diff options
Diffstat (limited to 'erts/emulator/beam/erl_process.c')
-rw-r--r-- | erts/emulator/beam/erl_process.c | 208 |
1 files changed, 154 insertions, 54 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c index 31f23d3978..2704359a8f 100644 --- a/erts/emulator/beam/erl_process.c +++ b/erts/emulator/beam/erl_process.c @@ -166,9 +166,8 @@ static struct { static struct { erts_smp_mtx_t update_mtx; - erts_smp_atomic32_t active_runqs; + erts_smp_atomic32_t no_runqs; int last_active_runqs; - erts_smp_atomic32_t used_runqs; int forced_check_balance; erts_smp_atomic32_t checking_balance; int halftime; @@ -965,7 +964,7 @@ sched_spin_wait(ErtsSchedulerSleepInfo *ssi, int spincount) erts_aint32_t flgs; do { - flgs = erts_smp_atomic32_read(&ssi->flags); + 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; @@ -1114,7 +1113,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq) else { erts_aint_t dt; - erts_smp_atomic32_set(&function_calls, 0); + erts_smp_atomic32_set_relb(&function_calls, 0); *fcalls = 0; sched_waiting_sys(esdp->no, rq); @@ -1147,7 +1146,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq) nonblockable_aux_work(esdp, ssi, aux_work); #endif - flgs = erts_smp_atomic32_read(&ssi->flags); + flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_WAITING)) { ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING)); goto sys_woken; @@ -1333,6 +1332,76 @@ wake_all_schedulers(void) } } +#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(&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(&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(&balance_info.no_runqs); + while (1) { + erts_aint32_t act, new; + new = (used << ERTS_NO_USED_RUNQS_SHIFT) | (exp & ERTS_NO_RUNQS_MASK); + act = erts_smp_atomic32_cmpxchg(&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(&balance_info.no_runqs); + while (1) { + erts_aint32_t act, new; + new = (exp & (ERTS_NO_RUNQS_MASK << ERTS_NO_USED_RUNQS_SHIFT)) | active; + act = erts_smp_atomic32_cmpxchg(&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(&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) | active; + act = erts_smp_atomic32_cmpxchg(&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) { @@ -1344,9 +1413,7 @@ chk_wake_sched(ErtsRunQueue *crq, int ix, int activate) iflgs = erts_smp_atomic32_read(&wrq->info_flags); if (!(iflgs & (ERTS_RUNQ_IFLG_SUSPENDED|ERTS_RUNQ_IFLG_NONEMPTY))) { if (activate) { - if (ix == erts_smp_atomic32_cmpxchg(&balance_info.active_runqs, - ix+1, - ix)) { + if (try_inc_no_active_runqs(ix+1)) { erts_smp_xrunq_lock(crq, wrq); wrq->flags &= ~ERTS_RUNQ_FLG_INACTIVE; erts_smp_xrunq_unlock(crq, wrq); @@ -1363,8 +1430,9 @@ wake_scheduler_on_empty_runq(ErtsRunQueue *crq) { int ix = crq->ix; int stop_ix = ix; - int active_ix = erts_smp_atomic32_read(&balance_info.active_runqs); - int balance_ix = erts_smp_atomic32_read(&balance_info.used_runqs); + int active_ix, balance_ix; + + get_no_runqs(&active_ix, &balance_ix); if (active_ix > balance_ix) active_ix = balance_ix; @@ -1416,7 +1484,7 @@ erts_sched_notify_check_cpu_bind(void) int ix; if (erts_common_run_queue) { for (ix = 0; ix < erts_no_schedulers; ix++) - erts_smp_atomic32_set(&ERTS_SCHEDULER_IX(ix)->chk_cpu_bind, 1); + erts_smp_atomic32_set_relb(&ERTS_SCHEDULER_IX(ix)->chk_cpu_bind, 1); wake_all_schedulers(); } else { @@ -1871,8 +1939,7 @@ try_steal_task(ErtsRunQueue *rq) ERTS_SMP_LC_CHK_RUNQ_LOCK(rq, rq_locked); - active_rqs = erts_smp_atomic32_read(&balance_info.active_runqs); - blnc_rqs = erts_smp_atomic32_read(&balance_info.used_runqs); + get_no_runqs(&active_rqs, &blnc_rqs); if (active_rqs > blnc_rqs) active_rqs = blnc_rqs; @@ -1883,7 +1950,7 @@ try_steal_task(ErtsRunQueue *rq) 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(&no_empty_run_queues) < blnc_rqs) { + 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; @@ -1898,7 +1965,7 @@ try_steal_task(ErtsRunQueue *rq) vix = rq->ix; /* ... then try to steal a job from another active queue... */ - while (erts_smp_atomic32_read(&no_empty_run_queues) < blnc_rqs) { + while (erts_smp_atomic32_read_acqb(&no_empty_run_queues) < blnc_rqs) { vix++; if (vix >= active_rqs) vix = 0; @@ -1999,7 +2066,7 @@ check_balance(ErtsRunQueue *c_rq) return; } - blnc_no_rqs = (int) erts_smp_atomic32_read(&balance_info.used_runqs); + get_no_runqs(NULL, &blnc_no_rqs); if (blnc_no_rqs == 1) { c_rq->check_balance_reds = INT_MAX; erts_smp_atomic32_set(&balance_info.checking_balance, 0); @@ -2038,7 +2105,8 @@ check_balance(ErtsRunQueue *c_rq) forced = balance_info.forced_check_balance; balance_info.forced_check_balance = 0; - blnc_no_rqs = (int) erts_smp_atomic32_read(&balance_info.used_runqs); + 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); @@ -2052,8 +2120,6 @@ check_balance(ErtsRunQueue *c_rq) if (balance_info.full_reds_history_index >= ERTS_FULL_REDS_HISTORY_SIZE) balance_info.full_reds_history_index = 0; - current_active = erts_smp_atomic32_read(&balance_info.active_runqs); - /* Read balance information for all run queues */ for (qix = 0; qix < blnc_no_rqs; qix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(qix); @@ -2387,7 +2453,7 @@ erts_fprintf(stderr, "--------------------------------\n"); } balance_info.last_active_runqs = active; - erts_smp_atomic32_set(&balance_info.active_runqs, active); + set_no_active_runqs(active); balance_info.halftime = 1; erts_smp_atomic32_set(&balance_info.checking_balance, 0); @@ -2695,9 +2761,8 @@ erts_init_scheduling(int mrq, int no_schedulers, int no_schedulers_online) erts_smp_atomic32_init(&schdlr_sspnd.msb.ongoing, 0); erts_smp_atomic32_init(&schdlr_sspnd.active, no_schedulers); schdlr_sspnd.msb.procs = NULL; - erts_smp_atomic32_set(&balance_info.used_runqs, - erts_common_run_queue ? 1 : no_schedulers_online); - erts_smp_atomic32_init(&balance_info.active_runqs, no_schedulers); + init_no_runqs(no_schedulers, + erts_common_run_queue ? 1 : 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; @@ -2939,7 +3004,7 @@ sched_spin_suspended(ErtsSchedulerSleepInfo *ssi, int spincount) erts_aint32_t flgs; do { - flgs = erts_smp_atomic32_read(&ssi->flags); + flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if ((flgs & (ERTS_SSI_FLG_SLEEPING | ERTS_SSI_FLG_WAITING | ERTS_SSI_FLG_SUSPENDED)) @@ -3068,7 +3133,7 @@ suspend_scheduler(ErtsSchedulerData *esdp) wake = 0; } - flgs = erts_smp_atomic32_read(&ssi->flags); + flgs = erts_smp_atomic32_read_acqb(&ssi->flags); if (!(flgs & ERTS_SSI_FLG_SUSPENDED)) break; erts_smp_mtx_unlock(&schdlr_sspnd.mtx); @@ -3292,7 +3357,7 @@ erts_set_schedulers_online(Process *p, ErtsRunQueue *to_rq = ERTS_RUNQ_IX(ix % no); evacuate_run_queue(from_rq, to_rq); } - erts_smp_atomic32_set(&balance_info.used_runqs, no); + set_no_used_runqs(no); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); } @@ -3346,7 +3411,7 @@ erts_set_schedulers_online(Process *p, for (ix = erts_no_run_queues-1; ix >= no; ix--) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(ix % no)); - erts_smp_atomic32_set(&balance_info.used_runqs, no); + set_no_used_runqs(no); erts_smp_mtx_unlock(&balance_info.update_mtx); erts_smp_mtx_lock(&schdlr_sspnd.mtx); for (ix = no; ix < online; ix++) { @@ -3443,7 +3508,7 @@ erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int all) else { erts_smp_mtx_unlock(&schdlr_sspnd.mtx); erts_smp_mtx_lock(&balance_info.update_mtx); - erts_smp_atomic32_set(&balance_info.used_runqs, 1); + set_no_used_runqs(1); for (ix = 0; ix < online; ix++) { ErtsRunQueue *rq = ERTS_RUNQ_IX(ix); erts_smp_runq_lock(rq); @@ -3580,7 +3645,7 @@ erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int all) evacuate_run_queue(ERTS_RUNQ_IX(ix), ERTS_RUNQ_IX(ix % online)); - erts_smp_atomic32_set(&balance_info.used_runqs, online); + set_no_used_runqs(online); /* Make sure that we balance soon... */ balance_info.forced_check_balance = 1; erts_smp_runq_lock(ERTS_RUNQ_IX(0)); @@ -3887,21 +3952,9 @@ handle_pend_sync_suspend(Process *suspendee, } } -/* - * 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) +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; @@ -3928,7 +3981,7 @@ erts_pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, c_p->suspendee = NIL; ASSERT(c_p->flags & F_P2PNR_RESCHED); c_p->flags &= ~F_P2PNR_RESCHED; - if (rp) + if (!suspend && rp) resume_process(rp); } else { @@ -3992,6 +4045,8 @@ erts_pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, } /* rp is not running and we got the locks we want... */ + if (suspend) + suspend_process(rp_rq, rp); } erts_smp_runqs_unlock(cp_rq, rp_rq); } @@ -4004,6 +4059,35 @@ erts_pid2proc_not_running(Process *c_p, ErtsProcLocks c_p_locks, 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 @@ -4117,6 +4201,21 @@ handle_pend_bif_async_suspend(Process *suspendee, } } +#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 */ /* @@ -4650,7 +4749,7 @@ internal_add_to_runq(ErtsRunQueue *runq, Process *p) if (p->status_flags & ERTS_PROC_SFLG_INRUNQ) return NULL; else if (p->runq_flags & ERTS_PROC_RUNQ_FLG_RUNNING) { - ASSERT(p->rcount == 0); + ASSERT(ERTS_PROC_IS_EXITING(p) || p->rcount == 0); ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(runq, p); p->status_flags |= ERTS_PROC_SFLG_PENDADD2SCHEDQ; return NULL; @@ -4661,7 +4760,7 @@ internal_add_to_runq(ErtsRunQueue *runq, Process *p) ERTS_DBG_CHK_PROCS_RUNQ_NOPROC(runq, p); #ifndef ERTS_SMP /* Never schedule a suspended process (ok in smp case) */ - ASSERT(p->rcount == 0); + ASSERT(ERTS_PROC_IS_EXITING(p) || p->rcount == 0); add_runq = runq; #else ASSERT(!p->bound_runq || p->bound_runq == p->run_queue); @@ -5097,7 +5196,7 @@ Process *schedule(Process *p, int calls) esdp = erts_get_scheduler_data(); rq = erts_get_runq_current(esdp); ASSERT(esdp); - fcalls = (int) erts_smp_atomic32_read(&function_calls); + fcalls = (int) erts_smp_atomic32_read_acqb(&function_calls); actual_reds = reds = 0; erts_smp_runq_lock(rq); } else { @@ -5248,14 +5347,14 @@ Process *schedule(Process *p, int calls) | ERTS_RUNQ_FLG_CHK_CPU_BIND | ERTS_RUNQ_FLG_SUSPENDED)) { if ((rq->flags & ERTS_RUNQ_FLG_SUSPENDED) - || (erts_smp_atomic32_read(&esdp->ssi->flags) + || (erts_smp_atomic32_read_acqb(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED)) { ASSERT(erts_smp_atomic32_read(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED); suspend_scheduler(esdp); } if ((rq->flags & ERTS_RUNQ_FLG_CHK_CPU_BIND) - || erts_smp_atomic32_read(&esdp->chk_cpu_bind)) { + || erts_smp_atomic32_read_acqb(&esdp->chk_cpu_bind)) { erts_sched_check_cpu_bind(esdp); } } @@ -5306,7 +5405,7 @@ Process *schedule(Process *p, int calls) if (rq->flags & (ERTS_RUNQ_FLG_SHARED_RUNQ | ERTS_RUNQ_FLG_SUSPENDED)) { if ((rq->flags & ERTS_RUNQ_FLG_SUSPENDED) - || (erts_smp_atomic32_read(&esdp->ssi->flags) + || (erts_smp_atomic32_read_acqb(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED)) { ASSERT(erts_smp_atomic32_read(&esdp->ssi->flags) & ERTS_SSI_FLG_SUSPENDED); @@ -5350,7 +5449,7 @@ Process *schedule(Process *p, int calls) * Schedule system-level activities. */ - erts_smp_atomic32_set(&function_calls, 0); + erts_smp_atomic32_set_relb(&function_calls, 0); fcalls = 0; ASSERT(!erts_port_task_have_outstanding_io_tasks()); @@ -5392,7 +5491,7 @@ Process *schedule(Process *p, int calls) if (erts_common_run_queue->waiting) wake_scheduler(erts_common_run_queue, 0, 1); } - else if (erts_smp_atomic32_read(&no_empty_run_queues) != 0) { + else if (erts_smp_atomic32_read_acqb(&no_empty_run_queues) != 0) { wake_scheduler_on_empty_runq(rq); rq->wakeup_other = 0; } @@ -7603,7 +7702,8 @@ continue_exit_process(Process *p static void timeout_proc(Process* p) { - p->i = *((BeamInstr **) (UWord) p->def_arg_reg); + BeamInstr** pi = (BeamInstr **) p->def_arg_reg; + p->i = *pi; p->flags |= F_TIMO; p->flags &= ~F_INSLPQUEUE; |