diff options
Diffstat (limited to 'erts/emulator/beam/erl_ptab.c')
-rw-r--r-- | erts/emulator/beam/erl_ptab.c | 393 |
1 files changed, 300 insertions, 93 deletions
diff --git a/erts/emulator/beam/erl_ptab.c b/erts/emulator/beam/erl_ptab.c index 87beeafa1a..eabf016081 100644 --- a/erts/emulator/beam/erl_ptab.c +++ b/erts/emulator/beam/erl_ptab.c @@ -1,7 +1,7 @@ /* * %CopyrightBegin% * - * Copyright Ericsson AB 2012. All Rights Reserved. + * Copyright Ericsson AB 2012-2013. 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 @@ -34,6 +34,8 @@ typedef struct ErtsPTabListBifData_ ErtsPTabListBifData; +#define ERTS_PTAB_NEW_MAX_RESERVE_FAIL 1000 + #define ERTS_PTAB_LIST_BIF_TAB_INSPECT_INDICES_PER_RED 25 #define ERTS_PTAB_LIST_BIF_TAB_CHUNK_SIZE 1000 #define ERTS_PTAB_LIST_BIF_MIN_START_REDS \ @@ -415,16 +417,39 @@ last_data_cmp(Uint64 ld1, Uint64 ld2) #define ERTS_PTAB_LastData2EtermData(LD) \ ((Eterm) ((LD) & ~(~((Uint64) 0) << ERTS_PTAB_ID_DATA_SIZE))) +static ERTS_INLINE Uint32 +ix_to_free_id_data_ix(ErtsPTab *ptab, Uint32 ix) +{ + Uint32 dix; + + dix = ((ix & ptab->r.o.dix_cl_mask) << ptab->r.o.dix_cl_shift); + dix += ((ix >> ptab->r.o.dix_cli_shift) & ptab->r.o.dix_cli_mask); + ASSERT(0 <= dix && dix < ptab->r.o.max); + return dix; +} + +UWord +erts_ptab_mem_size(ErtsPTab *ptab) +{ + UWord size = ptab->r.o.max*sizeof(erts_smp_atomic_t); + if (ptab->r.o.free_id_data) + size += ptab->r.o.max*sizeof(erts_smp_atomic32_t); + return size; +} + + void erts_ptab_init_table(ErtsPTab *ptab, ErtsAlcType_t atype, void (*release_element)(void *), ErtsPTabElementCommon *invalid_element, int size, - char *name) + UWord element_size, + char *name, + int legacy) { - size_t tab_sz; - int bits; + size_t tab_sz, alloc_sz; + Uint32 bits, cl, cli, ix, ix_per_cache_line, tab_cache_lines; char *tab_end; erts_smp_atomic_t *tab_entry; erts_smp_rwmtx_opt_t rwmtx_opts = ERTS_SMP_RWMTX_OPT_DEFAULT_INITER; @@ -443,10 +468,14 @@ erts_ptab_init_table(ErtsPTab *ptab, bits = erts_fit_in_bits_int32((Sint32) size - 1); } + ptab->r.o.element_size = element_size; ptab->r.o.max = size; tab_sz = ERTS_ALC_CACHE_LINE_ALIGN_SIZE(size*sizeof(erts_smp_atomic_t)); - ptab->r.o.tab = erts_alloc_permanent_cache_aligned(atype, tab_sz); + alloc_sz = tab_sz; + if (!legacy) + alloc_sz += ERTS_ALC_CACHE_LINE_ALIGN_SIZE(size*sizeof(erts_smp_atomic32_t)); + ptab->r.o.tab = erts_alloc_permanent_cache_aligned(atype, alloc_sz); tab_end = ((char *) ptab->r.o.tab) + tab_sz; tab_entry = ptab->r.o.tab; while (tab_end > ((char *) tab_entry)) { @@ -454,25 +483,17 @@ erts_ptab_init_table(ErtsPTab *ptab, tab_entry++; } - ptab->r.o.tab_cache_lines = tab_sz/ERTS_CACHE_LINE_SIZE; - ptab->r.o.pix_per_cache_line = (ERTS_CACHE_LINE_SIZE - / sizeof(erts_smp_atomic_t)); + tab_cache_lines = tab_sz/ERTS_CACHE_LINE_SIZE; + ix_per_cache_line = (ERTS_CACHE_LINE_SIZE/sizeof(erts_smp_atomic_t)); ASSERT((ptab->r.o.max & (ptab->r.o.max - 1)) == 0); /* power of 2 */ - ASSERT((ptab->r.o.pix_per_cache_line - & (ptab->r.o.pix_per_cache_line - 1)) == 0); /* power of 2 */ - ASSERT((ptab->r.o.tab_cache_lines - & (ptab->r.o.tab_cache_lines - 1)) == 0); /* power of 2 */ - - ptab->r.o.pix_mask - = (1 << bits) - 1; - ptab->r.o.pix_cl_mask - = ptab->r.o.tab_cache_lines-1; - ptab->r.o.pix_cl_shift - = erts_fit_in_bits_int32(ptab->r.o.pix_per_cache_line-1); - ptab->r.o.pix_cli_shift - = erts_fit_in_bits_int32(ptab->r.o.pix_cl_mask); - ptab->r.o.pix_cli_mask - = (1 << (bits - ptab->r.o.pix_cli_shift)) - 1; + ASSERT((ix_per_cache_line & (ix_per_cache_line - 1)) == 0); /* power of 2 */ + ASSERT((tab_cache_lines & (tab_cache_lines - 1)) == 0); /* power of 2 */ + + ptab->r.o.pix_mask = (1 << bits) - 1; + ptab->r.o.pix_cl_mask = tab_cache_lines-1; + ptab->r.o.pix_cl_shift = erts_fit_in_bits_int32(ix_per_cache_line-1); + ptab->r.o.pix_cli_shift = erts_fit_in_bits_int32(ptab->r.o.pix_cl_mask); + ptab->r.o.pix_cli_mask = (1 << (bits - ptab->r.o.pix_cli_shift)) - 1; ASSERT(ptab->r.o.pix_cl_shift + ptab->r.o.pix_cli_shift == bits); @@ -480,6 +501,46 @@ erts_ptab_init_table(ErtsPTab *ptab, ptab->r.o.invalid_data = erts_ptab_id2data(ptab, invalid_element->id); ptab->r.o.release_element = release_element; + if (legacy) { + ptab->r.o.free_id_data = NULL; + ptab->r.o.dix_cl_mask = 0; + ptab->r.o.dix_cl_shift = 0; + ptab->r.o.dix_cli_shift = 0; + ptab->r.o.dix_cli_mask = 0; + } + else { + + tab_sz = ERTS_ALC_CACHE_LINE_ALIGN_SIZE(size*sizeof(erts_smp_atomic32_t)); + ptab->r.o.free_id_data = (erts_smp_atomic32_t *) tab_end; + + tab_cache_lines = tab_sz/ERTS_CACHE_LINE_SIZE; + ix_per_cache_line = (ERTS_CACHE_LINE_SIZE/sizeof(erts_smp_atomic32_t)); + + ptab->r.o.dix_cl_mask = tab_cache_lines-1; + ptab->r.o.dix_cl_shift = erts_fit_in_bits_int32(ix_per_cache_line-1); + ptab->r.o.dix_cli_shift = erts_fit_in_bits_int32(ptab->r.o.dix_cl_mask); + ptab->r.o.dix_cli_mask = (1 << (bits - ptab->r.o.dix_cli_shift)) - 1; + + ASSERT((ix_per_cache_line & (ix_per_cache_line - 1)) == 0); /* power of 2 */ + ASSERT((tab_cache_lines & (tab_cache_lines - 1)) == 0); /* power of 2 */ + + ASSERT(ptab->r.o.dix_cl_shift + ptab->r.o.dix_cli_shift == bits); + + ix = 0; + for (cl = 0; cl < tab_cache_lines; cl++) { + for (cli = 0; cli < ix_per_cache_line; cli++) { + erts_smp_atomic32_init_nob(&ptab->r.o.free_id_data[ix], + cli*tab_cache_lines+cl); + ASSERT(erts_smp_atomic32_read_nob(&ptab->r.o.free_id_data[ix]) != ptab->r.o.invalid_data); + ix++; + } + } + + erts_smp_atomic32_init_nob(&ptab->vola.tile.aid_ix, -1); + erts_smp_atomic32_init_nob(&ptab->vola.tile.fid_ix, -1); + + } + erts_smp_interval_init(&ptab->list.data.interval); ptab->list.data.deleted.start = NULL; ptab->list.data.deleted.end = NULL; @@ -520,9 +581,7 @@ erts_ptab_new_element(ErtsPTab *ptab, void *init_arg, void (*init_ptab_el)(void *, Eterm)) { - int pix; - Uint64 ld, exp_ld; - Eterm data; + Uint32 pix, ix, data; erts_aint32_t count; erts_aint_t invalid = (erts_aint_t) ptab->r.o.invalid_element; @@ -549,62 +608,110 @@ erts_ptab_new_element(ErtsPTab *ptab, ptab_el->u.alive.started_interval = erts_smp_current_interval_nob(erts_ptab_interval(ptab)); - ld = last_data_read_acqb(ptab); + if (ptab->r.o.free_id_data) { + do { + ix = (Uint32) erts_smp_atomic32_inc_read_acqb(&ptab->vola.tile.aid_ix); + ix = ix_to_free_id_data_ix(ptab, ix); - /* Reserve slot */ - while (1) { - ld++; - pix = erts_ptab_data2pix(ptab, ERTS_PTAB_LastData2EtermData(ld)); - if (erts_smp_atomic_read_nob(&ptab->r.o.tab[pix]) == ERTS_AINT_NULL) { - erts_aint_t val; - val = erts_smp_atomic_cmpxchg_relb(&ptab->r.o.tab[pix], - invalid, - ERTS_AINT_NULL); + data = erts_smp_atomic32_xchg_nob(&ptab->r.o.free_id_data[ix], + (erts_aint32_t)ptab->r.o.invalid_data); + }while ((Eterm)data == ptab->r.o.invalid_data); + + init_ptab_el(init_arg, (Eterm) data); + +#ifdef ERTS_SMP + erts_smp_atomic32_init_nob(&ptab_el->refc, 1); +#endif + + pix = erts_ptab_data2pix(ptab, (Eterm) data); + +#ifdef DEBUG + ASSERT(ERTS_AINT_NULL == erts_smp_atomic_xchg_relb(&ptab->r.o.tab[pix], + (erts_aint_t) ptab_el)); +#else + erts_smp_atomic_set_relb(&ptab->r.o.tab[pix], (erts_aint_t) ptab_el); +#endif + + erts_ptab_runlock(ptab); - if (ERTS_AINT_NULL == val) - break; - } } + else { + int rlocked = ERTS_PTAB_NEW_MAX_RESERVE_FAIL; + Uint64 ld, exp_ld; + /* Deprecated legacy algorithm... */ - data = ERTS_PTAB_LastData2EtermData(ld); + restart: + + ptab_el->u.alive.started_interval + = erts_smp_current_interval_nob(erts_ptab_interval(ptab)); + + ld = last_data_read_acqb(ptab); + + /* Reserve slot */ + while (1) { + ld++; + pix = erts_ptab_data2pix(ptab, ERTS_PTAB_LastData2EtermData(ld)); + if (erts_smp_atomic_read_nob(&ptab->r.o.tab[pix]) + == ERTS_AINT_NULL) { + erts_aint_t val; + val = erts_smp_atomic_cmpxchg_relb(&ptab->r.o.tab[pix], + invalid, + ERTS_AINT_NULL); + + if (ERTS_AINT_NULL == val) + break; + } + if (rlocked && --rlocked == 0) { + erts_ptab_runlock(ptab); + erts_ptab_rwlock(ptab); + goto restart; + } + } - if (data == ptab->r.o.invalid_data) { - /* Do not use invalid data; fix it... */ - ld += ptab->r.o.max; - ASSERT(pix == erts_ptab_data2pix(ptab, - ERTS_PTAB_LastData2EtermData(ld))); data = ERTS_PTAB_LastData2EtermData(ld); - ASSERT(data != ptab->r.o.invalid_data); - } - exp_ld = last_data_read_nob(ptab); + if (data == ptab->r.o.invalid_data) { + /* Do not use invalid data; fix it... */ + ld += ptab->r.o.max; + ASSERT(pix == erts_ptab_data2pix(ptab, + ERTS_PTAB_LastData2EtermData(ld))); + data = ERTS_PTAB_LastData2EtermData(ld); + ASSERT(data != ptab->r.o.invalid_data); + } + + exp_ld = last_data_read_nob(ptab); - /* Move last data forward */ - while (1) { - Uint64 act_ld; - if (last_data_cmp(ld, exp_ld) < 0) - break; - act_ld = last_data_cmpxchg_relb(ptab, ld, exp_ld); - if (act_ld == exp_ld) - break; - exp_ld = act_ld; - } + /* Move last data forward */ + while (1) { + Uint64 act_ld; + if (last_data_cmp(ld, exp_ld) < 0) + break; + act_ld = last_data_cmpxchg_relb(ptab, ld, exp_ld); + if (act_ld == exp_ld) + break; + exp_ld = act_ld; + } - init_ptab_el(init_arg, data); + init_ptab_el(init_arg, data); #ifdef ERTS_SMP - erts_smp_atomic32_init_nob(&ptab_el->refc, 1); + erts_smp_atomic32_init_nob(&ptab_el->refc, 1); #endif - /* Move into slot reserved */ + /* Move into slot