a442d9b895
1. add tcache_max and nhbins into tcache_t so that they are per-tcache, with one auto tcache per thread, it's also per-thread; 2. add mallctl for each thread to set its own tcache_max (of its auto tcache); 3. store the maximum number of items in each bin instead of using a global storage; 4. add tests for the modifications above. 5. Rename `nhbins` and `tcache_maxclass` to `global_do_not_change_nhbins` and `global_do_not_change_tcache_maxclass`.
260 lines
7.3 KiB
C
260 lines
7.3 KiB
C
#ifndef JEMALLOC_INTERNAL_TCACHE_INLINES_H
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#define JEMALLOC_INTERNAL_TCACHE_INLINES_H
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#include "jemalloc/internal/jemalloc_preamble.h"
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#include "jemalloc/internal/arena_externs.h"
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#include "jemalloc/internal/bin.h"
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#include "jemalloc/internal/jemalloc_internal_inlines_b.h"
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#include "jemalloc/internal/jemalloc_internal_types.h"
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#include "jemalloc/internal/large_externs.h"
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#include "jemalloc/internal/san.h"
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#include "jemalloc/internal/sc.h"
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#include "jemalloc/internal/sz.h"
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#include "jemalloc/internal/tcache_externs.h"
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#include "jemalloc/internal/util.h"
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static inline bool
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tcache_enabled_get(tsd_t *tsd) {
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return tsd_tcache_enabled_get(tsd);
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}
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static inline void
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tcache_enabled_set(tsd_t *tsd, bool enabled) {
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bool was_enabled = tsd_tcache_enabled_get(tsd);
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if (!was_enabled && enabled) {
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tsd_tcache_data_init(tsd, NULL);
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} else if (was_enabled && !enabled) {
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tcache_cleanup(tsd);
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}
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/* Commit the state last. Above calls check current state. */
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tsd_tcache_enabled_set(tsd, enabled);
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tsd_slow_update(tsd);
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}
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static inline unsigned
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tcache_nhbins_get(tcache_t *tcache) {
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assert(tcache != NULL);
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assert(tcache->tcache_nhbins <= TCACHE_NBINS_MAX);
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return tcache->tcache_nhbins;
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}
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static inline size_t
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tcache_max_get(tcache_t *tcache) {
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assert(tcache != NULL);
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assert(tcache->tcache_max <= TCACHE_MAXCLASS_LIMIT);
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return tcache->tcache_max;
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}
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static inline void
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tcache_max_and_nhbins_set(tcache_t *tcache, size_t tcache_max) {
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assert(tcache != NULL);
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assert(tcache_max <= TCACHE_MAXCLASS_LIMIT);
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tcache->tcache_max = tcache_max;
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tcache->tcache_nhbins = sz_size2index(tcache_max) + 1;
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}
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static inline void
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thread_tcache_max_and_nhbins_set(tsd_t *tsd, size_t tcache_max) {
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assert(tcache_max <= TCACHE_MAXCLASS_LIMIT);
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assert(tcache_max == sz_s2u(tcache_max));
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tcache_t *tcache = tsd_tcachep_get(tsd);
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tcache_slow_t *tcache_slow;
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assert(tcache != NULL);
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bool enabled = tcache_available(tsd);
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arena_t *assigned_arena;
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if (enabled) {
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tcache_slow = tcache_slow_get(tsd);
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assert(tcache != NULL && tcache_slow != NULL);
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assigned_arena = tcache_slow->arena;
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/* Shutdown and reboot the tcache for a clean slate. */
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tcache_cleanup(tsd);
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}
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/*
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* Still set tcache_max and tcache_nhbins of the tcache even if
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* the tcache is not available yet because the values are
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* stored in tsd_t and are always available for changing.
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*/
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tcache_max_and_nhbins_set(tcache, tcache_max);
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if (enabled) {
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tsd_tcache_data_init(tsd, assigned_arena);
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}
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assert(tcache_nhbins_get(tcache) == sz_size2index(tcache_max) + 1);
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}
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JEMALLOC_ALWAYS_INLINE bool
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tcache_small_bin_disabled(szind_t ind, cache_bin_t *bin) {
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assert(ind < SC_NBINS);
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assert(bin != NULL);
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bool ret = cache_bin_info_ncached_max(&bin->bin_info) == 0;
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if (ret) {
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/* small size class but cache bin disabled. */
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assert((uintptr_t)(*bin->stack_head) ==
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cache_bin_preceding_junk);
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}
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return ret;
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}
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JEMALLOC_ALWAYS_INLINE bool
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tcache_large_bin_disabled(szind_t ind, cache_bin_t *bin) {
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assert(ind >= SC_NBINS);
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assert(bin != NULL);
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return (cache_bin_info_ncached_max(&bin->bin_info) == 0 ||
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cache_bin_still_zero_initialized(bin));
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}
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JEMALLOC_ALWAYS_INLINE void *
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tcache_alloc_small(tsd_t *tsd, arena_t *arena, tcache_t *tcache,
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size_t size, szind_t binind, bool zero, bool slow_path) {
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void *ret;
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bool tcache_success;
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assert(binind < SC_NBINS);
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cache_bin_t *bin = &tcache->bins[binind];
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ret = cache_bin_alloc(bin, &tcache_success);
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assert(tcache_success == (ret != NULL));
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if (unlikely(!tcache_success)) {
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bool tcache_hard_success;
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arena = arena_choose(tsd, arena);
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if (unlikely(arena == NULL)) {
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return NULL;
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}
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if (unlikely(tcache_small_bin_disabled(binind, bin))) {
