData *esdp = vesdp; Uint no = esdp->no; #ifdef ERTS_SMP ERTS_SCHED_SLEEP_INFO_IX(no - 1)->event = erts_tse_fetch(); callbacks.arg = (void *) esdp->ssi; callbacks.wakeup = thr_prgr_wakeup; callbacks.prepare_wait = thr_prgr_prep_wait; callbacks.wait = thr_prgr_wait; callbacks.finalize_wait = thr_prgr_fin_wait; erts_thr_progress_register_managed_thread(esdp, &callbacks, 0); erts_alloc_register_scheduler(vesdp); #endif #ifdef ERTS_ENABLE_LOCK_CHECK { char buf[31]; erts_snprintf(&buf[0], 31, "scheduler %beu", no); erts_lc_set_thread_name(&buf[0]); } #endif erts_tsd_set(sched_data_key, vesdp); #ifdef ERTS_SMP #if HAVE_ERTS_MSEG erts_mseg_late_init(); #endif #if ERTS_USE_ASYNC_READY_Q esdp->aux_work_data.async_ready.queue = erts_get_async_ready_queue(no); #endif erts_sched_init_check_cpu_bind(esdp); erts_proc_lock_prepare_proc_lock_waiter(); #endif #ifdef HIPE hipe_thread_signal_init(); #endif erts_thread_init_float(); if (no == 1) { erts_thr_progress_active(esdp, 0); erts_thr_progress_prepare_wait(esdp); } erts_smp_mtx_lock(&schdlr_sspnd.mtx); ASSERT(erts_smp_atomic32_read_nob(&schdlr_sspnd.changing) & ERTS_SCHDLR_SSPND_CHNG_ONLN); if (--schdlr_sspnd.curr_online == schdlr_sspnd.wait_curr_online) { erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, ~ERTS_SCHDLR_SSPND_CHNG_ONLN); if (no != 1) erts_smp_cnd_signal(&schdlr_sspnd.cnd); } if (no == 1) { while (schdlr_sspnd.curr_online != schdlr_sspnd.wait_curr_online) erts_smp_cnd_wait(&schdlr_sspnd.cnd, &schdlr_sspnd.mtx); ERTS_SCHDLR_SSPND_CHNG_SET(0, ERTS_SCHDLR_SSPND_CHNG_WAITER); } erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (no == 1) { erts_thr_progress_finalize_wait(esdp); erts_thr_progress_active(esdp, 1); } #ifdef ERTS_DO_VERIFY_UNUSED_TEMP_ALLOC esdp->verify_unused_temp_alloc = erts_alloc_get_verify_unused_temp_alloc( &esdp->verify_unused_temp_alloc_data); ERTS_VERIFY_UNUSED_TEMP_ALLOC(NULL); #endif process_main(); /* No schedulers should *ever* terminate */ erl_exit(ERTS_ABORT_EXIT, "Scheduler thread number %beu terminated\n", no); return NULL; } static ethr_tid aux_tid; void erts_start_schedulers(void) { int res = 0; Uint actual = 0; Uint wanted = erts_no_schedulers; Uint wanted_no_schedulers = erts_no_schedulers; ethr_thr_opts opts = ETHR_THR_OPTS_DEFAULT_INITER; opts.detached = 1; opts.suggested_stack_size = erts_sched_thread_suggested_stack_size; if (wanted < 1) wanted = 1; if (wanted > ERTS_MAX_NO_OF_SCHEDULERS) { wanted = ERTS_MAX_NO_OF_SCHEDULERS; res = ENOTSUP; } while (actual < wanted) { ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(actual); actual++; ASSERT(actual == esdp->no); res = ethr_thr_create(&esdp->tid,sched_thread_func,(void*)esdp,&opts); if (res != 0) { actual--; break; } } erts_no_schedulers = actual; ERTS_THR_MEMORY_BARRIER; res = ethr_thr_create(&aux_tid, aux_thread, NULL, &opts); if (res != 0) erl_exit(1, "Failed to create aux thread\n"); if (actual < 1) erl_exit(1, "Failed to create any scheduler-threads: %s (%d)\n", erl_errno_id(res), res); if (res != 0) { erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); ASSERT(actual != wanted_no_schedulers); erts_dsprintf(dsbufp, "Failed to create %beu scheduler-threads (%s:%d); " "only %beu scheduler-thread%s created.\n", wanted_no_schedulers, erl_errno_id(res), res, actual, actual == 1 ? " was" : "s were"); erts_send_error_to_logger_nogl(dsbufp); } } #endif /* ERTS_SMP */ #ifdef ERTS_SMP static void add_pend_suspend(Process *suspendee, Eterm originator_pid, void (*handle_func)(Process *, ErtsProcLocks, int, Eterm)) { ErtsPendingSuspend *psp = erts_alloc(ERTS_ALC_T_PEND_SUSPEND, sizeof(ErtsPendingSuspend)); psp->next = NULL; #ifdef DEBUG #if defined(ARCH_64) && !HALFWORD_HEAP psp->end = (ErtsPendingSuspend *) 0xdeaddeaddeaddead; #else psp->end = (ErtsPendingSuspend *) 0xdeaddead; #endif #endif psp->pid = originator_pid; psp->handle_func = handle_func; if (suspendee->pending_suspenders) suspendee->pending_suspenders->end->next = psp; else suspendee->pending_suspenders = psp; suspendee->pending_suspenders->end = psp; } static void handle_pending_suspend(Process *p, ErtsProcLocks p_locks) { ErtsPendingSuspend *psp; int is_alive = !ERTS_PROC_IS_EXITING(p); ERTS_SMP_LC_ASSERT(p_locks & ERTS_PROC_LOCK_STATUS); /* * New pending suspenders might appear while we are processing * (since we may release the status lock on p while processing). */ while (p->pending_suspenders) { psp = p->pending_suspenders; p->pending_suspenders = NULL; while (psp) { ErtsPendingSuspend *free_psp; (*psp->handle_func)(p, p_locks, is_alive, psp->pid); free_psp = psp; psp = psp->next; erts_free(ERTS_ALC_T_PEND_SUSPEND, (void *) free_psp); } } } static ERTS_INLINE void cancel_suspend_of_suspendee(Process *p, ErtsProcLocks p_locks) { if (is_not_nil(p->suspendee)) { Process *rp; if (!(p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); rp = erts_pid2proc(p, p_locks|ERTS_PROC_LOCK_STATUS, p->suspendee, ERTS_PROC_LOCK_STATUS); if (rp) { erts_resume(rp, ERTS_PROC_LOCK_STATUS); erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); } if (!(p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); p->suspendee = NIL; } } static void handle_pend_sync_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_STATUS); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (suspendee_alive) { erts_suspend(suspendee, suspendee_locks, NULL); suspender->suspendee = suspendee->id; } /* suspender is suspended waiting for suspendee to suspend; resume suspender */ resume_process(suspender); erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_STATUS); } } static Process * pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks, int suspend) { Process *rp; int unlock_c_p_status; ERTS_SMP_LC_ASSERT(c_p_locks == erts_proc_lc_my_proc_locks(c_p)); ERTS_SMP_LC_ASSERT(c_p_locks & ERTS_PROC_LOCK_MAIN); ERTS_SMP_LC_ASSERT(pid_locks & (ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS)); if (c_p->id == pid) return erts_pid2proc(c_p, c_p_locks, pid, pid_locks); if (c_p_locks & ERTS_PROC_LOCK_STATUS) unlock_c_p_status = 0; else { unlock_c_p_status = 1; erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_STATUS); } if (c_p->suspendee == pid) { /* Process previously suspended by c_p (below)... */ ErtsProcLocks rp_locks = pid_locks|ERTS_PROC_LOCK_STATUS; rp = erts_pid2proc(c_p, c_p_locks|ERTS_PROC_LOCK_STATUS, pid, rp_locks); c_p->suspendee = NIL; ASSERT(c_p->flags & F_P2PNR_RESCHED); c_p->flags &= ~F_P2PNR_RESCHED; if (!suspend && rp) resume_process(rp); } else { rp = erts_pid2proc(c_p, c_p_locks|ERTS_PROC_LOCK_STATUS, pid, pid_locks|ERTS_PROC_LOCK_STATUS); if (!rp) { c_p->flags &= ~F_P2PNR_RESCHED; goto done; } ASSERT(!(c_p->flags & F_P2PNR_RESCHED)); if (suspend) { if (suspend_process(c_p, rp)) goto done; } else { if (!(ERTS_PSFLG_RUNNING & erts_smp_atomic32_read_acqb(&rp->state))) goto done; } /* Other process running */ /* * If we got pending suspenders and suspend ourselves waiting * to suspend another process we might deadlock. * In this case we have to yield, be suspended by * someone else and then do it all over again. */ if (!c_p->pending_suspenders) { /* Mark rp pending for suspend by c_p */ add_pend_suspend(rp, c_p->id, handle_pend_sync_suspend); ASSERT(is_nil(c_p->suspendee)); /* Suspend c_p; when rp is suspended c_p will be resumed. */ suspend_process(c_p, c_p); c_p->flags |= F_P2PNR_RESCHED; } /* Yield (caller is assumed to yield immediately in bif). */ erts_smp_proc_unlock(rp, pid_locks|ERTS_PROC_LOCK_STATUS); rp = ERTS_PROC_LOCK_BUSY; } done: if (rp && rp != ERTS_PROC_LOCK_BUSY && !(pid_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_STATUS); if (unlock_c_p_status) erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_STATUS); return rp; } /* * Like erts_pid2proc() but: * * * At least ERTS_PROC_LOCK_MAIN have to be held on c_p. * * At least ERTS_PROC_LOCK_MAIN have to be taken on pid. * * It also waits for proc to be in a state != running and garbing. * * If ERTS_PROC_LOCK_BUSY is returned, the calling process has to * yield (ERTS_BIF_YIELD[0-3]()). c_p might in this case have been * suspended. */ Process * erts_pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { return pid2proc_not_running(c_p, c_p_locks, pid, pid_locks, 0); } /* * Like erts_pid2proc_not_running(), but hands over the process * in a suspended state unless (c_p is looked up). */ Process * erts_pid2proc_suspend(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { return pid2proc_not_running(c_p, c_p_locks, pid, pid_locks, 1); } /* * erts_pid2proc_nropt() is normally the same as * erts_pid2proc_not_running(). However it is only * to be used when 'not running' is a pure optimization, * not a requirement. */ Process * erts_pid2proc_nropt(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { if (erts_disable_proc_not_running_opt) return erts_pid2proc(c_p, c_p_locks, pid, pid_locks); else return erts_pid2proc_not_running(c_p, c_p_locks, pid, pid_locks); } static ERTS_INLINE int do_bif_suspend_process(Process *c_p, ErtsSuspendMonitor *smon, Process *suspendee) { ASSERT(suspendee); ASSERT(!ERTS_PROC_IS_EXITING(suspendee)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(suspendee)); if (smon) { if (!smon->active) { if (!suspend_process(c_p, suspendee)) return 0; } smon->active += smon->pending; ASSERT(smon->active); smon->pending = 0; return 1; } return 0; } static void handle_pend_bif_sync_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (!suspendee_alive) erts_delete_suspend_monitor(&suspender->suspend_monitors, suspendee->id); else { #ifdef DEBUG int res; #endif ErtsSuspendMonitor *smon; smon = erts_lookup_suspend_monitor(suspender->suspend_monitors, suspendee->id); #ifdef DEBUG res = #endif do_bif_suspend_process(suspendee, smon, suspendee); ASSERT(!smon || res != 0); suspender->suspendee = suspendee->id; } /* suspender is suspended waiting for suspendee to suspend; resume suspender */ resume_process(suspender); erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS); } } static void handle_pend_bif_async_suspend(Process *suspendee, ErtsProcLocks suspendee_locks, int suspendee_alive, Eterm suspender_pid) { Process *suspender; ERTS_SMP_LC_ASSERT(suspendee_locks & ERTS_PROC_LOCK_STATUS); suspender = erts_pid2proc(suspendee, suspendee_locks, suspender_pid, ERTS_PROC_LOCK_LINK); if (suspender) { ASSERT(is_nil(suspender->suspendee)); if (!suspendee_alive) erts_delete_suspend_monitor(&suspender->suspend_monitors, suspendee->id); else { #ifdef DEBUG int res; #endif ErtsSuspendMonitor *smon; smon = erts_lookup_suspend_monitor(suspender->suspend_monitors, suspendee->id); #ifdef DEBUG res = #endif do_bif_suspend_process(suspendee, smon, suspendee); ASSERT(!smon || res != 0); } erts_smp_proc_unlock(suspender, ERTS_PROC_LOCK_LINK); } } #else /* * Non-smp version of erts_pid2proc_suspend(). */ Process * erts_pid2proc_suspend(Process *c_p, ErtsProcLocks c_p_locks, Eterm pid, ErtsProcLocks pid_locks) { Process *rp = erts_pid2proc(c_p, c_p_locks, pid, pid_locks); if (rp) erts_suspend(rp, pid_locks, NULL); return rp; } #endif /* ERTS_SMP */ /* * The erlang:suspend_process/2 BIF */ BIF_RETTYPE suspend_process_2(BIF_ALIST_2) { Eterm res; Process* suspendee = NULL; ErtsSuspendMonitor *smon; ErtsProcLocks xlocks = (ErtsProcLocks) 0; /* Options and default values: */ int asynchronous = 0; int unless_suspending = 0; if (BIF_P->id == BIF_ARG_1) goto badarg; /* We are not allowed to suspend ourselves */ if (is_not_nil(BIF_ARG_2)) { /* Parse option list */ Eterm arg = BIF_ARG_2; while (is_list(arg)) { Eterm *lp = list_val(arg); arg = CAR(lp); switch (arg) { case am_unless_suspending: unless_suspending = 1; break; case am_asynchronous: asynchronous = 1; break; default: goto badarg; } arg = CDR(lp); } if (is_not_nil(arg)) goto badarg; } xlocks = ERTS_PROC_LOCK_LINK | (asynchronous ? (ErtsProcLocks) 0 : ERTS_PROC_LOCK_STATUS); erts_smp_proc_lock(BIF_P, xlocks); suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|xlocks, BIF_ARG_1, ERTS_PROC_LOCK_STATUS); if (!suspendee) goto no_suspendee; smon = erts_add_or_lookup_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); #ifndef ERTS_SMP /* no ERTS_SMP */ /* This is really a piece of cake without SMP support... */ if (!smon->active) { erts_smp_atomic32_read_bor_nob(&suspendee->state, ERTS_PSFLG_SUSPENDED); suspend_process(BIF_P, suspendee); smon->active++; res = am_true; } else if (unless_suspending) res = am_false; else if (smon->active == INT_MAX) goto system_limit; else { smon->active++; res = am_true; } #else /* ERTS_SMP */ /* ... but a little trickier with SMP support ... */ if (asynchronous) { /* --- Asynchronous suspend begin ---------------------------------- */ ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_LINK & erts_proc_lc_my_proc_locks(BIF_P)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS == erts_proc_lc_my_proc_locks(suspendee)); if (smon->active) { smon->active += smon->pending; smon->pending = 0; if (unless_suspending) res = am_false; else if (smon->active == INT_MAX) goto system_limit; else { smon->active++; res = am_true; } /* done */ } else { /* We havn't got any active suspends on the suspendee */ if (smon->pending && unless_suspending) res = am_false; else { if (smon->pending == INT_MAX) goto system_limit; smon->pending++; if (!do_bif_suspend_process(BIF_P, smon, suspendee)) add_pend_suspend(suspendee, BIF_P->id, handle_pend_bif_async_suspend); res = am_true; } /* done */ } /* --- Asynchronous suspend end ------------------------------------ */ } else /* if (!asynchronous) */ { /* --- Synchronous suspend begin ----------------------------------- */ ERTS_SMP_LC_ASSERT(((ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS) & erts_proc_lc_my_proc_locks(BIF_P)) == (ERTS_PROC_LOCK_LINK|ERTS_PROC_LOCK_STATUS)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS == erts_proc_lc_my_proc_locks(suspendee)); if (BIF_P->suspendee == BIF_ARG_1) { /* We are back after a yield and the suspendee has been suspended on behalf of us. */ ASSERT(smon->active >= 1); BIF_P->suspendee = NIL; res = (!unless_suspending || smon->active == 1 ? am_true : am_false); /* done */ } else if (smon->active) { if (unless_suspending) res = am_false; else { smon->active++; res = am_true; } /* done */ } else { /* We haven't got any active suspends on the suspendee */ /* * If we have pending suspenders and suspend ourselves waiting * to suspend another process, or suspend another process * we might deadlock. In this case we have to yield, * be suspended by someone else, and then do it all over again. */ if (BIF_P->pending_suspenders) goto yield; if (!unless_suspending && smon->pending == INT_MAX) goto system_limit; if (!unless_suspending || smon->pending == 0) smon->pending++; if (do_bif_suspend_process(BIF_P, smon, suspendee)) { res = (!unless_suspending || smon->active == 1 ? am_true : am_false); /* done */ } else { /* Mark suspendee pending for suspend by BIF_P */ add_pend_suspend(suspendee, BIF_P->id, handle_pend_bif_sync_suspend); ASSERT(is_nil(BIF_P->suspendee)); /* * Suspend BIF_P; when suspendee is suspended, BIF_P * will be resumed and this BIF will be called again. * This time with BIF_P->suspendee == BIF_ARG_1 (see * above). */ suspend_process(BIF_P, BIF_P); goto yield; } } /* --- Synchronous suspend end ------------------------------------- */ } #endif /* ERTS_SMP */ #ifdef DEBUG { erts_aint32_t state = erts_smp_atomic32_read_acqb(&suspendee->state); ASSERT((state & ERTS_PSFLG_SUSPENDED) || (asynchronous && smon->pending)); ASSERT((state & ERTS_PSFLG_SUSPENDED) || !smon->active); } #endif erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); erts_smp_proc_unlock(BIF_P, xlocks); BIF_RET(res); system_limit: ERTS_BIF_PREP_ERROR(res, BIF_P, SYSTEM_LIMIT); goto do_return; no_suspendee: #ifdef ERTS_SMP BIF_P->suspendee = NIL; #endif erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); badarg: ERTS_BIF_PREP_ERROR(res, BIF_P, BADARG); #ifdef ERTS_SMP goto do_return; yield: ERTS_BIF_PREP_YIELD2(res, bif_export[BIF_suspend_process_2], BIF_P, BIF_ARG_1, BIF_ARG_2); #endif do_return: if (suspendee) erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); if (xlocks) erts_smp_proc_unlock(BIF_P, xlocks); return res; } /* * The erlang:resume_process/1 BIF */ BIF_RETTYPE resume_process_1(BIF_ALIST_1) { ErtsSuspendMonitor *smon; Process *suspendee; int is_active; if (BIF_P->id == BIF_ARG_1) BIF_ERROR(BIF_P, BADARG); erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK); smon = erts_lookup_suspend_monitor(BIF_P->suspend_monitors, BIF_ARG_1); if (!smon) { /* No previous suspend or dead suspendee */ goto error; } else if (smon->pending) { smon->pending--; ASSERT(smon->pending >= 0); if (smon->active) { smon->active += smon->pending; smon->pending = 0; } is_active = smon->active; } else if (smon->active) { smon->active--; ASSERT(smon->pending >= 0); is_active = 1; } else { /* No previous suspend or dead suspendee */ goto error; } if (smon->active || smon->pending || !is_active) { /* Leave the suspendee as it is; just verify that it is still alive */ suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK, BIF_ARG_1, 0); if (!suspendee) goto no_suspendee; } else { /* Resume */ suspendee = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_LINK, BIF_ARG_1, ERTS_PROC_LOCK_STATUS); if (!suspendee) goto no_suspendee; ASSERT(ERTS_PSFLG_SUSPENDED & erts_smp_atomic32_read_nob(&suspendee->state)); resume_process(suspendee); erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); } if (!smon->active && !smon->pending) erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK); BIF_RET(am_true); no_suspendee: /* cleanup */ erts_delete_suspend_monitor(&BIF_P->suspend_monitors, BIF_ARG_1); error: erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK); BIF_ERROR(BIF_P, BADARG); } Uint erts_run_queues_len(Uint *qlen) { int i = 0; Uint len = 0; ERTS_ATOMIC_FOREACH_RUNQ(rq, { Sint pqlen = 0; int pix; for (pix = 0; pix < ERTS_NO_PROC_PRIO_LEVELS; pix++) pqlen += RUNQ_READ_LEN(&rq->procs.prio_info[pix].len); if (pqlen < 0) pqlen = 0; if (qlen) qlen[i++] = pqlen; len += pqlen; } ); return len; } Eterm erts_process_status(Process *c_p, ErtsProcLocks c_p_locks, Process *rp, Eterm rpid) { Eterm res = am_undefined; Process *p = rp ? rp : erts_proc_lookup_raw(rpid); if (p) { erts_aint32_t state = erts_smp_atomic32_read_acqb(&p->state); if (state & ERTS_PSFLG_FREE) res = am_free; else if (state & ERTS_PSFLG_EXITING) res = am_exiting; else if (state & ERTS_PSFLG_GC) res = am_garbage_collecting; else if (state & ERTS_PSFLG_SUSPENDED) res = am_suspended; else if (state & ERTS_PSFLG_RUNNING) res = am_running; else if (state & ERTS_PSFLG_ACTIVE) res = am_runnable; else res = am_waiting; } #ifdef ERTS_SMP else { int i; ErtsSchedulerData *esdp; for (i = 0; i < erts_no_schedulers; i++) { esdp = ERTS_SCHEDULER_IX(i); erts_smp_runq_lock(esdp->run_queue); if (esdp->free_process && esdp->free_process->id == rpid) { res = am_free; erts_smp_runq_unlock(esdp->run_queue); break; } erts_smp_runq_unlock(esdp->run_queue); } } #endif return res; } /* ** Suspend a currently executing process ** If we are to suspend on a port the busy_port is the thing ** otherwise busy_port is NIL */ void erts_suspend(Process* c_p, ErtsProcLocks c_p_locks, Port *busy_port) { #ifdef DEBUG int res; #endif ASSERT(c_p == erts_get_current_process()); ERTS_SMP_LC_ASSERT(c_p_locks == erts_proc_lc_my_proc_locks(c_p)); if (!(c_p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_STATUS); #ifdef DEBUG res = #endif suspend_process(c_p, c_p); ASSERT(res); if (busy_port) erts_wake_process_later(busy_port, c_p); if (!(c_p_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_STATUS); } void erts_resume(Process* process, ErtsProcLocks process_locks) { ERTS_SMP_LC_ASSERT(process_locks == erts_proc_lc_my_proc_locks(process)); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_lock(process, ERTS_PROC_LOCK_STATUS); resume_process(process); if (!(process_locks & ERTS_PROC_LOCK_STATUS)) erts_smp_proc_unlock(process, ERTS_PROC_LOCK_STATUS); } int erts_resume_processes(ErtsProcList *plp) { int nresumed = 0; while (plp) { Process *proc; ErtsProcList *fplp; ASSERT(is_internal_pid(plp->pid)); proc = erts_pid2proc(NULL, 0, plp->pid, ERTS_PROC_LOCK_STATUS); if (proc) { if (proclist_same(plp, proc)) { resume_process(proc); nresumed++; } erts_smp_proc_unlock(proc, ERTS_PROC_LOCK_STATUS); } fplp = plp; plp = plp->next; proclist_destroy(fplp); } return nresumed; } Eterm erts_get_process_priority(Process *p) { erts_aint32_t state = erts_smp_atomic32_read_nob(&p->state); switch (state & ERTS_PSFLG_PRIO_MASK) { case PRIORITY_MAX: return am_max; case PRIORITY_HIGH: return am_high; case PRIORITY_NORMAL: return am_normal; case PRIORITY_LOW: return am_low; default: ASSERT(0); return am_undefined; } } Eterm erts_set_process_priority(Process *p, Eterm value) { erts_aint32_t a, oprio, nprio; switch (value) { case am_max: nprio = (erts_aint32_t) PRIORITY_MAX; break; case am_high: nprio = (erts_aint32_t) PRIORITY_HIGH; break; case am_normal: nprio = (erts_aint32_t) PRIORITY_NORMAL; break; case am_low: nprio = (erts_aint32_t) PRIORITY_LOW; break; default: return THE_NON_VALUE; break; } a = erts_smp_atomic32_read_nob(&p->state); if (nprio == (a & ERTS_PSFLG_PRIO_MASK)) oprio = nprio; else { erts_aint32_t e, n; do { oprio = a & ERTS_PSFLG_PRIO_MASK; n = e = a; ASSERT(!(a & ERTS_PSFLG_IN_RUNQ)); n &= ~ERTS_PSFLG_PRIO_MASK; n |= nprio; a = erts_smp_atomic32_cmpxchg_mb(&p->state, n, e); } while (a != e); } switch (oprio) { case PRIORITY_MAX: return am_max; case PRIORITY_HIGH: return am_high; case PRIORITY_NORMAL: return am_normal; case PRIORITY_LOW: return am_low; default: ASSERT(0); return am_undefined; } } /* * schedule() is called from BEAM (process_main()) or HiPE * (hipe_mode_switch()) when the current process is to be * replaced by a new process. 'calls' is the number of reduction * steps the current process consumed. * schedule() returns the new process, and the new process' * ->fcalls field is initialised with its allowable number of * reduction steps. * * When no process is runnable, or when sufficiently many reduction * steps have been made, schedule() calls erl_sys_schedule() to * schedule system-level activities. * * We use the same queue for normal and low prio processes. * We reschedule low prio processes a certain number of times * so that normal processes get to run more frequently. */ Process *schedule(Process *p, int calls) { ErtsRunQueue *rq; erts_aint_t dt; ErtsSchedulerData *esdp; int context_reds; int fcalls; int input_reductions; int actual_reds; int reds; Uint32 flags; erts_aint32_t state = 0; /* Supress warning... */ #ifdef USE_VM_PROBES if (p != NULL && DTRACE_ENABLED(process_unscheduled)) { DTRACE_CHARBUF(process_buf, DTRACE_TERM_BUF_SIZE); dtrace_proc_str(p, process_buf); DTRACE1(process_unscheduled, process_buf); } #endif if (ERTS_USE_MODIFIED_TIMING()) { context_reds = ERTS_MODIFIED_TIMING_CONTEXT_REDS; input_reductions = ERTS_MODIFIED_TIMING_INPUT_REDS; } else { context_reds = CONTEXT_REDS; input_reductions = INPUT_REDUCTIONS; } ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking()); /* * Clean up after the process being scheduled out. */ if (!p) { /* NULL in the very first schedule() call */ esdp = erts_get_scheduler_data(); rq = erts_get_runq_current(esdp); ASSERT(esdp); fcalls = (int) erts_smp_atomic32_read_acqb(&function_calls); actual_reds = reds = 0; erts_smp_runq_lock(rq); } else { #ifdef ERTS_SMP ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); esdp = p->scheduler_data; ASSERT(esdp->current_process == p || esdp->free_process == p); #else esdp = erts_scheduler_data; ASSERT(esdp->current_process == p); #endif reds = actual_reds = calls - esdp->virtual_reds; if (reds < ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST) reds = ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST; esdp->virtual_reds = 0; fcalls = (int) erts_smp_atomic32_add_read_acqb(&function_calls, reds); ASSERT(esdp && esdp == erts_get_scheduler_data()); rq = erts_get_runq_current(esdp); p->reds += actual_reds; erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); state = erts_smp_atomic32_read_acqb(&p->state); if (IS_TRACED(p)) { if (IS_TRACED_FL(p, F_TRACE_CALLS) && !(state & ERTS_PSFLG_FREE)) { erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_OUT); } if (state & (ERTS_PSFLG_FREE|ERTS_PSFLG_EXITING)) { if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_EXIT)) trace_sched(p, ((state & ERTS_PSFLG_FREE) ? am_out_exited : am_out_exiting)); } else { if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED)) trace_sched(p, am_out); else if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_PROCS)) trace_virtual_sched(p, am_out); } } #ifdef ERTS_SMP if (state & ERTS_PSFLG_PENDING_EXIT) erts_handle_pending_exit(p, (ERTS_PROC_LOCK_MAIN | ERTS_PROC_LOCK_STATUS)); if (p->pending_suspenders) handle_pending_suspend(p, (ERTS_PROC_LOCK_MAIN | ERTS_PROC_LOCK_STATUS)); #endif schedule_out_process(rq, state, p); /* Returns with rq locked! */ ERTS_PROC_REDUCTIONS_EXECUTED(rq, (int) (state & ERTS_PSFLG_PRIO_MASK), reds, actual_reds); esdp->current_process = NULL; #ifdef ERTS_SMP p->scheduler_data = NULL; #endif if (state & ERTS_PSFLG_FREE) { #ifdef ERTS_SMP ASSERT(esdp->free_process == p); esdp->free_process = NULL; #else erts_free_proc(p); #endif } erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); #ifdef ERTS_SMP ASSERT(!esdp->free_process); #endif ASSERT(!esdp->current_process); ERTS_SMP_CHK_NO_PROC_LOCKS; dt = erts_do_time_read_and_reset(); if (dt) { erts_smp_runq_unlock(rq); erts_bump_timer(dt); erts_smp_runq_lock(rq); } BM_STOP_TIMER(system); } ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking()); check_activities_to_run: { #ifdef ERTS_SMP ErtsMigrationPaths *mps; ErtsMigrationPath *mp; #ifdef ERTS_SMP { ErtsProcList *pnd_xtrs = rq->procs.pending_exiters; rq->procs.pending_exiters = NULL; if (pnd_xtrs) { erts_smp_runq_unlock(rq); handle_pending_exiters(pnd_xtrs); erts_smp_runq_lock(rq); } } #endif if (rq->check_balance_reds <= 0) check_balance(rq); ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking()); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); mps = erts_get_migration_paths_managed(); mp = &mps->mpath[rq->ix]; if (mp->flags & ERTS_RUNQ_FLGS_IMMIGRATE_QMASK) immigrate(rq, mp); continue_check_activities_to_run: flags = ERTS_RUNQ_FLGS_GET_NOB(rq); continue_check_activities_to_run_known_flags: if (flags & (ERTS_RUNQ_FLG_CHK_CPU_BIND|ERTS_RUNQ_FLG_SUSPENDED)) { if (flags & ERTS_RUNQ_FLG_SUSPENDED) { suspend_scheduler(esdp); flags = ERTS_RUNQ_FLGS_GET_NOB(rq); } if (flags & ERTS_RUNQ_FLG_CHK_CPU_BIND) { flags = ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_CHK_CPU_BIND); flags &= ~ ERTS_RUNQ_FLG_CHK_CPU_BIND; erts_sched_check_cpu_bind(esdp); } } { erts_aint32_t aux_work; int leader_update = erts_thr_progress_update(esdp); aux_work = erts_atomic32_read_acqb(&esdp->ssi->aux_work); if (aux_work | leader_update) { erts_smp_runq_unlock(rq); if (leader_update) erts_thr_progress_leader_update(esdp); if (aux_work) handle_aux_work(&esdp->aux_work_data, aux_work, 0); erts_smp_runq_lock(rq); } } ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking()); ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); #else /* ERTS_SMP */ { erts_aint32_t aux_work; aux_work = erts_atomic32_read_acqb(&esdp->ssi->aux_work); if (aux_work) handle_aux_work(&esdp->aux_work_data, aux_work, 0); } #endif /* ERTS_SMP */ flags = ERTS_RUNQ_FLGS_GET_NOB(rq); if ((!