392 lines
10 KiB
C
392 lines
10 KiB
C
/******************************************************************************/
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#ifdef JEMALLOC_H_TYPES
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typedef struct tcache_bin_info_s tcache_bin_info_t;
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typedef struct tcache_bin_s tcache_bin_t;
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typedef struct tcache_s tcache_t;
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/*
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* Absolute maximum number of cache slots for each small bin in the thread
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* cache. This is an additional constraint beyond that imposed as: twice the
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* number of regions per run for this size class.
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*
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* This constant must be an even number.
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*/
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#define TCACHE_NSLOTS_SMALL_MAX 200
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/* Number of cache slots for large size classes. */
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#define TCACHE_NSLOTS_LARGE 20
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/* (1U << opt_lg_tcache_max) is used to compute tcache_maxclass. */
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#define LG_TCACHE_MAXCLASS_DEFAULT 15
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/*
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* (1U << opt_lg_tcache_gc_sweep) is the approximate number of allocation
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* events between full GC sweeps (-1: disabled). Integer rounding may cause
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* the actual number to be slightly higher, since GC is performed
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* incrementally.
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*/
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#define LG_TCACHE_GC_SWEEP_DEFAULT 13
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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/*
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* Read-only information associated with each element of tcache_t's tbins array
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* is stored separately, mainly to reduce memory usage.
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*/
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struct tcache_bin_info_s {
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unsigned ncached_max; /* Upper limit on ncached. */
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};
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struct tcache_bin_s {
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tcache_bin_stats_t tstats;
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int low_water; /* Min # cached since last GC. */
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unsigned lg_fill_div; /* Fill (ncached_max >> lg_fill_div). */
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unsigned ncached; /* # of cached objects. */
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void **avail; /* Stack of available objects. */
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};
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struct tcache_s {
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ql_elm(tcache_t) link; /* Used for aggregating stats. */
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uint64_t prof_accumbytes;/* Cleared after arena_prof_accum() */
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arena_t *arena; /* This thread's arena. */
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unsigned ev_cnt; /* Event count since incremental GC. */
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unsigned next_gc_bin; /* Next bin to GC. */
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tcache_bin_t tbins[1]; /* Dynamically sized. */
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/*
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* The pointer stacks associated with tbins follow as a contiguous
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* array. During tcache initialization, the avail pointer in each
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* element of tbins is initialized to point to the proper offset within
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* this array.
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*/
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};
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#endif /* JEMALLOC_H_STRUCTS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_EXTERNS
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extern bool opt_tcache;
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extern ssize_t opt_lg_tcache_max;
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extern ssize_t opt_lg_tcache_gc_sweep;
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extern tcache_bin_info_t *tcache_bin_info;
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/* Map of thread-specific caches. */
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#ifndef NO_TLS
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extern __thread tcache_t *tcache_tls
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JEMALLOC_ATTR(tls_model("initial-exec"));
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# define TCACHE_GET() tcache_tls
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# define TCACHE_SET(v) do { \
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tcache_tls = (tcache_t *)(v); \
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pthread_setspecific(tcache_tsd, (void *)(v)); \
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} while (0)
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#else
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# define TCACHE_GET() ((tcache_t *)pthread_getspecific(tcache_tsd))
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# define TCACHE_SET(v) do { \
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pthread_setspecific(tcache_tsd, (void *)(v)); \
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} while (0)
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#endif
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extern pthread_key_t tcache_tsd;
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/*
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* Number of tcache bins. There are NBINS small-object bins, plus 0 or more
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* large-object bins.