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/* stats and zero are handled directly by the arena. */
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return arena_malloc_hard(tsd_tsdn(tsd), arena, size,
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binind, zero, /* slab */ true);
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}
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tcache_bin_flush_stashed(tsd, tcache, bin, binind,
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/* is_small */ true);
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ret = tcache_alloc_small_hard(tsd_tsdn(tsd), arena, tcache,
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bin, binind, &tcache_hard_success);
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if (tcache_hard_success == false) {
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return NULL;
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}
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}
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assert(ret);
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if (unlikely(zero)) {
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size_t usize = sz_index2size(binind);
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assert(tcache_salloc(tsd_tsdn(tsd), ret) == usize);
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memset(ret, 0, usize);
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}
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if (config_stats) {
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bin->tstats.nrequests++;
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}
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return ret;
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}
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JEMALLOC_ALWAYS_INLINE void *
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tcache_alloc_large(tsd_t *tsd, arena_t *arena, tcache_t *tcache, size_t size,
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szind_t binind, bool zero, bool slow_path) {
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void *ret;
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bool tcache_success;
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assert(binind >= SC_NBINS && binind < tcache_nhbins_get(tcache));
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cache_bin_t *bin = &tcache->bins[binind];
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ret = cache_bin_alloc(bin, &tcache_success);
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assert(tcache_success == (ret != NULL));
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if (unlikely(!tcache_success)) {
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/*
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* Only allocate one large object at a time, because it's quite
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* expensive to create one and not use it.
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*/
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arena = arena_choose(tsd, arena);
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if (unlikely(arena == NULL)) {
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return NULL;
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}
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tcache_bin_flush_stashed(tsd, tcache, bin, binind,
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/* is_small */ false);
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ret = large_malloc(tsd_tsdn(tsd), arena, sz_s2u(size), zero);
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if (ret == NULL) {
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return NULL;
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}
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} else {
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if (unlikely(zero)) {
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size_t usize = sz_index2size(binind);
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assert(usize <= tcache_max_get(tcache));
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memset(ret, 0, usize);
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}
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if (config_stats) {
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bin->tstats.nrequests++;
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}
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}
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return ret;
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}
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JEMALLOC_ALWAYS_INLINE void
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tcache_dalloc_small(tsd_t *tsd, tcache_t *tcache, void *ptr, szind_t binind,
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bool slow_path) {
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assert(tcache_salloc(tsd_tsdn(tsd), ptr) <= SC_SMALL_MAXCLASS);
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cache_bin_t *bin = &tcache->bins[binind];
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/*
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* Not marking the branch unlikely because this is past free_fastpath()
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* (which handles the most common cases), i.e. at this point it's often
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* uncommon cases.
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*/
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if (cache_bin_nonfast_aligned(ptr)) {
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/* Junk unconditionally, even if bin is full. */
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san_junk_ptr(ptr, sz_index2size(binind));
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if (cache_bin_stash(bin, ptr)) {
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return;
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}
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assert(cache_bin_full(bin));
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/* Bin full; fall through into the flush branch. */
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}
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if (unlikely(!cache_bin_dalloc_easy(bin, ptr))) {
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if (unlikely(tcache_small_bin_disabled(binind, bin))) {
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arena_dalloc_small(tsd_tsdn(tsd), ptr);
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return;
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}
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cache_bin_sz_t max = cache_bin_info_ncached_max(
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&bin->bin_info);
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unsigned remain = max >> opt_lg_tcache_flush_small_div;
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tcache_bin_flush_small(tsd, tcache, bin, binind, remain);
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bool ret = cache_bin_dalloc_easy(bin, ptr);
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assert(ret);
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}
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}
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JEMALLOC_ALWAYS_INLINE void
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tcache_dalloc_large(tsd_t *tsd, tcache_t *tcache, void *ptr, szind_t binind,
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bool slow_path) {
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assert(tcache_salloc(tsd_tsdn(tsd), ptr) > SC_SMALL_MAXCLASS);
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assert(tcache_salloc(tsd_tsdn(tsd), ptr) <= tcache_max_get(tcache));
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cache_bin_t *bin = &tcache->bins[binind];
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if (unlikely(!cache_bin_dalloc_easy(bin, ptr))) {
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unsigned remain = cache_bin_info_ncached_max(
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&bin->bin_info) >> opt_lg_tcache_flush_large_div;
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tcache_bin_flush_large(tsd, tcache, bin, binind, remain);
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bool ret = cache_bin_dalloc_easy(bin, ptr);
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assert(ret);
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}
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}
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JEMALLOC_ALWAYS_INLINE tcache_t *
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tcaches_get(tsd_t *tsd, unsigned ind) {
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tcaches_t *elm = &tcaches[ind];
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if (unlikely(elm->tcache == NULL)) {
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malloc_printf("<jemalloc>: invalid tcache id (%u).\n", ind);
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abort();
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} else if (unlikely(elm->tcache == TCACHES_ELM_NEED_REINIT)) {
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elm->tcache = tcache_create_explicit(tsd);
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}
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return elm->tcache;
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}
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#endif /* JEMALLOC_INTERNAL_TCACHE_INLINES_H */
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