(flags & ERTS_RUNQ_FLGS_QMASK) && !rq->misc.start) || (rq->halt_in_progress && ERTS_EMPTY_RUNQ_PORTS(rq))) { /* Prepare for scheduler wait */ #ifdef ERTS_SMP ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq)); rq->wakeup_other = 0; rq->wakeup_other_reds = 0; empty_runq(rq); flags = ERTS_RUNQ_FLGS_GET_NOB(rq); if (flags & ERTS_RUNQ_FLG_SUSPENDED) { non_empty_runq(rq); goto continue_check_activities_to_run_known_flags; } else if (!(flags & ERTS_RUNQ_FLG_INACTIVE)) { if (try_steal_task(rq)) { non_empty_runq(rq); goto continue_check_activities_to_run; } (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_PROTECTED); /* * Check for ERTS_RUNQ_FLG_SUSPENDED has to be done * after trying to steal a task. */ flags = ERTS_RUNQ_FLGS_GET_NOB(rq); if (flags & ERTS_RUNQ_FLG_SUSPENDED) { non_empty_runq(rq); goto continue_check_activities_to_run_known_flags; } } #endif scheduler_wait(&fcalls, esdp, rq); #ifdef ERTS_SMP non_empty_runq(rq); #endif goto check_activities_to_run; } else if (fcalls > input_reductions && prepare_for_sys_schedule()) { /* * Schedule system-level activities. */ erts_smp_atomic32_set_relb(&function_calls, 0); fcalls = 0; ASSERT(!erts_port_task_have_outstanding_io_tasks()); #if 0 /* Not needed since we wont wait in sys schedule */ erts_sys_schedule_interrupt(0); #endif erts_smp_runq_unlock(rq); erl_sys_schedule(1); dt = erts_do_time_read_and_reset(); if (dt) erts_bump_timer(dt); #ifdef ERTS_SMP erts_smp_runq_lock(rq); clear_sys_scheduling(); goto continue_check_activities_to_run; #else goto check_activities_to_run; #endif } if (rq->misc.start) exec_misc_ops(rq); #ifdef ERTS_SMP wakeup_other.check(rq, flags); #endif /* * Find a new port to run. */ if (RUNQ_READ_LEN(&rq->ports.info.len)) { int have_outstanding_io; have_outstanding_io = erts_port_task_execute(rq, &esdp->current_port); if ((have_outstanding_io && fcalls > 2*input_reductions) || rq->halt_in_progress) { /* * If we have performed more than 2*INPUT_REDUCTIONS since * last call to erl_sys_schedule() and we still haven't * handled all I/O tasks we stop running processes and * focus completely on ports. * * One could argue that this is a strange behavior. The * reason for doing it this way is that it is similar * to the behavior before port tasks were introduced. * We don't want to change the behavior too much, at * least not at the time of writing. This behavior * might change in the future. * * /rickard */ goto check_activities_to_run; } } /* * Find a new process to run. */ pick_next_process: { int prio_q; int qmask; flags = ERTS_RUNQ_FLGS_GET_NOB(rq); qmask = (int) (flags & ERTS_RUNQ_FLGS_PROCS_QMASK); switch (qmask & -qmask) { case MAX_BIT: prio_q = PRIORITY_MAX; break; case HIGH_BIT: prio_q = PRIORITY_HIGH; break; case NORMAL_BIT: case LOW_BIT: prio_q = PRIORITY_NORMAL; if (check_requeue_process(rq, PRIORITY_NORMAL)) goto pick_next_process; break; case 0: /* No process at all */ default: ASSERT(qmask == 0); goto check_activities_to_run; } BM_START_TIMER(system); /* * Take the chosen process out of the queue. */ p = dequeue_process(rq, prio_q, &state); ASSERT(p); /* Wrong qmask in rq->flags? */ while (1) { erts_aint32_t exp, new, tmp; tmp = new = exp = state; new &= ~ERTS_PSFLG_IN_RUNQ; tmp = state & (ERTS_PSFLG_SUSPENDED|ERTS_PSFLG_PENDING_EXIT); if (tmp != ERTS_PSFLG_SUSPENDED) new |= ERTS_PSFLG_RUNNING; state = erts_smp_atomic32_cmpxchg_relb(&p->state, new, exp); if (state == exp) { tmp = state & (ERTS_PSFLG_SUSPENDED|ERTS_PSFLG_PENDING_EXIT); if (tmp == ERTS_PSFLG_SUSPENDED) goto pick_next_process; state = new; break; } } rq->procs.context_switches++; esdp->current_process = p; } #ifdef ERTS_SMP erts_smp_runq_unlock(rq); if (flags & ERTS_RUNQ_FLG_PROTECTED) (void) ERTS_RUNQ_FLGS_UNSET(rq, ERTS_RUNQ_FLG_PROTECTED); ERTS_SMP_CHK_NO_PROC_LOCKS; erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); if (erts_sched_stat.enabled) { int prio; UWord old = ERTS_PROC_SCHED_ID(p, (ERTS_PROC_LOCK_MAIN | ERTS_PROC_LOCK_STATUS), (UWord) esdp->no); int migrated = old && old != esdp->no; prio = (int) (state & ERTS_PSFLG_PRIO_MASK); erts_smp_spin_lock(&erts_sched_stat.lock); erts_sched_stat.prio[prio].total_executed++; erts_sched_stat.prio[prio].executed++; if (migrated) { erts_sched_stat.prio[prio].total_migrated++; erts_sched_stat.prio[prio].migrated++; } erts_smp_spin_unlock(&erts_sched_stat.lock); } if (ERTS_PROC_PENDING_EXIT(p)) { erts_handle_pending_exit(p, ERTS_PROC_LOCK_MAIN|ERTS_PROC_LOCK_STATUS); state = erts_smp_atomic32_read_nob(&p->state); } ASSERT(!p->scheduler_data); p->scheduler_data = esdp; #endif /* Never run a suspended process */ ASSERT(!(ERTS_PSFLG_SUSPENDED & erts_smp_atomic32_read_nob(&p->state))); reds = context_reds; if (IS_TRACED(p)) { if (state & ERTS_PSFLG_EXITING) { if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_EXIT)) trace_sched(p, am_in_exiting); } else { if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED)) trace_sched(p, am_in); else if (ARE_TRACE_FLAGS_ON(p, F_TRACE_SCHED_PROCS)) trace_virtual_sched(p, am_in); } if (IS_TRACED_FL(p, F_TRACE_CALLS)) { erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_IN); } } erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); #ifdef ERTS_SMP if (is_not_nil(p->tracer_proc)) erts_check_my_tracer_proc(p); #endif if (!(state & ERTS_PSFLG_EXITING) && ((FLAGS(p) & F_FORCE_GC) || (MSO(p).overhead > BIN_VHEAP_SZ(p)))) { reds -= erts_garbage_collect(p, 0, p->arg_reg, p->arity); if (reds < 0) { reds = 1; } } p->fcalls = reds; ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); return p; } } void erts_sched_stat_modify(int what) { int ix; switch (what) { case ERTS_SCHED_STAT_MODIFY_ENABLE: erts_smp_thr_progress_block(); erts_sched_stat.enabled = 1; erts_smp_thr_progress_unblock(); break; case ERTS_SCHED_STAT_MODIFY_DISABLE: erts_smp_thr_progress_block(); erts_sched_stat.enabled = 1; erts_smp_thr_progress_unblock(); break; case ERTS_SCHED_STAT_MODIFY_CLEAR: erts_smp_spin_lock(&erts_sched_stat.lock); for (ix = 0; ix < ERTS_NO_PRIO_LEVELS; ix++) { erts_sched_stat.prio[ix].total_executed = 0; erts_sched_stat.prio[ix].executed = 0; erts_sched_stat.prio[ix].total_migrated = 0; erts_sched_stat.prio[ix].migrated = 0; } erts_smp_spin_unlock(&erts_sched_stat.lock); break; } } Eterm erts_sched_stat_term(Process *p, int total) { Uint sz; Uint *hp; Eterm prio[ERTS_NO_PRIO_LEVELS]; Uint executed[ERTS_NO_PRIO_LEVELS]; Uint migrated[ERTS_NO_PRIO_LEVELS]; erts_smp_spin_lock(&erts_sched_stat.lock); if (total) { int i; for (i = 0; i < ERTS_NO_PRIO_LEVELS; i++) { prio[i] = erts_sched_stat.prio[i].name; executed[i] = erts_sched_stat.prio[i].total_executed; migrated[i] = erts_sched_stat.prio[i].total_migrated; } } else { int i; for (i = 0; i < ERTS_NO_PRIO_LEVELS; i++) { prio[i] = erts_sched_stat.prio[i].name; executed[i] = erts_sched_stat.prio[i].executed; erts_sched_stat.prio[i].executed = 0; migrated[i] = erts_sched_stat.prio[i].migrated; erts_sched_stat.prio[i].migrated = 0; } } erts_smp_spin_unlock(&erts_sched_stat.lock); sz = 0; (void) erts_bld_atom_2uint_3tup_list(NULL, &sz, ERTS_NO_PRIO_LEVELS, prio, executed, migrated); hp = HAlloc(p, sz); return erts_bld_atom_2uint_3tup_list(&hp, NULL, ERTS_NO_PRIO_LEVELS, prio, executed, migrated); } /* * Scheduling of misc stuff */ void erts_schedule_misc_op(void (*func)(void *), void *arg) { ErtsSchedulerData *esdp = erts_get_scheduler_data(); ErtsRunQueue *rq = esdp ? esdp->run_queue : ERTS_RUNQ_IX(0); ErtsMiscOpList *molp = misc_op_list_alloc(); #ifdef ERTS_SMP ErtsMigrationPaths *mpaths = erts_get_migration_paths(); if (!mpaths) rq = ERTS_RUNQ_IX(0); else { ErtsRunQueue *erq = mpaths->mpath[rq->ix].misc_evac_runq; if (erq) rq = erq; } #endif erts_smp_runq_lock(rq); molp->next = NULL; molp->func = func; molp->arg = arg; if (rq->misc.end) rq->misc.end->next = molp; else rq->misc.start = molp; rq->misc.end = molp; erts_smp_runq_unlock(rq); smp_notify_inc_runq(rq); } static void exec_misc_ops(ErtsRunQueue *rq) { int i; ErtsMiscOpList *molp = rq->misc.start; ErtsMiscOpList *tmp_molp = molp; for (i = 0; i < ERTS_MAX_MISC_OPS-1; i++) { if (!tmp_molp) goto mtq; tmp_molp = tmp_molp->next; } if (!tmp_molp) { mtq: rq->misc.start = NULL; rq->misc.end = NULL; } else { rq->misc.start = tmp_molp->next; tmp_molp->next = NULL; if (!rq->misc.start) rq->misc.end = NULL; } erts_smp_runq_unlock(rq); while (molp) { tmp_molp = molp; (*molp->func)(molp->arg); molp = molp->next; misc_op_list_free(tmp_molp); } erts_smp_runq_lock(rq); } Uint erts_get_total_context_switches(void) { Uint res = 0; ERTS_ATOMIC_FOREACH_RUNQ(rq, res += rq->procs.context_switches); return res; } void erts_get_total_reductions(Uint *redsp, Uint *diffp) { Uint reds = 0; ERTS_ATOMIC_FOREACH_RUNQ_X(rq, reds += rq->procs.reductions, if (redsp) *redsp = reds; if (diffp) *diffp = reds - last_reductions; last_reductions = reds); } void erts_get_exact_total_reductions(Process *c_p, Uint *redsp, Uint *diffp) { Uint reds = erts_current_reductions(c_p, c_p); int ix; erts_smp_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN); /* * Wait for other schedulers to schedule out their processes * and update 'reductions'. */ erts_smp_thr_progress_block(); for (reds = 0, ix = 0; ix < erts_no_run_queues; ix++) reds += ERTS_RUNQ_IX(ix)->procs.reductions; if (redsp) *redsp = reds; if (diffp) *diffp = reds - last_exact_reductions; last_exact_reductions = reds; erts_smp_thr_progress_unblock(); erts_smp_proc_lock(c_p, ERTS_PROC_LOCK_MAIN); } /* * erts_test_next_pid() is only used for testing. */ Sint erts_test_next_pid(int set, Uint next) { Uint64 lpd; Sint res; Eterm pid_data; int first_pix = -1; erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); if (!set) lpd = last_pid_data_read_nob(); else { lpd = (Uint64) next; pid_data = (Eterm) (lpd & ERTS_PID_DATA_MASK__); if (ERTS_INVALID_PID == make_internal_pid(pid_data)) { lpd += erts_proc.max; ASSERT(erts_pid_data2ix(pid_data) == erts_pid_data2ix(lpd & ERTS_PID_DATA_MASK__)); } last_pid_data_set_relb(lpd); } while (1) { int pix; lpd++; pix = (int) (lpd % erts_proc.max); if (first_pix < 0) first_pix = pix; else if (pix == first_pix) { res = -1; break; } if (ERTS_AINT_NULL == erts_smp_atomic_read_nob(&erts_proc.tab[pix])) { pid_data = (Eterm) (lpd & ERTS_PID_DATA_MASK__); if (ERTS_INVALID_PID == make_internal_pid(pid_data)) { lpd += erts_proc.max; ASSERT(erts_pid_data2ix(pid_data) == erts_pid_data2ix(lpd & ERTS_PID_DATA_MASK__)); } res = lpd & ERTS_PID_DATA_MASK__; break; } } erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); return res; } Uint erts_process_count(void) { erts_aint32_t res = erts_smp_atomic32_read_nob(&process_count); if (res > erts_proc.max) return erts_proc.max; ASSERT(res >= 0); return (Uint) res; } void erts_free_proc(Process *p) { #ifdef ERTS_SMP erts_proc_lock_fin(p); #endif erts_free(ERTS_ALC_T_PROC, (void *) p); } /* ** Allocate process and find out where to place next process. */ static Process* alloc_process(ErtsRunQueue *rq, erts_aint32_t state) { int pix; Process* p; Uint64 lpd, exp_lpd; Eterm pid_data; erts_aint32_t proc_count; #ifdef DEBUG Eterm pid; #endif erts_smp_rwmtx_rlock(&erts_proc_tab_rwmtx); proc_count = erts_smp_atomic32_inc_read_acqb(&process_count); if (proc_count > erts_proc.max) { while (1) { erts_aint32_t act_proc_count; act_proc_count = erts_smp_atomic32_cmpxchg_relb(&process_count, proc_count-1, proc_count); if (act_proc_count == proc_count) goto system_limit; proc_count = act_proc_count; if (proc_count <= erts_proc.max) break; } } p = (Process*) erts_alloc_fnf(ERTS_ALC_T_PROC, sizeof(Process)); if (!p) goto enomem; p->approx_started = erts_get_approx_time(); p->started_interval = get_proc_interval(); lpd = last_pid_data_read_acqb(); /* Reserve slot */ while (1) { lpd++; pix = erts_pid_data2ix((Eterm) (lpd & ERTS_PID_DATA_MASK__)); if (erts_smp_atomic_read_nob(&erts_proc.tab[pix]) == ERTS_AINT_NULL) { erts_aint_t val; val = erts_smp_atomic_cmpxchg_relb(&erts_proc.tab[pix], ((erts_aint_t) ERTS_PROC_LOCK_BUSY), ERTS_AINT_NULL); if (ERTS_AINT_NULL == val) break; } } pid_data = (Eterm) lpd & ERTS_PID_DATA_MASK__; p->id = make_internal_pid(pid_data); if (p->id == ERTS_INVALID_PID) { /* Do not use the invalid pid; change serial */ lpd += erts_proc.max; ASSERT(pix == erts_pid_data2ix((Eterm) (lpd & ERTS_PID_DATA_MASK__))); pid_data = (Eterm) lpd & ERTS_PID_DATA_MASK__; p->id = make_internal_pid(pid_data); ASSERT(p->id != ERTS_INVALID_PID); } exp_lpd = last_pid_data_read_nob(); /* Move last pid data forward */ while (1) { Uint64 act_lpd; if (last_pid_data_cmp(lpd, exp_lpd) < 0) break; act_lpd = last_pid_data_cmpxchg_relb(lpd, exp_lpd); if (act_lpd == exp_lpd) break; exp_lpd = act_lpd; } #ifdef ERTS_SMP RUNQ_SET_RQ(&p->run_queue, rq); #endif erts_smp_atomic32_init_relb(&p->state, state); #ifdef DEBUG pid = p->id; #endif #ifdef ERTS_SMP erts_proc_lock_init(p); /* All locks locked */ #endif /* Move into slot reserved */ #ifdef DEBUG ASSERT(ERTS_PROC_LOCK_BUSY == (Process *) erts_smp_atomic_xchg_relb(&erts_proc.tab[pix], (erts_aint_t) p)); #else erts_smp_atomic_set_relb(&erts_proc.tab[pix], (erts_aint_t) p); #endif ASSERT(internal_pid_serial(p->id) <= (erts_use_r9_pids_ports ? ERTS_MAX_PID_R9_SERIAL : ERTS_MAX_PID_SERIAL)); erts_smp_rwmtx_runlock(&erts_proc_tab_rwmtx); p->rcount = 0; ASSERT(p == (Process *) erts_smp_atomic_read_nob( &erts_proc.tab[internal_pid_index(pid)])); return p; enomem: system_limit: erts_smp_rwmtx_runlock(&erts_proc_tab_rwmtx); return NULL; } Eterm erl_create_process(Process* parent, /* Parent of process (default group leader). */ Eterm mod, /* Tagged atom for module. */ Eterm func, /* Tagged atom for function. */ Eterm args, /* Arguments for function (must be well-formed list). */ ErlSpawnOpts* so) /* Options for spawn. */ { ErtsRunQueue *rq = NULL; Process *p; Sint arity; /* Number of arguments. */ Uint arg_size; /* Size of arguments. */ Uint sz; /* Needed words on heap. */ Uint heap_need; /* Size needed on heap. */ Eterm res = THE_NON_VALUE; erts_aint32_t state = 0; erts_aint32_t prio = (erts_aint32_t) PRIORITY_NORMAL; #ifdef ERTS_SMP erts_smp_proc_lock(parent, ERTS_PROC_LOCKS_ALL_MINOR); #endif /* * Check for errors. */ if (is_not_atom(mod) || is_not_atom(func) || ((arity = list_length(args)) < 0)) { so->error_code = BADARG; goto error; } if (so->flags & SPO_USE_ARGS) { if (so->scheduler) { int ix = so->scheduler-1; ASSERT(0 <= ix && ix < erts_no_run_queues); rq = ERTS_RUNQ_IX(ix); state |= ERTS_PSFLG_BOUND; } prio = (erts_aint32_t) so->priority; } state |= (prio & ERTS_PSFLG_PRIO_MASK); if (!rq) rq = erts_get_runq_proc(parent); p = alloc_process(rq, state); /* All proc locks are locked by this thread on success */ if (!p) { erts_send_error_to_logger_str(parent->group_leader, "Too many processes\n"); so->error_code = SYSTEM_LIMIT; goto error; } #ifdef BM_COUNTERS processes_busy++; #endif BM_COUNT(processes_spawned); BM_SWAP_TIMER(system,size); arg_size = size_object(args); BM_SWAP_TIMER(size,system); heap_need = arg_size; p->flags = erts_default_process_flags; if (so->flags & SPO_USE_ARGS) { p->min_heap_size = so->min_heap_size; p->min_vheap_size = so->min_vheap_size; p->max_gen_gcs = so->max_gen_gcs; } else { p->min_heap_size = H_MIN_SIZE; p->min_vheap_size = BIN_VH_MIN_SIZE; p->max_gen_gcs = (Uint16) erts_smp_atomic32_read_nob(&erts_max_gen_gcs); } p->schedule_count = 0; ASSERT(p->min_heap_size == erts_next_heap_size(p->min_heap_size, 0)); p->initial[INITIAL_MOD] = mod; p->initial[INITIAL_FUN] = func; p->initial[INITIAL_ARI] = (Uint) arity; /* * Must initialize binary lists here before copying binaries to process. */ p->off_heap.first = NULL; p->off_heap.overhead = 0; heap_need += IS_CONST(parent->group_leader) ? 