mirror of
https://github.com/jemalloc/jemalloc.git
synced 2026-04-18 08:31:46 +03:00
ee41ad409a
Extend per arena unused dirty page purging to manage unused dirty chunks in aaddtion to unused dirty runs. Rather than immediately unmapping deallocated chunks (or purging them in the --disable-munmap case), store them in a separate set of trees, chunks_[sz]ad_dirty. Preferrentially allocate dirty chunks. When excessive unused dirty pages accumulate, purge runs and chunks in ingegrated LRU order (and unmap chunks in the --enable-munmap case). Refactor extent_node_t to provide accessor functions.
533 lines
13 KiB
C
533 lines
13 KiB
C
#define JEMALLOC_TCACHE_C_
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#include "jemalloc/internal/jemalloc_internal.h"
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/******************************************************************************/
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/* Data. */
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bool opt_tcache = true;
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ssize_t opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT;
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tcache_bin_info_t *tcache_bin_info;
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static unsigned stack_nelms; /* Total stack elms per tcache. */
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size_t nhbins;
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size_t tcache_maxclass;
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tcaches_t *tcaches;
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/* Index of first element within tcaches that has never been used. */
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static unsigned tcaches_past;
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/* Head of singly linked list tracking available tcaches elements. */
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static tcaches_t *tcaches_avail;
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/******************************************************************************/
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size_t tcache_salloc(const void *ptr)
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{
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return (arena_salloc(ptr, false));
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}
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void
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tcache_event_hard(tsd_t *tsd, tcache_t *tcache)
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{
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index_t binind = tcache->next_gc_bin;
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tcache_bin_t *tbin = &tcache->tbins[binind];
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tcache_bin_info_t *tbin_info = &tcache_bin_info[binind];
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if (tbin->low_water > 0) {
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/*
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* Flush (ceiling) 3/4 of the objects below the low water mark.
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*/
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if (binind < NBINS) {
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tcache_bin_flush_small(tsd, tcache, tbin, binind,
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tbin->ncached - tbin->low_water + (tbin->low_water
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>> 2));
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} else {
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tcache_bin_flush_large(tsd, tbin, binind, tbin->ncached
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- tbin->low_water + (tbin->low_water >> 2), tcache);
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}
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/*
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* Reduce fill count by 2X. Limit lg_fill_div such that the
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* fill count is always at least 1.
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*/
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if ((tbin_info->ncached_max >> (tbin->lg_fill_div+1)) >= 1)
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tbin->lg_fill_div++;
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} else if (tbin->low_water < 0) {
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/*
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* Increase fill count by 2X. Make sure lg_fill_div stays
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* greater than 0.
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*/
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if (tbin->lg_fill_div > 1)
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tbin->lg_fill_div--;
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}
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tbin->low_water = tbin->ncached;
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tcache->next_gc_bin++;
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if (tcache->next_gc_bin == nhbins)
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tcache->next_gc_bin = 0;
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tcache->ev_cnt = 0;
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}
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void *
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tcache_alloc_small_hard(tsd_t *tsd, arena_t *arena, tcache_t *tcache,
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tcache_bin_t *tbin, index_t binind)
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{
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void *ret;
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arena_tcache_fill_small(arena, tbin, binind, config_prof ?
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tcache->prof_accumbytes : 0);
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if (config_prof)
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tcache->prof_accumbytes = 0;
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ret = tcache_alloc_easy(tbin);
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return (ret);
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}
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void
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tcache_bin_flush_small(tsd_t *tsd, tcache_t *tcache, tcache_bin_t *tbin,
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index_t binind, unsigned rem)
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{
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arena_t *arena;
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void *ptr;
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unsigned i, nflush, ndeferred;
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bool merged_stats = false;
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assert(binind < NBINS);
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assert(rem <= tbin->ncached);
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arena = arena_choose(tsd, NULL);
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assert(arena != NULL);
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for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
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/* Lock the arena bin associated with the first object. */
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arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
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tbin->avail[0]);
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arena_t *bin_arena = extent_node_arena_get(&chunk->node);
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arena_bin_t *bin = &bin_arena->bins[binind];
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if (config_prof && bin_arena == arena) {
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if (arena_prof_accum(arena, tcache->prof_accumbytes))
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prof_idump();
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tcache->prof_accumbytes = 0;
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}
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malloc_mutex_lock(&bin->lock);
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if (config_stats && bin_arena == arena) {
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assert(!merged_stats);
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merged_stats = true;
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bin->stats.nflushes++;
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bin->stats.nrequests += tbin->tstats.nrequests;
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tbin->tstats.nrequests = 0;
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}
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ndeferred = 0;
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for (i = 0; i < nflush; i++) {
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ptr = tbin->avail[i];
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assert(ptr != NULL);
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chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
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if (extent_node_arena_get(&chunk->node) == bin_arena) {
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size_t pageind = ((uintptr_t)ptr -
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(uintptr_t)chunk) >> LG_PAGE;
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arena_chunk_map_bits_t *bitselm =
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arena_bitselm_get(chunk, pageind);
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arena_dalloc_bin_junked_locked(bin_arena, chunk,
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ptr, bitselm);
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} else {
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/*
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* This object was allocated via a different
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* arena bin than the one that is currently
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* locked. Stash the object, so that it can be
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* handled in a future pass.