reserved */ #ifdef DEBUG - ASSERT(invalid == erts_smp_atomic_xchg_relb(&ptab->r.o.tab[pix], + ASSERT(invalid == erts_smp_atomic_xchg_relb(&ptab->r.o.tab[pix], (erts_aint_t) ptab_el)); #else - erts_smp_atomic_set_relb(&ptab->r.o.tab[pix], (erts_aint_t) ptab_el); + erts_smp_atomic_set_relb(&ptab->r.o.tab[pix], (erts_aint_t) ptab_el); #endif - erts_ptab_runlock(ptab); + if (rlocked) + erts_ptab_runlock(ptab); + else + erts_ptab_rwunlock(ptab); + + } return 1; } @@ -645,9 +752,12 @@ erts_ptab_delete_element(ErtsPTab *ptab, ErtsPTabElementCommon *ptab_el) { int maybe_save; - int pix = erts_ptab_id2pix(ptab, ptab_el->id); + Uint32 pix, ix, data; + + pix = erts_ptab_id2pix(ptab, ptab_el->id); - ASSERT(erts_get_scheduler_id()); /* *Need* to be a scheduler */ + /* *Need* to be an managed thread */ + ERTS_SMP_LC_ASSERT(erts_thr_progress_is_managed_thread()); erts_ptab_rlock(ptab); maybe_save = ptab->list.data.deleted.end != NULL; @@ -658,6 +768,29 @@ erts_ptab_delete_element(ErtsPTab *ptab, erts_smp_atomic_set_relb(&ptab->r.o.tab[pix], ERTS_AINT_NULL); + if (ptab->r.o.free_id_data) { + Uint32 prev_data; + /* Next data for this slot... */ + data = (Uint32) erts_ptab_id2data(ptab, ptab_el->id); + data += ptab->r.o.max; + data &= ~(~((Uint32) 0) << ERTS_PTAB_ID_DATA_SIZE); + if (data == ptab->r.o.invalid_data) { /* make sure not invalid */ + data += ptab->r.o.max; + data &= ~(~((Uint32) 0) << ERTS_PTAB_ID_DATA_SIZE); + } + ASSERT(data != ptab->r.o.invalid_data); + ASSERT(pix == erts_ptab_data2pix(ptab, data)); + + do { + ix = (Uint32) erts_smp_atomic32_inc_read_relb(&ptab->vola.tile.fid_ix); + ix = ix_to_free_id_data_ix(ptab, ix); + + prev_data = erts_smp_atomic32_cmpxchg_nob(&ptab->r.o.free_id_data[ix], + data, + ptab->r.o.invalid_data); + }while ((Eterm)prev_data != ptab->r.o.invalid_data); + } + ASSERT(erts_smp_atomic32_read_nob(&ptab->vola.tile.count) > 0); erts_smp_atomic32_dec_relb(&ptab->vola.tile.count); @@ -670,9 +803,10 @@ erts_ptab_delete_element(ErtsPTab *ptab, } if (ptab->r.o.release_element) - erts_schedule_thr_prgr_later_op(ptab->r.o.release_element, - (void *) ptab_el, - &ptab_el->u.release); + erts_schedule_thr_prgr_later_cleanup_op(ptab->r.o.release_element, + (void *) ptab_el, + &ptab_el->u.release, + ptab->r.o.element_size); } /* @@ -1267,6 +1401,31 @@ erts_ptab_init(void) * Debug stuff */ +static void assert_ptab_consistency(ErtsPTab *ptab) +{ +#ifdef DEBUG + if (ptab->r.o.free_id_data) { + Uint32 ix, pix, data; + int free_pids = 0; + int null_slots = 0; + + for (ix=0; ix < ptab->r.o.max; ix++) { + if (erts_smp_atomic32_read_nob(&ptab->r.o.free_id_data[ix]) != ptab->r.o.invalid_data) { + ++free_pids; + data = erts_smp_atomic32_read_nob(&ptab->r.o.free_id_data[ix]); + pix = erts_ptab_data2pix(ptab, (Eterm) data); + ASSERT(erts_ptab_pix2intptr_nob(ptab, pix) == ERTS_AINT_NULL); + } + if (erts_smp_atomic_read_nob(&ptab->r.o.tab[ix]) == ERTS_AINT_NULL) { + ++null_slots; + } + } + ASSERT(free_pids == null_slots); + ASSERT(free_pids == ptab->r.o.max - erts_smp_atomic32_read_nob(&ptab->vola.tile.count)); + } +#endif +} + Sint erts_ptab_test_next_id(ErtsPTab *ptab, int set, Uint next) { @@ -1277,45 +1436,93 @@ erts_ptab_test_next_id(ErtsPTab *ptab, int set, Uint next) erts_ptab_rwlock(ptab); - if (!set) - ld = last_data_read_nob(ptab); - else { + assert_ptab_consistency(ptab); - ld = (Uint64) next; - data = ERTS_PTAB_LastData2EtermData(ld); - if (ptab->r.o.invalid_data == data) { - ld += ptab->r.o.max; - ASSERT(erts_ptab_data2pix(ptab, data) - == erts_ptab_data2pix(ptab, - ERTS_PTAB_LastData2EtermData(ld))); + if (ptab->r.o.free_id_data) { + Uint32 id_ix, dix; + + if (set) { + Uint32 i, max_ix, num, stop_id_ix; + max_ix = ptab->r.o.max - 1; + num = next; + id_ix = (Uint32) erts_smp_atomic32_read_nob(&ptab->vola.tile.aid_ix); + + for (i=0; i <= max_ix; ++i) { + Uint32 pix; + ++num; + num &= ~(~((Uint32) 0) << ERTS_PTAB_ID_DATA_SIZE); + if (num == ptab->r.o.invalid_data) { + num += ptab->r.o.max; + num &= ~(~((Uint32) 0) << ERTS_PTAB_ID_DATA_SIZE); + } + pix = erts_ptab_data2pix(ptab, num); + if (ERTS_AINT_NULL == erts_ptab_pix2intptr_nob(ptab, pix)) { + ++id_ix; + dix = ix_to_free_id_data_ix(ptab, id_ix); + erts_smp_atomic32_set_nob(&ptab->r.o.free_id_data[dix], num); + ASSERT(pix == erts_ptab_data2pix(ptab, num)); + } + } + erts_smp_atomic32_set_nob(&ptab->vola.tile.fid_ix, id_ix); + + /* Write invalid_data in rest of free_id_data[]: */ + stop_id_ix = (1 + erts_smp_atomic32_read_nob(&ptab->vola.tile.aid_ix)) & max_ix; + while (1) { + id_ix = (id_ix+1) & max_ix; + if (id_ix == stop_id_ix) + break; + dix = ix_to_free_id_data_ix(ptab, id_ix); + erts_smp_atomic32_set_nob(&ptab->r.o.free_id_data[dix], + ptab->r.o.invalid_data); + } } - last_data_set_relb(ptab, ld); + id_ix = (Uint32) erts_smp_atomic32_read_nob(&ptab->vola.tile.aid_ix) + 1; + dix = ix_to_free_id_data_ix(ptab, id_ix); + res = (Sint) erts_smp_atomic32_read_nob(&ptab->r.o.free_id_data[dix]); } + else { + /* Deprecated legacy algorithm... */ + if (!set) + ld = last_data_read_nob(ptab); + else { - while (1) { - int pix; - ld++; - pix = (int) (ld % ptab->r.o.max); - if (first_pix < 0) - first_pix = pix; - else if (pix == first_pix) { - res = -1; - break; - } - if (ERTS_AINT_NULL == erts_ptab_pix2intptr_nob(ptab, pix)) { + ld = (Uint64) next; data = ERTS_PTAB_LastData2EtermData(ld); if (ptab->r.o.invalid_data == data) { ld += ptab->r.o.max; ASSERT(erts_ptab_data2pix(ptab, data) == erts_ptab_data2pix(ptab, ERTS_PTAB_LastData2EtermData(ld))); + } + last_data_set_relb(ptab, ld); + } + + while (1) { + int pix; + ld++; + pix = (int) (ld % ptab->r.o.max); + if (first_pix < 0) + first_pix = pix; + else if (pix == first_pix) { + res = -1; + break; + } + if (ERTS_AINT_NULL == erts_ptab_pix2intptr_nob(ptab, pix)) { data = ERTS_PTAB_LastData2EtermData(ld); + if (ptab->r.o.invalid_data == data) { + ld += ptab->r.o.max; + ASSERT(erts_ptab_data2pix(ptab, data) + == erts_ptab_data2pix(ptab, + ERTS_PTAB_LastData2EtermData(ld))); + data = ERTS_PTAB_LastData2EtermData(ld); + } + res = data; + break; } - res = data; - break; } } + assert_ptab_consistency(ptab); erts_ptab_rwunlock(ptab); return res; |