0 : NC_HEAP_SIZE(parent->group_leader); if (heap_need < p->min_heap_size) { sz = heap_need = p->min_heap_size; } else { sz = erts_next_heap_size(heap_need, 0); } #ifdef HIPE hipe_init_process(&p->hipe); #ifdef ERTS_SMP hipe_init_process_smp(&p->hipe_smp); #endif #endif p->heap = (Eterm *) ERTS_HEAP_ALLOC(ERTS_ALC_T_HEAP, sizeof(Eterm)*sz); p->old_hend = p->old_htop = p->old_heap = NULL; p->high_water = p->heap; p->gen_gcs = 0; p->stop = p->hend = p->heap + sz; p->htop = p->heap; p->heap_sz = sz; p->catches = 0; p->bin_vheap_sz = p->min_vheap_size; p->bin_old_vheap_sz = p->min_vheap_size; p->bin_old_vheap = 0; p->bin_vheap_mature = 0; /* No need to initialize p->fcalls. */ p->current = p->initial+INITIAL_MOD; p->i = (BeamInstr *) beam_apply; p->cp = (BeamInstr *) beam_apply+1; p->arg_reg = p->def_arg_reg; p->max_arg_reg = sizeof(p->def_arg_reg)/sizeof(p->def_arg_reg[0]); p->arg_reg[0] = mod; p->arg_reg[1] = func; BM_STOP_TIMER(system); BM_MESSAGE(args,p,parent); BM_START_TIMER(system); BM_SWAP_TIMER(system,copy); p->arg_reg[2] = copy_struct(args, arg_size, &p->htop, &p->off_heap); BM_MESSAGE_COPIED(arg_size); BM_SWAP_TIMER(copy,system); p->arity = 3; p->fvalue = NIL; p->freason = EXC_NULL; p->ftrace = NIL; p->reds = 0; #ifdef ERTS_SMP p->u.alive.ptimer = NULL; #else sys_memset(&p->u.alive.tm, 0, sizeof(ErlTimer)); #endif p->reg = NULL; p->nlinks = NULL; p->monitors = NULL; p->nodes_monitors = NULL; p->suspend_monitors = NULL; ASSERT(is_pid(parent->group_leader)); if (parent->group_leader == ERTS_INVALID_PID) p->group_leader = p->id; else { /* Needs to be done after the heap has been set up */ p->group_leader = IS_CONST(parent->group_leader) ? parent->group_leader : STORE_NC(&p->htop, &p->off_heap, parent->group_leader); } erts_get_default_tracing(&p->trace_flags, &p->tracer_proc); p->msg.first = NULL; p->msg.last = &p->msg.first; p->msg.save = &p->msg.first; p->msg.len = 0; #ifdef ERTS_SMP p->u.alive.msg_inq.first = NULL; p->u.alive.msg_inq.last = &p->u.alive.msg_inq.first; p->u.alive.msg_inq.len = 0; #endif p->bif_timers = NULL; p->mbuf = NULL; p->mbuf_sz = 0; p->psd = NULL; p->dictionary = NULL; p->seq_trace_lastcnt = 0; p->seq_trace_clock = 0; SEQ_TRACE_TOKEN(p) = NIL; #ifdef USE_VM_PROBES DT_UTAG(p) = NIL; DT_UTAG_FLAGS(p) = 0; #endif p->parent = parent->id == ERTS_INVALID_PID ? NIL : parent->id; INIT_HOLE_CHECK(p); #ifdef DEBUG p->last_old_htop = NULL; #endif if (IS_TRACED(parent)) { if (parent->trace_flags & F_TRACE_SOS) { p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; } if (ARE_TRACE_FLAGS_ON(parent, F_TRACE_PROCS)) { trace_proc_spawn(parent, p->id, mod, func, args); } if (parent->trace_flags & F_TRACE_SOS1) { /* Overrides TRACE_CHILDREN */ p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; p->trace_flags &= ~(F_TRACE_SOS1 | F_TRACE_SOS); parent->trace_flags &= ~(F_TRACE_SOS1 | F_TRACE_SOS); } } /* * Check if this process should be initially linked to its parent. */ if (so->flags & SPO_LINK) { #ifdef DEBUG int ret; #endif if (IS_TRACED_FL(parent, F_TRACE_PROCS)) { trace_proc(parent, parent, am_link, p->id); } #ifdef DEBUG ret = erts_add_link(&(parent->nlinks), LINK_PID, p->id); ASSERT(ret == 0); ret = erts_add_link(&(p->nlinks), LINK_PID, parent->id); ASSERT(ret == 0); #else erts_add_link(&(parent->nlinks), LINK_PID, p->id); erts_add_link(&(p->nlinks), LINK_PID, parent->id); #endif if (IS_TRACED(parent)) { if (parent->trace_flags & (F_TRACE_SOL|F_TRACE_SOL1)) { p->trace_flags |= (parent->trace_flags & TRACEE_FLAGS); p->tracer_proc = parent->tracer_proc; /* maybe steal */ if (parent->trace_flags & F_TRACE_SOL1) { /* maybe override */ p ->trace_flags &= ~(F_TRACE_SOL1 | F_TRACE_SOL); parent->trace_flags &= ~(F_TRACE_SOL1 | F_TRACE_SOL); } } } } /* * Test whether this process should be initially monitored by its parent. */ if (so->flags & SPO_MONITOR) { Eterm mref; mref = erts_make_ref(parent); erts_add_monitor(&(parent->monitors), MON_ORIGIN, mref, p->id, NIL); erts_add_monitor(&(p->monitors), MON_TARGET, mref, parent->id, NIL); so->mref = mref; } #ifdef ERTS_SMP p->scheduler_data = NULL; p->suspendee = NIL; p->pending_suspenders = NULL; p->u.alive.pending_exit.reason = THE_NON_VALUE; p->u.alive.pending_exit.bp = NULL; #endif #if !defined(NO_FPE_SIGNALS) || defined(HIPE) p->fp_exception = 0; #endif erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); res = p->id; /* * Schedule process for execution. */ schedule_process(p, state, 0); VERBOSE(DEBUG_PROCESSES, ("Created a new process: %T\n",p->id)); #ifdef USE_VM_PROBES if (DTRACE_ENABLED(process_spawn)) { DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); DTRACE_CHARBUF(mfa, DTRACE_TERM_BUF_SIZE); dtrace_fun_decode(p, mod, func, arity, process_name, mfa); DTRACE2(process_spawn, process_name, mfa); } #endif error: erts_smp_proc_unlock(parent, ERTS_PROC_LOCKS_ALL_MINOR); return res; } /* * Initiates a pseudo process that can be used * for arithmetic BIFs. */ void erts_init_empty_process(Process *p) { p->htop = NULL; p->stop = NULL; p->hend = NULL; p->heap = NULL; p->gen_gcs = 0; p->max_gen_gcs = 0; p->min_heap_size = 0; p->min_vheap_size = 0; p->rcount = 0; p->id = ERTS_INVALID_PID; p->reds = 0; p->tracer_proc = NIL; p->trace_flags = F_INITIAL_TRACE_FLAGS; p->group_leader = ERTS_INVALID_PID; p->flags = 0; p->fvalue = NIL; p->freason = EXC_NULL; p->ftrace = NIL; p->fcalls = 0; p->bin_vheap_sz = BIN_VH_MIN_SIZE; p->bin_old_vheap_sz = BIN_VH_MIN_SIZE; p->bin_old_vheap = 0; p->bin_vheap_mature = 0; #ifdef ERTS_SMP p->u.alive.ptimer = NULL; #else memset(&(p->u.alive.tm), 0, sizeof(ErlTimer)); #endif p->next = NULL; p->off_heap.first = NULL; p->off_heap.overhead = 0; p->reg = NULL; p->heap_sz = 0; p->high_water = NULL; p->old_hend = NULL; p->old_htop = NULL; p->old_heap = NULL; p->mbuf = NULL; p->mbuf_sz = 0; p->psd = NULL; p->monitors = NULL; p->nlinks = NULL; /* List of links */ p->nodes_monitors = NULL; p->suspend_monitors = NULL; p->msg.first = NULL; p->msg.last = &p->msg.first; p->msg.save = &p->msg.first; p->msg.len = 0; p->bif_timers = NULL; p->dictionary = NULL; p->seq_trace_clock = 0; p->seq_trace_lastcnt = 0; p->seq_trace_token = NIL; p->initial[0] = 0; p->initial[1] = 0; p->initial[2] = 0; p->catches = 0; p->cp = NULL; p->i = NULL; p->current = NULL; /* * Saved x registers. */ p->arity = 0; p->arg_reg = NULL; p->max_arg_reg = 0; p->def_arg_reg[0] = 0; p->def_arg_reg[1] = 0; p->def_arg_reg[2] = 0; p->def_arg_reg[3] = 0; p->def_arg_reg[4] = 0; p->def_arg_reg[5] = 0; p->parent = NIL; p->approx_started = 0; p->started_interval = 0; #ifdef HIPE hipe_init_process(&p->hipe); #ifdef ERTS_SMP hipe_init_process_smp(&p->hipe_smp); #endif #endif INIT_HOLE_CHECK(p); #ifdef DEBUG p->last_old_htop = NULL; #endif erts_smp_atomic32_init_nob(&p->state, (erts_aint32_t) PRIORITY_NORMAL); #ifdef ERTS_SMP p->scheduler_data = NULL; p->u.alive.msg_inq.first = NULL; p->u.alive.msg_inq.last = &p->u.alive.msg_inq.first; p->u.alive.msg_inq.len = 0; p->suspendee = NIL; p->pending_suspenders = NULL; p->u.alive.pending_exit.reason = THE_NON_VALUE; p->u.alive.pending_exit.bp = NULL; erts_proc_lock_init(p); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); RUNQ_SET_RQ(&p->run_queue, ERTS_RUNQ_IX(0)); #endif #if !defined(NO_FPE_SIGNALS) || defined(HIPE) p->fp_exception = 0; #endif } #ifdef DEBUG void erts_debug_verify_clean_empty_process(Process* p) { /* Things that erts_cleanup_empty_process() will *not* cleanup... */ ASSERT(p->htop == NULL); ASSERT(p->stop == NULL); ASSERT(p->hend == NULL); ASSERT(p->heap == NULL); ASSERT(p->id == ERTS_INVALID_PID); ASSERT(p->tracer_proc == NIL); ASSERT(p->trace_flags == F_INITIAL_TRACE_FLAGS); ASSERT(p->group_leader == ERTS_INVALID_PID); ASSERT(p->next == NULL); ASSERT(p->reg == NULL); ASSERT(p->heap_sz == 0); ASSERT(p->high_water == NULL); ASSERT(p->old_hend == NULL); ASSERT(p->old_htop == NULL); ASSERT(p->old_heap == NULL); ASSERT(p->monitors == NULL); ASSERT(p->nlinks == NULL); ASSERT(p->nodes_monitors == NULL); ASSERT(p->suspend_monitors == NULL); ASSERT(p->msg.first == NULL); ASSERT(p->msg.len == 0); ASSERT(p->bif_timers == NULL); ASSERT(p->dictionary == NULL); ASSERT(p->catches == 0); ASSERT(p->cp == NULL); ASSERT(p->i == NULL); ASSERT(p->current == NULL); ASSERT(p->parent == NIL); #ifdef ERTS_SMP ASSERT(p->u.alive.msg_inq.first == NULL); ASSERT(p->u.alive.msg_inq.len == 0); ASSERT(p->suspendee == NIL); ASSERT(p->pending_suspenders == NULL); ASSERT(p->u.alive.pending_exit.reason == THE_NON_VALUE); ASSERT(p->u.alive.pending_exit.bp == NULL); #endif /* Thing that erts_cleanup_empty_process() cleans up */ ASSERT(p->off_heap.first == NULL); ASSERT(p->off_heap.overhead == 0); ASSERT(p->mbuf == NULL); } #endif void erts_cleanup_empty_process(Process* p) { /* We only check fields that are known to be used... */ erts_cleanup_offheap(&p->off_heap); p->off_heap.first = NULL; p->off_heap.overhead = 0; if (p->mbuf != NULL) { free_message_buffer(p->mbuf); p->mbuf = NULL; } #ifdef ERTS_SMP erts_proc_lock_fin(p); #endif #ifdef DEBUG erts_debug_verify_clean_empty_process(p); #endif } /* * p must be the currently executing process. */ static void delete_process(Process* p) { ErlMessage* mp; VERBOSE(DEBUG_PROCESSES, ("Removing process: %T\n",p->id)); /* Cleanup psd */ if (p->psd) erts_free(ERTS_ALC_T_PSD, p->psd); /* Clean binaries and funs */ erts_cleanup_offheap(&p->off_heap); /* * The mso list should not be used anymore, but if it is, make sure that * we'll notice. */ p->off_heap.first = (void *) 0x8DEFFACD; if (p->arg_reg != p->def_arg_reg) { erts_free(ERTS_ALC_T_ARG_REG, p->arg_reg); } /* * Release heaps. Clobber contents in DEBUG build. */ #ifdef DEBUG sys_memset(p->heap, DEBUG_BAD_BYTE, p->heap_sz*sizeof(Eterm)); #endif #ifdef HIPE hipe_delete_process(&p->hipe); #endif ERTS_HEAP_FREE(ERTS_ALC_T_HEAP, (void*) p->heap, p->heap_sz*sizeof(Eterm)); if (p->old_heap != NULL) { #ifdef DEBUG sys_memset(p->old_heap, DEBUG_BAD_BYTE, (p->old_hend-p->old_heap)*sizeof(Eterm)); #endif ERTS_HEAP_FREE(ERTS_ALC_T_OLD_HEAP, p->old_heap, (p->old_hend-p->old_heap)*sizeof(Eterm)); } /* * Free all pending message buffers. */ if (p->mbuf != NULL) { free_message_buffer(p->mbuf); } erts_erase_dicts(p); /* free all pending messages */ mp = p->msg.first; while(mp != NULL) { ErlMessage* next_mp = mp->next; if (mp->data.attached) { if (is_value(mp->m[0])) free_message_buffer(mp->data.heap_frag); else { if (is_not_nil(mp->m[1])) { ErlHeapFragment *heap_frag; heap_frag = (ErlHeapFragment *) mp->data.dist_ext->ext_endp; erts_cleanup_offheap(&heap_frag->off_heap); } erts_free_dist_ext_copy(mp->data.dist_ext); } } free_message(mp); mp = next_mp; } ASSERT(!p->monitors); ASSERT(!p->nlinks); ASSERT(!p->nodes_monitors); ASSERT(!p->suspend_monitors); p->fvalue = NIL; } static ERTS_INLINE erts_aint32_t set_proc_exiting_state(Process *p, erts_aint32_t state) { erts_aint32_t a, n, e; a = state; while (1) { n = e = a; n &= ~(ERTS_PSFLG_SUSPENDED|ERTS_PSFLG_PENDING_EXIT); n |= ERTS_PSFLG_EXITING|ERTS_PSFLG_ACTIVE; if (!(a & (ERTS_PSFLG_IN_RUNQ|ERTS_PSFLG_RUNNING))) n |= ERTS_PSFLG_IN_RUNQ; a = erts_smp_atomic32_cmpxchg_relb(&p->state, n, e); if (a == e) break; } return a; } static ERTS_INLINE void set_proc_exiting(Process *p, erts_aint32_t state, Eterm reason, ErlHeapFragment *bp) { ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(p) == ERTS_PROC_LOCKS_ALL); state = set_proc_exiting_state(p, state); p->fvalue = reason; if (bp) erts_link_mbuf_to_proc(p, bp); /* * We used to set freason to EXC_EXIT here, but there is no need to * save the stack trace since this process irreversibly is going to * exit. */ p->freason = EXTAG_EXIT; KILL_CATCHES(p); cancel_timer(p); p->i = (BeamInstr *) beam_exit; if (erts_system_profile_flags.runnable_procs && !(state & (ERTS_PSFLG_ACTIVE|ERTS_PSFLG_SUSPENDED))) { profile_runnable_proc(p, am_active); } if (!(state & (ERTS_PSFLG_IN_RUNQ|ERTS_PSFLG_RUNNING))) add2runq(p, state); } #ifdef ERTS_SMP void erts_handle_pending_exit(Process *c_p, ErtsProcLocks locks) { ErtsProcLocks xlocks; ASSERT(is_value(c_p->u.alive.pending_exit.reason)); ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == locks); ERTS_SMP_LC_ASSERT(locks & ERTS_PROC_LOCK_MAIN); ERTS_SMP_LC_ASSERT(!