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*/
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tbin->avail[ndeferred] = ptr;
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ndeferred++;
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}
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}
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malloc_mutex_unlock(&bin->lock);
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}
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if (config_stats && !merged_stats) {
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/*
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* The flush loop didn't happen to flush to this thread's
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* arena, so the stats didn't get merged. Manually do so now.
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*/
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arena_bin_t *bin = &arena->bins[binind];
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malloc_mutex_lock(&bin->lock);
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bin->stats.nflushes++;
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bin->stats.nrequests += tbin->tstats.nrequests;
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tbin->tstats.nrequests = 0;
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malloc_mutex_unlock(&bin->lock);
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}
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memmove(tbin->avail, &tbin->avail[tbin->ncached - rem],
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rem * sizeof(void *));
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tbin->ncached = rem;
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if ((int)tbin->ncached < tbin->low_water)
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tbin->low_water = tbin->ncached;
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}
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void
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tcache_bin_flush_large(tsd_t *tsd, tcache_bin_t *tbin, index_t binind,
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unsigned rem, tcache_t *tcache)
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{
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arena_t *arena;
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void *ptr;
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unsigned i, nflush, ndeferred;
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bool merged_stats = false;
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assert(binind < nhbins);
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assert(rem <= tbin->ncached);
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arena = arena_choose(tsd, NULL);
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assert(arena != NULL);
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for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
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/* Lock the arena associated with the first object. */
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arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
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tbin->avail[0]);
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arena_t *locked_arena = extent_node_arena_get(&chunk->node);
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UNUSED bool idump;
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if (config_prof)
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idump = false;
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malloc_mutex_lock(&locked_arena->lock);
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if ((config_prof || config_stats) && locked_arena == arena) {
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if (config_prof) {
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idump = arena_prof_accum_locked(arena,
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tcache->prof_accumbytes);
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tcache->prof_accumbytes = 0;
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}
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if (config_stats) {
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merged_stats = true;
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arena->stats.nrequests_large +=
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tbin->tstats.nrequests;
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arena->stats.lstats[binind - NBINS].nrequests +=
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tbin->tstats.nrequests;
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tbin->tstats.nrequests = 0;
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}
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}
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ndeferred = 0;
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for (i = 0; i < nflush; i++) {
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ptr = tbin->avail[i];
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assert(ptr != NULL);
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chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
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if (extent_node_arena_get(&chunk->node) ==
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locked_arena) {
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arena_dalloc_large_junked_locked(locked_arena,
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chunk, ptr);
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} else {
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/*
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* This object was allocated via a different
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* arena than the one that is currently locked.
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* Stash the object, so that it can be handled
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* in a future pass.
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*/
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tbin->avail[ndeferred] = ptr;
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ndeferred++;
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}
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}
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malloc_mutex_unlock(&locked_arena->lock);
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if (config_prof && idump)
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prof_idump();
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}
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if (config_stats && !merged_stats) {
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/*
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* The flush loop didn't happen to flush to this thread's
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* arena, so the stats didn't get merged. Manually do so now.
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*/
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malloc_mutex_lock(&arena->lock);
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arena->stats.nrequests_large += tbin->tstats.nrequests;
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arena->stats.lstats[binind - NBINS].nrequests +=
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tbin->tstats.nrequests;
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tbin->tstats.nrequests = 0;
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malloc_mutex_unlock(&arena->lock);
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}
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memmove(tbin->avail, &tbin->avail[tbin->ncached - rem],
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rem * sizeof(void *));
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tbin->ncached = rem;
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if ((int)tbin->ncached < tbin->low_water)
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tbin->low_water = tbin->ncached;
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}
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void
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tcache_arena_associate(tcache_t *tcache, arena_t *arena)
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{
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if (config_stats) {
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/* Link into list of extant tcaches. */
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malloc_mutex_lock(&arena->lock);
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ql_elm_new(tcache, link);
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ql_tail_insert(&arena->tcache_ql, tcache, link);
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malloc_mutex_unlock(&arena->lock);
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}
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}
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void
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tcache_arena_reassociate(tcache_t *tcache, arena_t *oldarena, arena_t *newarena)
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{
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tcache_arena_dissociate(tcache, oldarena);
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tcache_arena_associate(tcache, newarena);
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}
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void
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tcache_arena_dissociate(tcache_t *tcache, arena_t *arena)
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{
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if (config_stats) {
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/* Unlink from list of extant tcaches. */
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malloc_mutex_lock(&arena->lock);
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if (config_debug) {
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bool in_ql = false;
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tcache_t *iter;
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ql_foreach(iter, &arena->tcache_ql, link) {
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if (iter == tcache) {
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in_ql = true;
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break;
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}
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}
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assert(in_ql);
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}
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ql_remove(&arena->tcache_ql, tcache, link);
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tcache_stats_merge(tcache, arena);
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malloc_mutex_unlock(&arena->lock);
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}
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}
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tcache_t *
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tcache_get_hard(tsd_t *tsd)
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{
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arena_t *arena;
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if (!tcache_enabled_get()) {
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if (tsd_nominal(tsd))
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tcache_enabled_set(false); /* Memoize. */
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return (NULL);
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}
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arena = arena_choose(tsd, NULL);
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if (unlikely(arena == NULL))
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return (NULL);
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return (tcache_create(tsd, arena));
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}
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tcache_t *
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tcache_create(tsd_t *tsd, arena_t *arena)
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{
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tcache_t *tcache;
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size_t size, stack_offset;
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unsigned i;
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size = offsetof(tcache_t, tbins) + (sizeof(tcache_bin_t) * nhbins);
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/* Naturally align the pointer stacks. */
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size = PTR_CEILING(size);
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stack_offset = size;
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size += stack_nelms * sizeof(void *);
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/* Avoid false cacheline sharing. */
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size = sa2u(size, CACHELINE);
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tcache = ipallocztm(tsd, size, CACHELINE, true, false, true, a0get());
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if (tcache == NULL)
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return (NULL);
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tcache_arena_associate(tcache, arena);
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assert((TCACHE_NSLOTS_SMALL_MAX & 1U) == 0);
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for (i = 0; i < nhbins; i++) {
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tcache->tbins[i].lg_fill_div = 1;
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tcache->tbins[i].avail = (void **)((uintptr_t)tcache +
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(uintptr_t)stack_offset);
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stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *);
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}
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return (tcache);
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}
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static void
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tcache_destroy(tsd_t *tsd, tcache_t *tcache)
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{
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arena_t *arena;
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unsigned i;
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arena = arena_choose(tsd, NULL);
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tcache_arena_dissociate(tcache, arena);
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for (i = 0; i < NBINS; i++) {
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tcache_bin_t *tbin = &tcache->tbins[i];
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tcache_bin_flush_small(tsd, tcache, tbin, i, 0);
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if (config_stats && tbin->tstats.nrequests != 0) {
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arena_bin_t *bin = &arena->bins[i];
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malloc_mutex_lock(&bin->lock);
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bin->stats.nrequests += tbin->tstats.nrequests;
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malloc_mutex_unlock(&bin->lock);
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}
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}
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for (; i < nhbins; i++) {
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tcache_bin_t *tbin = &tcache->tbins[i];
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tcache_bin_flush_large(tsd, tbin, i, 0, tcache);
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if (config_stats && tbin->tstats.nrequests != 0) {
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malloc_mutex_lock(&arena->lock);