((ERTS_PSFLG_EXITING|ERTS_PSFLG_FREE) & erts_smp_atomic32_read_nob(&c_p->state))); /* Ensure that all locks on c_p are locked before proceeding... */ if (locks == ERTS_PROC_LOCKS_ALL) xlocks = 0; else { xlocks = ~locks & ERTS_PROC_LOCKS_ALL; if (erts_smp_proc_trylock(c_p, xlocks) == EBUSY) { erts_smp_proc_unlock(c_p, locks & ~ERTS_PROC_LOCK_MAIN); erts_smp_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); } } set_proc_exiting(c_p, erts_smp_atomic32_read_acqb(&c_p->state), c_p->u.alive.pending_exit.reason, c_p->u.alive.pending_exit.bp); c_p->u.alive.pending_exit.reason = THE_NON_VALUE; c_p->u.alive.pending_exit.bp = NULL; if (xlocks) erts_smp_proc_unlock(c_p, xlocks); } static void handle_pending_exiters(ErtsProcList *pnd_xtrs) { ErtsProcList *plp = pnd_xtrs; ErtsProcList *free_plp; while (plp) { Process *p = erts_pid2proc(NULL, 0, plp->pid, ERTS_PROC_LOCKS_ALL); if (p) { if (proclist_same(plp, p)) { erts_aint32_t state = erts_smp_atomic32_read_acqb(&p->state); if (!(state & ERTS_PSFLG_RUNNING)) { ASSERT(state & ERTS_PSFLG_PENDING_EXIT); erts_handle_pending_exit(p, ERTS_PROC_LOCKS_ALL); } } erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); } free_plp = plp; plp = plp->next; proclist_destroy(free_plp); } } static void save_pending_exiter(Process *p) { ErtsProcList *plp; ErtsRunQueue *rq; ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_STATUS & erts_proc_lc_my_proc_locks(p)); rq = erts_get_runq_current(NULL); plp = proclist_create(p); erts_smp_runq_lock(rq); plp->next = rq->procs.pending_exiters; rq->procs.pending_exiters = plp; erts_smp_runq_unlock(rq); wake_scheduler(rq, 1); } #endif /* * This function delivers an EXIT message to a process * which is trapping EXITs. */ static ERTS_INLINE void send_exit_message(Process *to, ErtsProcLocks *to_locksp, Eterm exit_term, Uint term_size, Eterm token) { if (token == NIL #ifdef USE_VM_PROBES || token == am_have_dt_utag #endif ) { Eterm* hp; Eterm mess; ErlHeapFragment* bp; ErlOffHeap *ohp; hp = erts_alloc_message_heap(term_size, &bp, &ohp, to, to_locksp); mess = copy_struct(exit_term, term_size, &hp, ohp); erts_queue_message(to, to_locksp, bp, mess, NIL #ifdef USE_VM_PROBES , NIL #endif ); } else { ErlHeapFragment* bp; Eterm* hp; Eterm mess; Eterm temp_token; Uint sz_token; ASSERT(is_tuple(token)); sz_token = size_object(token); bp = new_message_buffer(term_size+sz_token); hp = bp->mem; mess = copy_struct(exit_term, term_size, &hp, &bp->off_heap); /* the trace token must in this case be updated by the caller */ seq_trace_output(token, mess, SEQ_TRACE_SEND, to->id, NULL); temp_token = copy_struct(token, sz_token, &hp, &bp->off_heap); erts_queue_message(to, to_locksp, bp, mess, temp_token #ifdef USE_VM_PROBES , NIL #endif ); } } /* * * *** Exit signal behavior *** * * Exit signals are asynchronous (truly asynchronous in the * SMP emulator). When the signal is received the receiver receives an * 'EXIT' message if it is trapping exits; otherwise, it will either * ignore the signal if the exit reason is normal, or go into an * exiting state (ERTS_PSFLG_EXITING). When a process has gone into the * exiting state it will not execute any more Erlang code, but it might * take a while before it actually exits. The exit signal is being * received when the 'EXIT' message is put in the message queue, the * signal is dropped, or when it changes state into exiting. The time it * is in the exiting state before actually exiting is undefined (it * might take a really long time under certain conditions). The * receiver of the exit signal does not break links or trigger monitors * until it actually exits. * * Exit signals and other signals, e.g. messages, have to be received * by a receiver in the same order as sent by a sender. * * * * Exit signal implementation in the SMP emulator: * * If the receiver is trapping exits, the signal is transformed * into an 'EXIT' message and sent as a normal message, if the * reason is normal the signal is dropped; otherwise, the process * is determined to be exited. The interesting case is when the * process is to be exited and this is what is described below. * * If it is possible, the receiver is set in the exiting state straight * away and we are done; otherwise, the sender places the exit reason * in the pending_exit field of the process struct and if necessary * adds the receiver to the run queue. It is typically not possible * to set a scheduled process or a process which we cannot get all locks * on without releasing locks on it in an exiting state straight away. * * The receiver will poll the pending_exit field when it reach certain * places during it's execution. When it discovers the pending exit * it will change state into the exiting state. If the receiver wasn't * scheduled when the pending exit was set, the first scheduler that * schedules a new process will set the receiving process in the exiting * state just before it schedules next process. * * When the exit signal is placed in the pending_exit field, the signal * is considered as being in transit on the Erlang level. The signal is * actually in some kind of semi transit state, since we have already * determined how it should be received. It will exit the process no * matter what if it is received (the process may exit by itself before * reception of the exit signal). The signal is received when it is * discovered in the pending_exit field by the receiver. * * The receiver have to poll the pending_exit field at least before: * - moving messages from the message in queue to the private message * queue. This in order to preserve signal order. * - unlink. Otherwise the process might get exited on a link that * have been removed. * - changing the trap_exit flag to true. This in order to simplify the * implementation; otherwise, we would have to transform the signal * into an 'EXIT' message when setting the trap_exit flag to true. We * would also have to maintain a queue of exit signals in transit. * - being scheduled in or out. */ static ERTS_INLINE int send_exit_signal(Process *c_p, /* current process if and only if reason is stored on it */ Eterm from, /* Id of sender of signal */ Process *rp, /* receiving process */ ErtsProcLocks *rp_locks,/* current locks on receiver */ Eterm reason, /* exit reason */ Eterm exit_tuple, /* Prebuild exit tuple or THE_NON_VALUE */ Uint exit_tuple_sz, /* Size of prebuilt exit tuple (if exit_tuple != THE_NON_VALUE) */ Eterm token, /* token */ Process *token_update, /* token updater */ Uint32 flags /* flags */ ) { erts_aint32_t state = erts_smp_atomic32_read_nob(&rp->state); Eterm rsn = reason == am_kill ? am_killed : reason; ERTS_SMP_LC_ASSERT(*rp_locks == erts_proc_lc_my_proc_locks(rp)); ERTS_SMP_LC_ASSERT((*rp_locks & ERTS_PROC_LOCKS_XSIG_SEND) == ERTS_PROC_LOCKS_XSIG_SEND); ASSERT(reason != THE_NON_VALUE); #ifdef USE_VM_PROBES if(DTRACE_ENABLED(process_exit_signal) && is_pid(from)) { DTRACE_CHARBUF(sender_str, DTRACE_TERM_BUF_SIZE); DTRACE_CHARBUF(receiver_str, DTRACE_TERM_BUF_SIZE); DTRACE_CHARBUF(reason_buf, DTRACE_TERM_BUF_SIZE); dtrace_pid_str(from, sender_str); dtrace_proc_str(rp, receiver_str); erts_snprintf(reason_buf, sizeof(reason_buf) - 1, "%T", reason); DTRACE3(process_exit_signal, sender_str, receiver_str, reason_buf); } #endif if ((state & ERTS_PSFLG_TRAP_EXIT) && (reason != am_kill || (flags & ERTS_XSIG_FLG_IGN_KILL))) { if (is_not_nil(token) #ifdef USE_VM_PROBES && token != am_have_dt_utag #endif && token_update) seq_trace_update_send(token_update); if (is_value(exit_tuple)) send_exit_message(rp, rp_locks, exit_tuple, exit_tuple_sz, token); else erts_deliver_exit_message(from, rp, rp_locks, rsn, token); return 1; /* Receiver will get a message */ } else if (reason != am_normal || (flags & ERTS_XSIG_FLG_NO_IGN_NORMAL)) { #ifdef ERTS_SMP if (!(state & (ERTS_PSFLG_EXITING|ERTS_PSFLG_PENDING_EXIT))) { ASSERT(!rp->u.alive.pending_exit.bp); if (rp == c_p && (*rp_locks & ERTS_PROC_LOCK_MAIN)) { /* Ensure that all locks on c_p are locked before proceeding... */ if (*rp_locks != ERTS_PROC_LOCKS_ALL) { ErtsProcLocks need_locks = (~(*rp_locks) & ERTS_PROC_LOCKS_ALL); if (erts_smp_proc_trylock(c_p, need_locks) == EBUSY) { erts_smp_proc_unlock(c_p, *rp_locks & ~ERTS_PROC_LOCK_MAIN); erts_smp_proc_lock(c_p, ERTS_PROC_LOCKS_ALL_MINOR); } *rp_locks = ERTS_PROC_LOCKS_ALL; } set_proc_exiting(c_p, state, rsn, NULL); } else if (!(state & ERTS_PSFLG_RUNNING)) { /* Process not running ... */ ErtsProcLocks need_locks = ~(*rp_locks) & ERTS_PROC_LOCKS_ALL; if (need_locks && erts_smp_proc_trylock(rp, need_locks) == EBUSY) { /* ... but we havn't got all locks on it ... */ save_pending_exiter(rp); /* * The pending exit will be discovered when next * process is scheduled in */ goto set_pending_exit; } else { /* ...and we have all locks on it... */ *rp_locks = ERTS_PROC_LOCKS_ALL; set_proc_exiting(rp, state, (is_immed(rsn) ? rsn : copy_object(rsn, rp)), NULL); } } else { /* Process running... */ /* * The pending exit will be discovered when the process * is scheduled out if not discovered earlier. */ set_pending_exit: if (is_immed(rsn)) { rp->u.alive.pending_exit.reason = rsn; } else { Eterm *hp; Uint sz = size_object(rsn); ErlHeapFragment *bp = new_message_buffer(sz); hp = &bp->mem[0]; rp->u.alive.pending_exit.reason = copy_struct(rsn, sz, &hp, &bp->off_heap); rp->u.alive.pending_exit.bp = bp; } erts_smp_atomic32_read_bor_relb(&rp->state, ERTS_PSFLG_PENDING_EXIT); } } /* else: * * The receiver already has a pending exit (or is exiting) * so we drop this signal. * * NOTE: dropping this exit signal is based on the assumption * that the receiver *will* exit; either on the pending * exit or by itself before seeing the pending exit. */ #else /* !ERTS_SMP */ erts_aint32_t state = erts_smp_atomic32_read_nob(&rp->state); if (!(state & ERTS_PSFLG_EXITING)) { set_proc_exiting(rp, state, (is_immed(rsn) || c_p == rp ? rsn : copy_object(rsn, rp)), NULL); } #endif return -1; /* Receiver will exit */ } return 0; /* Receiver unaffected */ } int erts_send_exit_signal(Process *c_p, Eterm from, Process *rp, ErtsProcLocks *rp_locks, Eterm reason, Eterm token, Process *token_update, Uint32 flags) { return send_exit_signal(c_p, from, rp, rp_locks, reason, THE_NON_VALUE, 0, token, token_update, flags); } typedef struct { Eterm reason; Process *p; } ExitMonitorContext; static void doit_exit_monitor(ErtsMonitor *mon, void *vpcontext) { ExitMonitorContext *pcontext = vpcontext; DistEntry *dep; ErtsMonitor *rmon; Process *rp; if (mon->type == MON_ORIGIN) { /* We are monitoring someone else, we need to demonitor that one.. */ if (is_atom(mon->pid)) { /* remote by name */ ASSERT(is_node_name_atom(mon->pid)); dep = erts_sysname_to_connected_dist_entry(mon->pid); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_demonitor(&dsd, rmon->pid, mon->name, mon->ref, 1); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } erts_deref_dist_entry(dep); } } else { ASSERT(is_pid(mon->pid)); if (is_internal_pid(mon->pid)) { /* local by pid or name */ rp = erts_pid2proc(NULL, 0, mon->pid, ERTS_PROC_LOCK_LINK); if (!rp) { goto done; } rmon = erts_remove_monitor(&(rp->monitors),mon->ref); erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK); if (rmon == NULL) { goto done; } erts_destroy_monitor(rmon); } else { /* remote by pid */ ASSERT(is_external_pid(mon->pid)); dep = external_pid_dist_entry(mon->pid); ASSERT(dep != NULL); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_demonitor(&dsd, rmon->pid, mon->pid, mon->ref, 1); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } } } } } else { /* type == MON_TARGET */ ASSERT(mon->type == MON_TARGET); ASSERT(is_pid(mon->pid) || is_internal_port(mon->pid)); if (is_internal_port(mon->pid)) { Port *prt = erts_id2port(mon->pid, NULL, 0); if (prt == NULL) { goto done; } erts_fire_port_monitor(prt, mon->ref); erts_port_release(prt); } else if (is_internal_pid(mon->pid)) {/* local by name or pid */ Eterm watched; DeclareTmpHeapNoproc(lhp,3); ErtsProcLocks rp_locks = (ERTS_PROC_LOCK_LINK | ERTS_PROC_LOCKS_MSG_SEND); rp = erts_pid2proc(NULL, 0, mon->pid, rp_locks); if (rp == NULL) { goto done; } UseTmpHeapNoproc(3); rmon = erts_remove_monitor(&(rp->monitors),mon->ref); if (rmon) { erts_destroy_monitor(rmon); watched = (is_atom(mon->name) ? TUPLE2(lhp, mon->name, erts_this_dist_entry->sysname) : pcontext->p->id); erts_queue_monitor_message(rp, &rp_locks, mon->ref, am_process, watched, pcontext->reason); } UnUseTmpHeapNoproc(3); /* else: demonitor while we exited, i.e. do nothing... */ erts_smp_proc_unlock(rp, rp_locks); } else { /* external by pid or name */ ASSERT(is_external_pid(mon->pid)); dep = external_pid_dist_entry(mon->pid); ASSERT(dep != NULL); if (dep) { erts_smp_de_links_lock(dep); rmon = erts_remove_monitor(&(dep->monitors), mon->ref); erts_smp_de_links_unlock(dep); if (rmon) { ErtsDSigData dsd; int code = erts_dsig_prepare(&dsd, dep, NULL, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_m_exit(&dsd, mon->pid, (rmon->name != NIL ? rmon->name : rmon->pid), mon->ref, pcontext->reason); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_destroy_monitor(rmon); } } } } done: /* As the monitors are previously removed from the process, distribution operations will not cause monitors to disappear, we can safely delete it. */ erts_destroy_monitor(mon); } typedef struct { Process *p; Eterm reason; Eterm exit_tuple; Uint exit_tuple_sz; } ExitLinkContext; static void doit_exit_link(ErtsLink *lnk, void *vpcontext) { ExitLinkContext *pcontext = vpcontext; /* Unpack context, it's readonly */ Process *p = pcontext->p; Eterm reason = pcontext->reason; Eterm exit_tuple = pcontext->exit_tuple; Uint exit_tuple_sz = pcontext->exit_tuple_sz; Eterm item = lnk->pid; ErtsLink *rlnk; DistEntry *dep; Process *rp; switch(lnk->type) { case LINK_PID: if(is_internal_port(item)) { Port *prt = erts_id2port(item, NULL, 0); if (prt) { rlnk = erts_remove_link(&prt->nlinks, p->id); if (rlnk) erts_destroy_link(rlnk); erts_do_exit_port(prt, p->id, reason); erts_port_release(prt); } } else if(is_external_port(item)) { erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); erts_dsprintf(dsbufp, "Erroneous link between %T and external port %T " "found\n", p->id, item); erts_send_error_to_logger_nogl(dsbufp); ASSERT(0); /* It isn't possible to setup such a link... */ } else if (is_internal_pid(item)) { ErtsProcLocks rp_locks = (ERTS_PROC_LOCK_LINK | ERTS_PROC_LOCKS_XSIG_SEND); rp = erts_pid2proc(NULL, 0, item, rp_locks); if (rp) { rlnk = erts_remove_link(&(rp->nlinks), p->id); /* If rlnk == NULL, we got unlinked while exiting, i.e., do nothing... */ if (rlnk) { int xres; erts_destroy_link(rlnk); xres = send_exit_signal(NULL, p->id, rp, &rp_locks, reason, exit_tuple, exit_tuple_sz, SEQ_TRACE_TOKEN(p), p, ERTS_XSIG_FLG_IGN_KILL); if (xres >= 0 && IS_TRACED_FL(rp, F_TRACE_PROCS)) { /* We didn't exit the process and it is traced */ if (IS_TRACED_FL(rp, F_TRACE_PROCS)) { trace_proc(p, rp, am_getting_unlinked, p->id); } } } ASSERT(rp != p); erts_smp_proc_unlock(rp, rp_locks); } } else if (is_external_pid(item)) { dep = external_pid_dist_entry(item); if(dep != erts_this_dist_entry) { ErtsDSigData dsd; int code; ErtsDistLinkData dld; erts_remove_dist_link(&dld, p->id, item, dep); erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN); code = erts_dsig_prepare(&dsd, dep, p, ERTS_DSP_NO_LOCK, 0); if (code == ERTS_DSIG_PREP_CONNECTED) { code = erts_dsig_send_exit_tt(&dsd, p->id, item, reason, SEQ_TRACE_TOKEN(p)); ASSERT(code == ERTS_DSIG_SEND_OK); } erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN); erts_destroy_dist_link(&dld); } } break; case LINK_NODE: ASSERT(is_node_name_atom(item)); dep = erts_sysname_to_connected_dist_entry(item); if(dep) { /* dist entries have node links in a separate structure to avoid confusion */ erts_smp_de_links_lock(dep); rlnk = erts_remove_link(&(dep->node_links), p->id); erts_smp_de_links_unlock(dep); if (rlnk) erts_destroy_link(rlnk); erts_deref_dist_entry(dep); } break; default: erl_exit(1, "bad type in link list\n"); break; } erts_destroy_link(lnk); } static void resume_suspend_monitor(ErtsSuspendMonitor *smon, void *vc_p) { Process *suspendee = erts_pid2proc((Process *) vc_p, ERTS_PROC_LOCK_MAIN, smon->pid, ERTS_PROC_LOCK_STATUS); if (suspendee) { if (smon->active) resume_process(suspendee); erts_smp_proc_unlock(suspendee, ERTS_PROC_LOCK_STATUS); } erts_destroy_suspend_monitor(smon); } #ifdef ERTS_SMP static void proc_dec_refc(void *vproc) { erts_smp_proc_dec_refc((Process *) vproc); } #endif /* this function fishishes a process and propagates exit messages - called by process_main when a process dies */ void erts_do_exit_process(Process* p, Eterm reason) { #ifdef ERTS_SMP erts_aint32_t state; #endif p->arity = 0; /* No live registers */ p->fvalue = reason; #ifdef USE_VM_PROBES if (DTRACE_ENABLED(process_exit)) { DTRACE_CHARBUF(process_buf, DTRACE_TERM_BUF_SIZE); DTRACE_CHARBUF(reason_buf, DTRACE_TERM_BUF_SIZE); dtrace_proc_str(p, process_buf); erts_snprintf(reason_buf, DTRACE_TERM_BUF_SIZE - 1, "%T", reason); DTRACE2(process_exit, process_buf, reason_buf); } #endif #ifdef ERTS_SMP ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); /* By locking all locks (main lock is already locked) when going to exiting state (ERTS_PSFLG_EXITING), it is enough to take any lock when looking up a process (erts_pid2proc()) to prevent the looked up process from exiting until the lock has been released. */ erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); #endif #ifndef ERTS_SMP set_proc_exiting_state(p, erts_smp_atomic32_read_nob(&p->state)); #else state = set_proc_exiting_state(p, erts_smp_atomic32_read_nob(&p->state)); if (state & ERTS_PSFLG_PENDING_EXIT) { /* Process exited before pending exit was received... */ p->u.alive.pending_exit.reason = THE_NON_VALUE; if (p->u.alive.pending_exit.bp) { free_message_buffer(p->u.alive.pending_exit.bp); p->u.alive.pending_exit.bp = NULL; } } cancel_suspend_of_suspendee(p, ERTS_PROC_LOCKS_ALL); ERTS_SMP_MSGQ_MV_INQ2PRIVQ(p); #endif if (IS_TRACED(p)) { if (IS_TRACED_FL(p, F_TRACE_CALLS)) erts_schedule_time_break(p, ERTS_BP_CALL_TIME_SCHEDULE_EXITING); if (IS_TRACED_FL(p,F_TRACE_PROCS)) trace_proc(p, p, am_exit, reason); } erts_trace_check_exiting(p->id); ASSERT((p->trace_flags & F_INITIAL_TRACE_FLAGS) == F_INITIAL_TRACE_FLAGS); cancel_timer(p); /* Always cancel timer just in case */ /* * The timer of this process can *not* be used anymore. The field used * for the timer is now used for misc exiting data. */ p->u.exit_data = NULL; if (p->bif_timers) erts_cancel_bif_timers(p, ERTS_PROC_LOCKS_ALL); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL_MINOR); erts_continue_exit_process(p); } void erts_continue_exit_process(Process *p) { ErtsLink* lnk; ErtsMonitor *mon; ErtsProcLocks curr_locks = ERTS_PROC_LOCK_MAIN; Eterm reason = p->fvalue; DistEntry *dep; struct saved_calls *scb; process_breakpoint_time_t *pbt; #ifdef DEBUG int yield_allowed = 1; #endif ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(p)); ASSERT(ERTS_PROC_IS_EXITING(p)); #ifdef ERTS_SMP if (p->flags & F_HAVE_BLCKD_MSCHED) { ErtsSchedSuspendResult ssr; ssr = erts_block_multi_scheduling(p, ERTS_PROC_LOCK_MAIN, 0, 1); switch (ssr) { case ERTS_SCHDLR_SSPND_YIELD_RESTART: goto yield; case ERTS_SCHDLR_SSPND_DONE_MSCHED_BLOCKED: case ERTS_SCHDLR_SSPND_YIELD_DONE_MSCHED_BLOCKED: case ERTS_SCHDLR_SSPND_DONE: case ERTS_SCHDLR_SSPND_YIELD_DONE: p->flags &= ~F_HAVE_BLCKD_MSCHED; break; case ERTS_SCHDLR_SSPND_EINVAL: default: erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error: %d\n", __FILE__, __LINE__, (int) ssr); } } #endif if (p->flags & F_USING_DB) { if (erts_db_process_exiting(p, ERTS_PROC_LOCK_MAIN)) goto yield; p->flags &= ~F_USING_DB; } if (p->flags & F_USING_DDLL) { erts_ddll_proc_dead(p, ERTS_PROC_LOCK_MAIN); p->flags &= ~F_USING_DDLL; } if (p->nodes_monitors) { erts_delete_nodes_monitors(p, ERTS_PROC_LOCK_MAIN); p->nodes_monitors = NULL; } if (p->suspend_monitors) { erts_sweep_suspend_monitors(p->suspend_monitors, resume_suspend_monitor, p); p->suspend_monitors = NULL; } /* * The registered name *should* be the last "erlang resource" to * cleanup. */ if (p->reg) { (void) erts_unregister_name(p, ERTS_PROC_LOCK_MAIN, NULL, THE_NON_VALUE); ASSERT(!p->reg); } erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR); curr_locks = ERTS_PROC_LOCKS_ALL; /* * From this point on we are no longer allowed to yield * this process. */ #ifdef DEBUG yield_allowed = 0; #endif { int maybe_save; int pix; /* Do *not* use erts_get_runq_proc() */ ErtsRunQueue *rq; rq = erts_get_runq_current(ERTS_GET_SCHEDULER_DATA_FROM_PROC(p)); pix = internal_pid_index(p->id); erts_smp_rwmtx_rlock(&erts_proc_tab_rwmtx); maybe_save = saved_term_procs.end != NULL; if (maybe_save) { erts_smp_rwmtx_runlock(&erts_proc_tab_rwmtx); erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); } erts_smp_runq_lock(rq); #ifdef ERTS_SMP ASSERT(p->scheduler_data); ASSERT(p->scheduler_data->current_process == p); ASSERT(p->scheduler_data->free_process == NULL); p->scheduler_data->current_process = NULL; p->scheduler_data->free_process = p; #endif /* Time of death! */ erts_smp_atomic_set_relb(&erts_proc.tab[pix], ERTS_AINT_NULL); ASSERT(erts_smp_atomic32_read_nob(&process_count) > 0); erts_smp_atomic32_dec_relb(&process_count); erts_smp_runq_unlock(rq); if (!maybe_save) erts_smp_rwmtx_runlock(&erts_proc_tab_rwmtx); else { if (saved_term_procs.end) save_terminating_process(p); erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); } } /* * All "erlang resources" have to be deallocated before this point, * e.g. registered name, so monitoring and linked processes can * be sure that all interesting resources have been deallocated * when the monitors and/or links hit. */ mon = p->monitors; p->monitors = NULL; /* to avoid recursive deletion during traversal */ lnk = p->nlinks; p->nlinks = NULL; { /* Inactivate and notify free */ erts_aint32_t n, e, a = erts_smp_atomic32_read_nob(&p->state); while (1) { n = e = a; ASSERT(a & ERTS_PSFLG_EXITING); n |= ERTS_PSFLG_FREE; n &= ~ERTS_PSFLG_ACTIVE; a = erts_smp_atomic32_cmpxchg_mb(&p->state, n, e); if (a == e) break; } } dep = ((p->flags & F_DISTRIBUTION) ? ERTS_PROC_SET_DIST_ENTRY(p, ERTS_PROC_LOCKS_ALL, NULL) : NULL); scb = ERTS_PROC_SET_SAVED_CALLS_BUF(p, ERTS_PROC_LOCKS_ALL, NULL); pbt = ERTS_PROC_SET_CALL_TIME(p, ERTS_PROC_LOCKS_ALL, NULL); erts_smp_proc_unlock(p, ERTS_PROC_LOCKS_ALL); #ifdef BM_COUNTERS processes_busy--; #endif if (dep) { erts_do_net_exits(dep, reason); if(dep) erts_deref_dist_entry(dep); } /* * Pre-build the EXIT tuple if there are any links. */ if (lnk) { DeclareTmpHeap(tmp_heap,4,p); Eterm exit_tuple; Uint exit_tuple_sz; Eterm* hp; UseTmpHeap(4,p); hp = &tmp_heap[0]; exit_tuple = TUPLE3(hp, am_EXIT, p->id, reason); exit_tuple_sz = size_object(exit_tuple); { ExitLinkContext context = {p, reason, exit_tuple, exit_tuple_sz}; erts_sweep_links(lnk, &doit_exit_link, &context); } UnUseTmpHeap(4,p); } { ExitMonitorContext context = {reason, p}; erts_sweep_monitors(mon,&doit_exit_monitor,&context); /* Allocates TmpHeap, but we have none here */ } if (scb) erts_free(ERTS_ALC_T_CALLS_BUF, (void *) scb); if (pbt) erts_free(ERTS_ALC_T_BPD, (void *) pbt); delete_process(p); #ifdef ERTS_SMP erts_schedule_thr_prgr_later_op(proc_dec_refc, (void *) p, &p->u.release_data); erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN); ERTS_SMP_CHK_HAVE_ONLY_MAIN_PROC_LOCK(p); #endif return; yield: #ifdef DEBUG ASSERT(yield_allowed); #endif ERTS_SMP_LC_ASSERT(curr_locks == erts_proc_lc_my_proc_locks(p)); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & curr_locks); p->i = (BeamInstr *) beam_continue_exit; if (!(curr_locks & ERTS_PROC_LOCK_STATUS)) { erts_smp_proc_lock(p, ERTS_PROC_LOCK_STATUS); curr_locks |= ERTS_PROC_LOCK_STATUS; } if (curr_locks != ERTS_PROC_LOCK_MAIN) erts_smp_proc_unlock(p, ~ERTS_PROC_LOCK_MAIN & curr_locks); ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN == erts_proc_lc_my_proc_locks(p)); } /* Callback for process timeout */ static void timeout_proc(Process* p) { erts_aint32_t state; BeamInstr** pi = (BeamInstr **) p->def_arg_reg; p->i = *pi; p->flags |= F_TIMO; p->flags &= ~F_INSLPQUEUE; state = erts_smp_atomic32_read_acqb(&p->state); if (!(state & ERTS_PSFLG_ACTIVE)) schedule_process(p, state, 0); } void cancel_timer(Process* p) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(p)); p->flags &= ~(F_INSLPQUEUE|F_TIMO); #ifdef ERTS_SMP erts_cancel_smp_ptimer(p->u.alive.ptimer); #else erts_cancel_timer(&p->u.alive.tm); #endif } /* * Insert a process into the time queue, with a timeout 'timeout' in ms. */ void set_timer(Process* p, Uint timeout) { ERTS_SMP_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(p)); /* check for special case timeout=0 DONT ADD TO time queue */ if (timeout == 0) { p->flags |= F_TIMO; return; } p->flags |= F_INSLPQUEUE; p->flags &= ~F_TIMO; #ifdef ERTS_SMP erts_create_smp_ptimer(&p->u.alive.ptimer, p->id, (ErlTimeoutProc) timeout_proc, timeout); #else erts_set_timer(&p->u.alive.tm, (ErlTimeoutProc) timeout_proc, NULL, (void*) p, timeout); #endif } /* * Stack dump functions follow. */ void erts_stack_dump(int to, void *to_arg, Process *p) { Eterm* sp; int yreg = -1; if (p->trace_flags & F_SENSITIVE) { return; } erts_program_counter_info(to, to_arg, p); for (sp = p->stop; sp < STACK_START(p); sp++) { yreg = stack_element_dump(to, to_arg, p, sp, yreg); } } void erts_program_counter_info(int to, void *to_arg, Process *p) { erts_aint32_t state; int i; erts_print(to, to_arg, "Program counter: %p (", p->i); print_function_from_pc(to, to_arg, p->i); erts_print(to, to_arg, ")\n"); erts_print(to, to_arg, "CP: %p (", p->cp); print_function_from_pc(to, to_arg, p->cp); erts_print(to, to_arg, ")\n"); state = erts_smp_atomic32_read_acqb(&p->state); if (!(state & (ERTS_PSFLG_RUNNING|ERTS_PSFLG_GC))) { erts_print(to, to_arg, "arity = %d\n",p->arity); if (!ERTS_IS_CRASH_DUMPING) { /* * Only print the arguments if we are not writing a * crash dump file. The arguments cannot be interpreted * by the crashdump_viewer application and will therefore * only cause problems. */ for (i = 0; i < p->arity; i++) erts_print(to, to_arg, " %.*T\n", INT_MAX, p->arg_reg[i]); } } } static void print_function_from_pc(int to, void *to_arg, BeamInstr* x) { BeamInstr* addr = find_function_from_pc(x); if (addr == NULL) { if (x == beam_exit) { erts_print(to, to_arg, ""); } else if (x == beam_continue_exit) { erts_print(to, to_arg, ""); } else if (x == beam_apply+1) { erts_print(to, to_arg, ""); } else if (x == 0) { erts_print(to, to_arg, "invalid"); } else { erts_print(to, to_arg, "unknown function"); } } else { erts_print(to, to_arg, "%T:%T/%d + %d", addr[0], addr[1], addr[2], ((x-addr)-2) * sizeof(Eterm)); } } static int stack_element_dump(int to, void *to_arg, Process* p, Eterm* sp, int yreg) { Eterm x = *sp; if (yreg < 0 || is_CP(x)) { erts_print(to, to_arg, "\n%p ", sp); } else { char sbuf[16]; sprintf(sbuf, "y(%d)", yreg); erts_print(to, to_arg, "%-8s ", sbuf); yreg++; } if (is_CP(x)) { erts_print(to, to_arg, "Return addr %p (", (Eterm *) EXPAND_POINTER(x)); print_function_from_pc(to, to_arg, cp_val(x)); erts_print(to, to_arg, ")\n"); yreg = 0; } else if is_catch(x) { erts_print(to, to_arg, "Catch %p (", catch_pc(x)); print_function_from_pc(to, to_arg, catch_pc(x)); erts_print(to, to_arg, ")\n"); } else { erts_print(to, to_arg, "%T\n", x); } return yreg; } /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ * The processes/0 BIF implementation. * \* */ #define ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED 25 #define ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE 1000 #define ERTS_PROCESSES_BIF_MIN_START_REDS \ (ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE \ / ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED) #define ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS 1 #define ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED 10 #define ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS \ (ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE \ / ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED) #define ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED 75 #define ERTS_PROCS_DBG_DO_TRACE 0 #ifdef DEBUG # define ERTS_PROCESSES_BIF_DEBUGLEVEL 100 #else # define ERTS_PROCESSES_BIF_DEBUGLEVEL 0 #endif #define ERTS_PROCS_DBGLVL_CHK_HALLOC 1 #define ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS 5 #define ERTS_PROCS_DBGLVL_CHK_PIDS 10 #define ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST 20 #define ERTS_PROCS_DBGLVL_CHK_RESLIST 20 #if ERTS_PROCESSES_BIF_DEBUGLEVEL == 0 # define ERTS_PROCS_ASSERT(EXP) #else # define ERTS_PROCS_ASSERT(EXP) \ ((void) ((EXP) \ ? 1 \ : (debug_processes_assert_error(#EXP, __FILE__, __LINE__), 0))) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_HALLOC # define ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(PBDP, HP, SZ) \ do { \ ERTS_PROCS_ASSERT(!(PBDP)->debug.heap); \ ERTS_PROCS_ASSERT(!(PBDP)->debug.heap_size); \ (PBDP)->debug.heap = (HP); \ (PBDP)->debug.heap_size = (SZ); \ } while (0) # define ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(PBDP, HP) \ do { \ ERTS_PROCS_ASSERT((PBDP)->debug.heap); \ ERTS_PROCS_ASSERT((PBDP)->debug.heap_size); \ ERTS_PROCS_ASSERT((PBDP)->debug.heap + (PBDP)->debug.heap_size == (HP));\ (PBDP)->debug.heap = NULL; \ (PBDP)->debug.heap_size = 0; \ } while (0) # define ERTS_PROCS_DBG_HEAP_ALLOC_INIT(PBDP) \ do { \ (PBDP)->debug.heap = NULL; \ (PBDP)->debug.heap_size = 0; \ } while (0) #else # define ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(PBDP, HP, SZ) # define ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(PBDP, HP) # define ERTS_PROCS_DBG_HEAP_ALLOC_INIT(PBDP) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST # define ERTS_PROCS_DBG_CHK_RESLIST(R) debug_processes_check_res_list((R)) #else # define ERTS_PROCS_DBG_CHK_RESLIST(R) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS # define ERTS_PROCS_DBG_SAVE_PIDS(PBDP) debug_processes_save_all_pids((PBDP)) # define ERTS_PROCS_DBG_VERIFY_PIDS(PBDP) \ do { \ if (!(PBDP)->debug.correct_pids_verified) \ debug_processes_verify_all_pids((PBDP)); \ } while (0) # define ERTS_PROCS_DBG_CLEANUP_CHK_PIDS(PBDP) \ do { \ if ((PBDP)->debug.correct_pids) { \ erts_free(ERTS_ALC_T_PROCS_PIDS, \ (PBDP)->debug.correct_pids); \ (PBDP)->debug.correct_pids = NULL; \ } \ } while(0) # define ERTS_PROCS_DBG_CHK_PIDS_INIT(PBDP) \ do { \ (PBDP)->debug.correct_pids_verified = 0; \ (PBDP)->debug.correct_pids = NULL; \ } while (0) #else # define ERTS_PROCS_DBG_SAVE_PIDS(PBDP) # define ERTS_PROCS_DBG_VERIFY_PIDS(PBDP) # define ERTS_PROCS_DBG_CLEANUP_CHK_PIDS(PBDP) # define ERTS_PROCS_DBG_CHK_PIDS_INIT(PBDP) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS # define ERTS_PROCS_DBG_CHK_PID_FOUND(PBDP, PID, IC) \ debug_processes_check_found_pid((PBDP), (PID), (IC), 1) # define ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(PBDP, PID, IC) \ debug_processes_check_found_pid((PBDP), (PID), (IC), 0) #else # define ERTS_PROCS_DBG_CHK_PID_FOUND(PBDP, PID, IC) # define ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(PBDP, PID, IC) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST # define ERTS_PROCS_DBG_CHK_TPLIST() \ debug_processes_check_term_proc_list() # define ERTS_PROCS_DBG_CHK_FREELIST(FL) \ debug_processes_check_term_proc_free_list(FL) #else # define ERTS_PROCS_DBG_CHK_TPLIST() # define ERTS_PROCS_DBG_CHK_FREELIST(FL) #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL == 0 #if ERTS_PROCS_DBG_DO_TRACE # define ERTS_PROCS_DBG_INIT(P, PBDP) (PBDP)->debug.caller = (P)->id # else # define ERTS_PROCS_DBG_INIT(P, PBDP) # endif # define ERTS_PROCS_DBG_CLEANUP(PBDP) #else # define ERTS_PROCS_DBG_INIT(P, PBDP) \ do { \ (PBDP)->debug.caller = (P)->id; \ ERTS_PROCS_DBG_HEAP_ALLOC_INIT((PBDP)); \ ERTS_PROCS_DBG_CHK_PIDS_INIT((PBDP)); \ } while (0) # define ERTS_PROCS_DBG_CLEANUP(PBDP) \ do { \ ERTS_PROCS_DBG_CLEANUP_CHK_PIDS((PBDP)); \ } while (0) #endif #if ERTS_PROCS_DBG_DO_TRACE # define ERTS_PROCS_DBG_TRACE(PID, FUNC, WHAT) \ erts_fprintf(stderr, "%T %s:%d:%s(): %s\n", \ (PID), __FILE__, __LINE__, #FUNC, #WHAT) #else # define ERTS_PROCS_DBG_TRACE(PID, FUNC, WHAT) #endif static Uint processes_bif_tab_chunks; static Export processes_trap_export; typedef struct { Uint64 interval; } ErtsProcessesBifChunkInfo; typedef enum { INITIALIZING, INSPECTING_TABLE, INSPECTING_TERMINATED_PROCESSES, BUILDING_RESULT, RETURN_RESULT } ErtsProcessesBifState; typedef struct { ErtsProcessesBifState state; Eterm caller; ErtsProcessesBifChunkInfo *chunk; int tix; int pid_ix; int pid_sz; Eterm *pid; ErtsTermProcElement *bif_invocation; /* Only used when > 1 chunk */ #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 || ERTS_PROCS_DBG_DO_TRACE struct { Eterm caller; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS Uint64 *pid_started; #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_HALLOC Eterm *heap; Uint heap_size; #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS int correct_pids_verified; Eterm *correct_pids; #endif } debug; #endif } ErtsProcessesBifData; #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 static void debug_processes_assert_error(char* expr, char* file, int line); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST static void debug_processes_check_res_list(Eterm list); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS static void debug_processes_save_all_pids(ErtsProcessesBifData *pbdp); static void debug_processes_verify_all_pids(ErtsProcessesBifData *pbdp); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS static void debug_processes_check_found_pid(ErtsProcessesBifData *pbdp, Eterm pid, Uint64 ic, int pid_should_be_found); #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST static void debug_processes_check_term_proc_list(void); static void debug_processes_check_term_proc_free_list(ErtsTermProcElement *tpep); #endif static void save_terminating_process(Process *p) { ErtsTermProcElement *tpep = erts_alloc(ERTS_ALC_T_PROCS_TPROC_EL, sizeof(ErtsTermProcElement)); ERTS_PROCS_ASSERT(saved_term_procs.start && saved_term_procs.end); ERTS_SMP_LC_ASSERT(erts_lc_rwmtx_is_rwlocked(&erts_proc_tab_rwmtx)); ERTS_PROCS_DBG_CHK_TPLIST(); tpep->prev = saved_term_procs.end; tpep->next = NULL; tpep->ix = internal_pid_index(p->id); tpep->u.process.pid = p->id; tpep->u.process.spawned = p->started_interval; tpep->u.process.exited = get_proc_interval(); saved_term_procs.end->next = tpep; saved_term_procs.end = tpep; ERTS_PROCS_DBG_CHK_TPLIST(); ERTS_PROCS_ASSERT(tpep->prev->ix >= 0 ? (tpep->u.process.exited >= tpep->prev->u.process.exited) : (tpep->u.process.exited >= tpep->prev->u.bif_invocation.interval)); } static void cleanup_processes_bif_data(Binary *bp) { ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(bp); ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, call); if (pbdp->state != INITIALIZING) { if (pbdp->chunk) { erts_free(ERTS_ALC_T_PROCS_CNKINF, pbdp->chunk); pbdp->chunk = NULL; } if (pbdp->pid) { erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->pid); pbdp->pid = NULL; } #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS if (pbdp->debug.pid_started) { erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.pid_started); pbdp->debug.pid_started = NULL; } #endif if (pbdp->bif_invocation) { ErtsTermProcElement *tpep; erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, term_proc_cleanup); tpep = pbdp->bif_invocation; pbdp->bif_invocation = NULL; ERTS_PROCS_DBG_CHK_TPLIST(); if (tpep->prev) { /* * Only remove this bif invokation when we * have preceding invokations. */ tpep->prev->next = tpep->next; if (tpep->next) tpep->next->prev = tpep->prev; else { /* * At the time of writing this branch cannot be * reached. I don't want to remove this code though * since it may be possible to reach this line * in the future if the cleanup order in * erts_do_exit_process() is changed. The ASSERT(0) * is only here to make us aware that the reorder * has happened. /rickard */ ASSERT(0); saved_term_procs.end = tpep->prev; } erts_free(ERTS_ALC_T_PROCS_TPROC_EL, tpep); } else { /* * Free all elements until next bif invokation * is found. */ ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); do { ErtsTermProcElement *ftpep = tpep; tpep = tpep->next; erts_free(ERTS_ALC_T_PROCS_TPROC_EL, ftpep); } while (tpep && tpep->ix >= 0); saved_term_procs.start = tpep; if (tpep) tpep->prev = NULL; else saved_term_procs.end = NULL; } ERTS_PROCS_DBG_CHK_TPLIST(); erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); } } ERTS_PROCS_DBG_TRACE(pbdp->debug.caller, cleanup_processes_bif_data, return); ERTS_PROCS_DBG_CLEANUP(pbdp); } static int processes_bif_engine(Process *p, Eterm *res_accp, Binary *mbp) { ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(mbp); int have_reds; int reds; int locked = 0; do { switch (pbdp->state) { case INITIALIZING: pbdp->chunk = erts_alloc(ERTS_ALC_T_PROCS_CNKINF, (sizeof(ErtsProcessesBifChunkInfo) * processes_bif_tab_chunks)); pbdp->tix = 0; pbdp->pid_ix = 0; erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); locked = 1; ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, init); pbdp->pid_sz = erts_process_count(); pbdp->pid = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(Eterm)*pbdp->pid_sz); #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(Uint64)*pbdp->pid_sz); #endif ERTS_PROCS_DBG_SAVE_PIDS(pbdp); if (processes_bif_tab_chunks == 1) pbdp->bif_invocation = NULL; else { /* * We will have to access the table multiple times * releasing the table lock in between chunks. */ pbdp->bif_invocation = erts_alloc(ERTS_ALC_T_PROCS_TPROC_EL, sizeof(ErtsTermProcElement)); pbdp->bif_invocation->ix = -1; pbdp->bif_invocation->u.bif_invocation.interval = step_proc_interval(); ERTS_PROCS_DBG_CHK_TPLIST(); pbdp->bif_invocation->next = NULL; if (saved_term_procs.end) { pbdp->bif_invocation->prev = saved_term_procs.end; saved_term_procs.end->next = pbdp->bif_invocation; ERTS_PROCS_ASSERT(saved_term_procs.start); } else { pbdp->bif_invocation->prev = NULL; saved_term_procs.start = pbdp->bif_invocation; } saved_term_procs.end = pbdp->bif_invocation; ERTS_PROCS_DBG_CHK_TPLIST(); } pbdp->state = INSPECTING_TABLE; /* Fall through */ case INSPECTING_TABLE: { int ix = pbdp->tix; int indices = ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; int cix = ix / ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; int end_ix = ix + indices; Uint64 *invocation_interval_p; invocation_interval_p = (pbdp->bif_invocation ? &pbdp->bif_invocation->u.bif_invocation.interval : NULL); ERTS_PROCS_ASSERT(is_nil(*res_accp)); if (!locked) { erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); locked = 1; } ERTS_SMP_LC_ASSERT(erts_lc_rwmtx_is_rwlocked(&erts_proc_tab_rwmtx)); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, insp_table); if (cix != 0) pbdp->chunk[cix].interval = step_proc_interval(); else if (pbdp->bif_invocation) pbdp->chunk[0].interval = *invocation_interval_p; /* else: interval is irrelevant */ if (end_ix >= erts_proc.max) { ERTS_PROCS_ASSERT(cix+1 == processes_bif_tab_chunks); end_ix = erts_proc.max; indices = end_ix - ix; /* What to do when done with this chunk */ pbdp->state = (processes_bif_tab_chunks == 1 ? BUILDING_RESULT : INSPECTING_TERMINATED_PROCESSES); } for (; ix < end_ix; ix++) { Process *rp = erts_pix2proc(ix); if (rp && (!invocation_interval_p || rp->started_interval < *invocation_interval_p)) { ERTS_PROCS_ASSERT(is_internal_pid(rp->id)); pbdp->pid[pbdp->pid_ix] = rp->id; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started[pbdp->pid_ix] = rp->started_interval; #endif pbdp->pid_ix++; ERTS_PROCS_ASSERT(pbdp->pid_ix <= pbdp->pid_sz); } } pbdp->tix = end_ix; erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); locked = 0; reds = indices/ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED; BUMP_REDS(p, reds); have_reds = ERTS_BIF_REDS_LEFT(p); if (have_reds && pbdp->state == INSPECTING_TABLE) { ix = pbdp->tix; indices = ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; end_ix = ix + indices; if (end_ix > erts_proc.max) { end_ix = erts_proc.max; indices = end_ix - ix; } reds = indices/ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED; /* Pretend we have no reds left if we haven't got enough reductions to complete next chunk */ if (reds > have_reds) have_reds = 0; } break; } case INSPECTING_TERMINATED_PROCESSES: { int i; int max_reds; int free_term_procs = 0; Uint64 invocation_interval; ErtsTermProcElement *tpep; ErtsTermProcElement *free_list = NULL; tpep = pbdp->bif_invocation; ERTS_PROCS_ASSERT(tpep); invocation_interval = tpep->u.bif_invocation.interval; max_reds = have_reds = ERTS_BIF_REDS_LEFT(p); if (max_reds > ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS) max_reds = ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS; reds = 0; erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, insp_term_procs); ERTS_PROCS_DBG_CHK_TPLIST(); if (tpep->prev) tpep->prev->next = tpep->next; else { ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); saved_term_procs.start = tpep->next; if (saved_term_procs.start && saved_term_procs.start->ix >= 0) { free_list = saved_term_procs.start; free_term_procs = 1; } } if (tpep->next) tpep->next->prev = tpep->prev; else saved_term_procs.end = tpep->prev; tpep = tpep->next; i = 0; while (reds < max_reds && tpep) { if (tpep->ix < 0) { if (free_term_procs) { ERTS_PROCS_ASSERT(free_list); ERTS_PROCS_ASSERT(tpep->prev); tpep->prev->next = NULL; /* end of free_list */ saved_term_procs.start = tpep; tpep->prev = NULL; free_term_procs = 0; } } else { int cix = tpep->ix/ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE; Uint64 chunk_interval = pbdp->chunk[cix].interval; Eterm pid = tpep->u.process.pid; ERTS_PROCS_ASSERT(is_internal_pid(pid)); if (tpep->u.process.spawned < invocation_interval) { if (tpep->u.process.exited < chunk_interval) { ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(pbdp, pid, tpep->u.process.spawned); pbdp->pid[pbdp->pid_ix] = pid; #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started[pbdp->pid_ix] = tpep->u.process.spawned; #endif pbdp->pid_ix++; ERTS_PROCS_ASSERT(pbdp->pid_ix <= pbdp->pid_sz); } else { ERTS_PROCS_DBG_CHK_PID_FOUND(pbdp, pid, tpep->u.process.spawned); } } else { ERTS_PROCS_DBG_CHK_PID_NOT_FOUND(pbdp, pid, tpep->u.process.spawned); } i++; if (i == ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED) { reds++; i = 0; } if (free_term_procs) reds += ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS; } tpep = tpep->next; } if (free_term_procs) { ERTS_PROCS_ASSERT(free_list); saved_term_procs.start = tpep; if (!tpep) saved_term_procs.end = NULL; else { ERTS_PROCS_ASSERT(tpep->prev); tpep->prev->next = NULL; /* end of free_list */ tpep->prev = NULL; } } if (!tpep) { /* Done */ ERTS_PROCS_ASSERT(pbdp->pid_ix == pbdp->pid_sz); pbdp->state = BUILDING_RESULT; pbdp->bif_invocation->next = free_list; free_list = pbdp->bif_invocation; pbdp->bif_invocation = NULL; } else { /* Link in bif_invocation again where we left off */ pbdp->bif_invocation->prev = tpep->prev; pbdp->bif_invocation->next = tpep; tpep->prev = pbdp->bif_invocation; if (pbdp->bif_invocation->prev) pbdp->bif_invocation->prev->next = pbdp->bif_invocation; else { ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); saved_term_procs.start = pbdp->bif_invocation; } } ERTS_PROCS_DBG_CHK_TPLIST(); ERTS_PROCS_DBG_CHK_FREELIST(free_list); erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); /* * We do the actual free of term proc structures now when we * have released the table lock instead of when we encountered * them. This since free() isn't for free and we don't want to * unnecessarily block other schedulers. */ while (free_list) { tpep = free_list; free_list = tpep->next; erts_free(ERTS_ALC_T_PROCS_TPROC_EL, tpep); } have_reds -= reds; if (have_reds < 0) have_reds = 0; BUMP_REDS(p, reds); break; } case BUILDING_RESULT: { int conses, ix, min_ix; Eterm *hp; Eterm res = *res_accp; ERTS_PROCS_DBG_VERIFY_PIDS(pbdp); ERTS_PROCS_DBG_CHK_RESLIST(res); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, begin_build_res); have_reds = ERTS_BIF_REDS_LEFT(p); conses = ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED*have_reds; min_ix = pbdp->pid_ix - conses; if (min_ix < 0) { min_ix = 0; conses = pbdp->pid_ix; } hp = HAlloc(p, conses*2); ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(pbdp, hp, conses*2); for (ix = pbdp->pid_ix - 1; ix >= min_ix; ix--) { ERTS_PROCS_ASSERT(is_internal_pid(pbdp->pid[ix])); res = CONS(hp, pbdp->pid[ix], res); hp += 2; } ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(pbdp, hp); pbdp->pid_ix = min_ix; if (min_ix == 0) pbdp->state = RETURN_RESULT; else { pbdp->pid_sz = min_ix; pbdp->pid = erts_realloc(ERTS_ALC_T_PROCS_PIDS, pbdp->pid, sizeof(Eterm)*pbdp->pid_sz); #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS pbdp->debug.pid_started = erts_realloc(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.pid_started, (sizeof(Uint64) * pbdp->pid_sz)); #endif } reds = conses/ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED; BUMP_REDS(p, reds); have_reds -= reds; ERTS_PROCS_DBG_CHK_RESLIST(res); ERTS_PROCS_DBG_TRACE(p->id, processes_bif_engine, end_build_res); *res_accp = res; break; } case RETURN_RESULT: cleanup_processes_bif_data(mbp); return 1; default: erl_exit(ERTS_ABORT_EXIT, "erlang:processes/0: Invalid state: %d\n", (int) pbdp->state); } } while (have_reds || pbdp->state == RETURN_RESULT); return 0; } /* * processes_trap/2 is a hidden BIF that processes/0 traps to. */ static BIF_RETTYPE processes_trap(BIF_ALIST_2) { Eterm res_acc; Binary *mbp; /* * This bif cannot be called from erlang code. It can only be * trapped to from processes/0; therefore, a bad argument * is a processes/0 internal error. */ ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, call); ERTS_PROCS_ASSERT(is_nil(BIF_ARG_1) || is_list(BIF_ARG_1)); res_acc = BIF_ARG_1; ERTS_PROCS_ASSERT(ERTS_TERM_IS_MAGIC_BINARY(BIF_ARG_2)); mbp = ((ProcBin *) binary_val(BIF_ARG_2))->val; ERTS_PROCS_ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(mbp) == cleanup_processes_bif_data); ERTS_PROCS_ASSERT( ((ErtsProcessesBifData *) ERTS_MAGIC_BIN_DATA(mbp))->debug.caller == BIF_P->id); if (processes_bif_engine(BIF_P, &res_acc, mbp)) { ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, return); BIF_RET(res_acc); } else { ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_trap, trap); ERTS_BIF_YIELD2(&processes_trap_export, BIF_P, res_acc, BIF_ARG_2); } } /* * The actual processes/0 BIF. */ BIF_RETTYPE processes_0(BIF_ALIST_0) { /* * A requirement: The list of pids returned should be a consistent * snapshot of all processes existing at some point * in time during the execution of processes/0. Since * processes might terminate while processes/0 is * executing, we have to keep track of terminated * processes and add them to the result. We also * ignore processes created after processes/0 has * begun executing. */ Eterm res_acc = NIL; Binary *mbp = erts_create_magic_binary(sizeof(ErtsProcessesBifData), cleanup_processes_bif_data); ErtsProcessesBifData *pbdp = ERTS_MAGIC_BIN_DATA(mbp); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, call); pbdp->state = INITIALIZING; ERTS_PROCS_DBG_INIT(BIF_P, pbdp); if (ERTS_BIF_REDS_LEFT(BIF_P) >= ERTS_PROCESSES_BIF_MIN_START_REDS && processes_bif_engine(BIF_P, &res_acc, mbp)) { erts_bin_free(mbp); ERTS_PROCS_DBG_CHK_RESLIST(res_acc); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, return); BIF_RET(res_acc); } else { Eterm *hp; Eterm magic_bin; ERTS_PROCS_DBG_CHK_RESLIST(res_acc); hp = HAlloc(BIF_P, PROC_BIN_SIZE); ERTS_PROCS_DBG_SAVE_HEAP_ALLOC(pbdp, hp, PROC_BIN_SIZE); magic_bin = erts_mk_magic_binary_term(&hp, &MSO(BIF_P), mbp); ERTS_PROCS_DBG_VERIFY_HEAP_ALLOC_USED(pbdp, hp); ERTS_PROCS_DBG_TRACE(BIF_P->id, processes_0, trap); ERTS_BIF_YIELD2(&processes_trap_export, BIF_P, res_acc, magic_bin); } } static void init_processes_bif(void) { saved_term_procs.start = NULL; saved_term_procs.end = NULL; processes_bif_tab_chunks = (((erts_proc.max - 1) / ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE) + 1); /* processes_trap/2 is a hidden BIF that the processes/0 BIF traps to. */ erts_init_trap_export(&processes_trap_export, am_erlang, am_processes_trap, 2, &processes_trap); } /* * Debug stuff */ #if defined(ERTS_SMP) && defined(ERTS_ENABLE_LOCK_CHECK) int erts_dbg_check_halloc_lock(Process *p) { if (ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(p)) return 1; if (p->id == ERTS_INVALID_PID) return 1; if (p->scheduler_data && p == p->scheduler_data->match_pseudo_process) return 1; if (erts_thr_progress_is_blocking()) return 1; return 0; } #endif Eterm erts_debug_processes(Process *c_p) { /* This is the old processes/0 BIF. */ int i; Uint need; Eterm res; Eterm* hp; Process *p; Eterm *hp_end; erts_smp_rwmtx_rwlock(&erts_proc_tab_rwmtx); res = NIL; need = erts_process_count() * 2; hp = HAlloc(c_p, need); /* we need two heap words for each pid */ hp_end = hp + need; /* make the list by scanning bakward */ for (i = erts_proc.max-1; i >= 0; i--) { p = erts_pix2proc(i); if (p) { res = CONS(hp, p->id, res); hp += 2; } } erts_smp_rwmtx_rwunlock(&erts_proc_tab_rwmtx); HRelease(c_p, hp_end, hp); return res; } Eterm erts_debug_processes_bif_info(Process *c_p) { ERTS_DECL_AM(processes_bif_info); Eterm elements[] = { AM_processes_bif_info, make_small((Uint) ERTS_PROCESSES_BIF_MIN_START_REDS), make_small((Uint) processes_bif_tab_chunks), make_small((Uint) ERTS_PROCESSES_BIF_TAB_CHUNK_SIZE), make_small((Uint) ERTS_PROCESSES_BIF_TAB_INSPECT_INDICES_PER_RED), make_small((Uint) ERTS_PROCESSES_BIF_TAB_FREE_TERM_PROC_REDS), make_small((Uint) ERTS_PROCESSES_BIF_INSPECT_TERM_PROC_PER_RED), make_small((Uint) ERTS_PROCESSES_INSPECT_TERM_PROC_MAX_REDS), make_small((Uint) ERTS_PROCESSES_BIF_BUILD_RESULT_CONSES_PER_RED), make_small((Uint) ERTS_PROCESSES_BIF_DEBUGLEVEL) }; Uint sz = 0; Eterm *hp; (void) erts_bld_tuplev(NULL, &sz, sizeof(elements)/sizeof(Eterm), elements); hp = HAlloc(c_p, sz); return erts_bld_tuplev(&hp, NULL, sizeof(elements)/sizeof(Eterm), elements); } #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_FOUND_PIDS static void debug_processes_check_found_pid(ErtsProcessesBifData *pbdp, Eterm pid, Uint64 ic, int pid_should_be_found) { int i; for (i = 0; i < pbdp->pid_ix; i++) { if (pbdp->pid[i] == pid && pbdp->debug.pid_started[i] == ic) { ERTS_PROCS_ASSERT(pid_should_be_found); return; } } ERTS_PROCS_ASSERT(!pid_should_be_found); } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_RESLIST static void debug_processes_check_res_list(Eterm list) { while (is_list(list)) { Eterm* consp = list_val(list); Eterm hd = CAR(consp); ERTS_PROCS_ASSERT(is_internal_pid(hd)); list = CDR(consp); } ERTS_PROCS_ASSERT(is_nil(list)); } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS static void debug_processes_save_all_pids(ErtsProcessesBifData *pbdp) { int ix, tix, cpix; pbdp->debug.correct_pids_verified = 0; pbdp->debug.correct_pids = erts_alloc(ERTS_ALC_T_PROCS_PIDS, sizeof(Eterm)*pbdp->pid_sz); for (tix = 0, cpix = 0; tix < erts_proc.max; tix++) { Process *rp = erts_pix2proc(tix); if (rp) { ERTS_PROCS_ASSERT(is_internal_pid(rp->id)); pbdp->debug.correct_pids[cpix++] = rp->id; ERTS_PROCS_ASSERT(cpix <= pbdp->pid_sz); } } ERTS_PROCS_ASSERT(cpix == pbdp->pid_sz); for (ix = 0; ix < pbdp->pid_sz; ix++) pbdp->pid[ix] = make_small(ix); } static void debug_processes_verify_all_pids(ErtsProcessesBifData *pbdp) { int ix, cpix; ERTS_PROCS_ASSERT(pbdp->pid_ix == pbdp->pid_sz); for (ix = 0; ix < pbdp->pid_sz; ix++) { int found = 0; Eterm pid = pbdp->pid[ix]; ERTS_PROCS_ASSERT(is_internal_pid(pid)); for (cpix = ix; cpix < pbdp->pid_sz; cpix++) { if (pbdp->debug.correct_pids[cpix] == pid) { pbdp->debug.correct_pids[cpix] = NIL; found = 1; break; } } if (!found) { for (cpix = 0; cpix < ix; cpix++) { if (pbdp->debug.correct_pids[cpix] == pid) { pbdp->debug.correct_pids[cpix] = NIL; found = 1; break; } } } ERTS_PROCS_ASSERT(found); } pbdp->debug.correct_pids_verified = 1; erts_free(ERTS_ALC_T_PROCS_PIDS, pbdp->debug.correct_pids); pbdp->debug.correct_pids = NULL; } #endif /* ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_PIDS */ #if ERTS_PROCESSES_BIF_DEBUGLEVEL >= ERTS_PROCS_DBGLVL_CHK_TERM_PROC_LIST static void debug_processes_check_term_proc_list(void) { ERTS_SMP_LC_ASSERT(erts_lc_rwmtx_is_rwlocked(&erts_proc_tab_rwmtx)); if (!saved_term_procs.start) ERTS_PROCS_ASSERT(!saved_term_procs.end); else { Uint64 curr_interval = get_proc_interval(); Uint64 *prev_x_interval_p = NULL; ErtsTermProcElement *tpep; for (tpep = saved_term_procs.start; tpep; tpep = tpep->next) { if (!tpep->prev) ERTS_PROCS_ASSERT(saved_term_procs.start == tpep); else ERTS_PROCS_ASSERT(tpep->prev->next == tpep); if (!tpep->next) ERTS_PROCS_ASSERT(saved_term_procs.end == tpep); else ERTS_PROCS_ASSERT(tpep->next->prev == tpep); if (tpep->ix < 0) { Uint64 interval = tpep->u.bif_invocation.interval; ERTS_PROCS_ASSERT(interval <= curr_interval); } else { Uint64 s_interval = tpep->u.process.spawned; Uint64 x_interval = tpep->u.process.exited; ERTS_PROCS_ASSERT(s_interval <= x_interval); if (prev_x_interval_p) ERTS_PROCS_ASSERT(*prev_x_interval_p <= x_interval); prev_x_interval_p = &tpep->u.process.exited; ERTS_PROCS_ASSERT(is_internal_pid(tpep->u.process.pid)); ERTS_PROCS_ASSERT(tpep->ix == internal_pid_index(tpep->u.process.pid)); } } } } static void debug_processes_check_term_proc_free_list(ErtsTermProcElement *free_list) { if (saved_term_procs.start) { ErtsTermProcElement *ftpep; ErtsTermProcElement *tpep; for (ftpep = free_list; ftpep; ftpep = ftpep->next) { for (tpep = saved_term_procs.start; tpep; tpep = tpep->next) ERTS_PROCS_ASSERT(ftpep != tpep); } } } #endif #if ERTS_PROCESSES_BIF_DEBUGLEVEL != 0 static void debug_processes_assert_error(char* expr, char* file, int line) { fflush(stdout); erts_fprintf(stderr, "%s:%d: Assertion failed: %s\n", file, line, expr); fflush(stderr); abort(); } #endif /* *\ * End of the processes/0 BIF implementation. * \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ /* * A nice system halt closing all open port goes as follows: * 1) This function schedules the aux work ERTS_SSI_AUX_WORK_REAP_PORTS * on all schedulers, then schedules itself out. * 2) All shedulers detect this and set the flag halt_in_progress * on their run queue. The last scheduler sets all non-closed ports * ERTS_PORT_SFLG_HALT. Global atomic erts_halt_progress is used * as refcount to determine which is last. * 3) While the run ques has flag halt_in_progress no processes * will be scheduled, only ports. * 4) When the last port closes that scheduler calls erlang:halt/1. * The same global atomic is used as refcount. * * A BIF that calls this should make sure to schedule out to never come back: * erl_halt((int)(- code)); * ERTS_BIF_YIELD1(bif_export[BIF_erlang_halt_1], BIF_P, NIL); */ void erl_halt(int code) { if (-1 == erts_smp_atomic32_cmpxchg_acqb(&erts_halt_progress, erts_no_schedulers, -1)) { erts_halt_code = code; notify_reap_ports_relb(); } }