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arena->stats.nrequests_large += tbin->tstats.nrequests;
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arena->stats.lstats[i - NBINS].nrequests +=
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tbin->tstats.nrequests;
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malloc_mutex_unlock(&arena->lock);
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}
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}
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if (config_prof && tcache->prof_accumbytes > 0 &&
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arena_prof_accum(arena, tcache->prof_accumbytes))
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prof_idump();
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idalloctm(tsd, tcache, false, true);
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}
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void
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tcache_cleanup(tsd_t *tsd)
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{
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tcache_t *tcache;
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if (!config_tcache)
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return;
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if ((tcache = tsd_tcache_get(tsd)) != NULL) {
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tcache_destroy(tsd, tcache);
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tsd_tcache_set(tsd, NULL);
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}
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}
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void
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tcache_enabled_cleanup(tsd_t *tsd)
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{
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/* Do nothing. */
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}
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/* Caller must own arena->lock. */
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void
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tcache_stats_merge(tcache_t *tcache, arena_t *arena)
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{
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unsigned i;
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cassert(config_stats);
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/* Merge and reset tcache stats. */
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for (i = 0; i < NBINS; i++) {
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arena_bin_t *bin = &arena->bins[i];
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tcache_bin_t *tbin = &tcache->tbins[i];
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malloc_mutex_lock(&bin->lock);
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bin->stats.nrequests += tbin->tstats.nrequests;
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malloc_mutex_unlock(&bin->lock);
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tbin->tstats.nrequests = 0;
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}
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for (; i < nhbins; i++) {
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malloc_large_stats_t *lstats = &arena->stats.lstats[i - NBINS];
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tcache_bin_t *tbin = &tcache->tbins[i];
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arena->stats.nrequests_large += tbin->tstats.nrequests;
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lstats->nrequests += tbin->tstats.nrequests;
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tbin->tstats.nrequests = 0;
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}
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}
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bool
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tcaches_create(tsd_t *tsd, unsigned *r_ind)
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{
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tcache_t *tcache;
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tcaches_t *elm;
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if (tcaches == NULL) {
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tcaches = base_alloc(sizeof(tcache_t *) *
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(MALLOCX_TCACHE_MAX+1));
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if (tcaches == NULL)
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return (true);
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}
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if (tcaches_avail == NULL && tcaches_past > MALLOCX_TCACHE_MAX)
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return (true);
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tcache = tcache_create(tsd, a0get());
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if (tcache == NULL)
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return (true);
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if (tcaches_avail != NULL) {
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elm = tcaches_avail;
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tcaches_avail = tcaches_avail->next;
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elm->tcache = tcache;
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*r_ind = elm - tcaches;
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} else {
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elm = &tcaches[tcaches_past];
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elm->tcache = tcache;
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*r_ind = tcaches_past;
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tcaches_past++;
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}
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return (false);
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}
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static void
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tcaches_elm_flush(tsd_t *tsd, tcaches_t *elm)
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{
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if (elm->tcache == NULL)
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return;
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tcache_destroy(tsd, elm->tcache);
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elm->tcache = NULL;
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}
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void
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tcaches_flush(tsd_t *tsd, unsigned ind)
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{
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tcaches_elm_flush(tsd, &tcaches[ind]);
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}
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void
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tcaches_destroy(tsd_t *tsd, unsigned ind)
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{
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tcaches_t *elm = &tcaches[ind];
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tcaches_elm_flush(tsd, elm);
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elm->next = tcaches_avail;
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tcaches_avail = elm;
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}
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bool
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tcache_boot(void)
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{
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unsigned i;
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/*
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* If necessary, clamp opt_lg_tcache_max, now that arena_maxclass is
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* known.
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*/
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if (opt_lg_tcache_max < 0 || (1U << opt_lg_tcache_max) < SMALL_MAXCLASS)
|
|
tcache_maxclass = SMALL_MAXCLASS;
|
|
else if ((1U << opt_lg_tcache_max) > arena_maxclass)
|
|
tcache_maxclass = arena_maxclass;
|
|
else
|
|
tcache_maxclass = (1U << opt_lg_tcache_max);
|
|
|
|
nhbins = NBINS + (tcache_maxclass >> LG_PAGE);
|
|
|
|
/* Initialize tcache_bin_info. */
|
|
tcache_bin_info = (tcache_bin_info_t *)base_alloc(nhbins *
|
|
sizeof(tcache_bin_info_t));
|
|
if (tcache_bin_info == NULL)
|
|
return (true);
|
|
stack_nelms = 0;
|
|
for (i = 0; i < NBINS; i++) {
|
|
if ((arena_bin_info[i].nregs << 1) <= TCACHE_NSLOTS_SMALL_MAX) {
|
|
tcache_bin_info[i].ncached_max =
|
|
(arena_bin_info[i].nregs << 1);
|
|
} else {
|
|
tcache_bin_info[i].ncached_max =
|
|
TCACHE_NSLOTS_SMALL_MAX;
|
|
}
|
|
stack_nelms += tcache_bin_info[i].ncached_max;
|
|
}
|
|
for (; i < nhbins; i++) {
|
|
tcache_bin_info[i].ncached_max = TCACHE_NSLOTS_LARGE;
|
|
stack_nelms += tcache_bin_info[i].ncached_max;
|
|
}
|
|
|
|
return (false);
|
|
}
|