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*/
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extern size_t nhbins;
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/* Maximum cached size class. */
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extern size_t tcache_maxclass;
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/* Number of tcache allocation/deallocation events between incremental GCs. */
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extern unsigned tcache_gc_incr;
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void tcache_bin_flush_small(tcache_bin_t *tbin, size_t binind, unsigned rem,
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tcache_t *tcache);
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void tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem,
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tcache_t *tcache);
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tcache_t *tcache_create(arena_t *arena);
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void *tcache_alloc_small_hard(tcache_t *tcache, tcache_bin_t *tbin,
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size_t binind);
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void tcache_destroy(tcache_t *tcache);
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void tcache_stats_merge(tcache_t *tcache, arena_t *arena);
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bool tcache_boot(void);
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#endif /* JEMALLOC_H_EXTERNS */
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/******************************************************************************/
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#ifdef JEMALLOC_H_INLINES
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#ifndef JEMALLOC_ENABLE_INLINE
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void tcache_event(tcache_t *tcache);
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tcache_t *tcache_get(void);
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void *tcache_alloc_easy(tcache_bin_t *tbin);
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void *tcache_alloc_small(tcache_t *tcache, size_t size, bool zero);
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void *tcache_alloc_large(tcache_t *tcache, size_t size, bool zero);
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void tcache_dalloc_small(tcache_t *tcache, void *ptr);
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void tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size);
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#endif
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#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_TCACHE_C_))
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JEMALLOC_INLINE tcache_t *
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tcache_get(void)
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{
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tcache_t *tcache;
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if (config_tcache == false)
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return (NULL);
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if (config_lazy_lock && (isthreaded & opt_tcache) == false)
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return (NULL);
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else if (opt_tcache == false)
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return (NULL);
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tcache = TCACHE_GET();
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if ((uintptr_t)tcache <= (uintptr_t)2) {
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if (tcache == NULL) {
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tcache = tcache_create(choose_arena());
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if (tcache == NULL)
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return (NULL);
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} else {
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if (tcache == (void *)(uintptr_t)1) {
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/*
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* Make a note that an allocator function was
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* called after the tcache_thread_cleanup() was
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* called.
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*/
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TCACHE_SET((uintptr_t)2);
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}
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return (NULL);
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}
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}
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return (tcache);
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}
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JEMALLOC_INLINE void
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tcache_event(tcache_t *tcache)
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{
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if (tcache_gc_incr == 0)
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return;
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tcache->ev_cnt++;
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assert(tcache->ev_cnt <= tcache_gc_incr);
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if (tcache->ev_cnt == tcache_gc_incr) {
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size_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
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* water mark.
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*/
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if (binind < NBINS) {
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tcache_bin_flush_small(tbin, binind,
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tbin->ncached - tbin->low_water +
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(tbin->low_water >> 2), tcache);
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} else {
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tcache_bin_flush_large(tbin, binind,
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tbin->ncached - tbin->low_water +
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(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
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* the 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))
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>= 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
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* stays 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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}
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JEMALLOC_INLINE void *
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tcache_alloc_easy(tcache_bin_t *tbin)
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{
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void *ret;
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if (tbin->ncached == 0) {
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tbin->low_water = -1;
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return (NULL);
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}
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tbin->ncached--;
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if ((int)tbin->ncached < tbin->low_water)
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tbin->low_water = tbin->ncached;
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ret = tbin->avail[tbin->ncached];
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return (ret);
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}
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JEMALLOC_INLINE void *
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tcache_alloc_small(tcache_t *tcache, size_t size, bool zero)
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{
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void *ret;
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size_t binind;
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tcache_bin_t *tbin;
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binind = SMALL_SIZE2BIN(size);
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assert(binind < NBINS);
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tbin = &tcache->tbins[binind];
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ret = tcache_alloc_easy(tbin);
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if (ret == NULL) {
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ret = tcache_alloc_small_hard(tcache, tbin, binind);
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if (ret == NULL)
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return (NULL);
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}
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assert(arena_salloc(ret) == arena_bin_info[binind].reg_size);
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if (zero == false) {
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if (config_fill) {
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if (opt_junk)
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memset(ret, 0xa5, size);
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else if (opt_zero)
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memset(ret, 0, size);
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}
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} else
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memset(ret, 0, size);
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if (config_stats)
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tbin->tstats.nrequests++;
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if (config_prof)
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tcache->prof_accumbytes += arena_bin_info[binind].reg_size;
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tcache_event(tcache);
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return (ret);
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}
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JEMALLOC_INLINE void *
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tcache_alloc_large(tcache_t *tcache, size_t size, bool zero)
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{
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void *ret;
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size_t binind;
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tcache_bin_t *tbin;
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size = PAGE_CEILING(size);
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assert(size <= tcache_maxclass);
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binind = NBINS + (size >> PAGE_SHIFT) - 1;
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assert(binind < nhbins);
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tbin = &tcache->tbins[binind];
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ret = tcache_alloc_easy(tbin);
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if (ret == NULL) {
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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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ret = arena_malloc_large(tcache->arena, size, zero);
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if (ret == NULL)
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return (NULL);
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} else {
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if (config_prof) {
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arena_chunk_t *chunk =
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(arena_chunk_t *)CHUNK_ADDR2BASE(ret);
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size_t pageind = (((uintptr_t)ret - (uintptr_t)chunk) >>
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PAGE_SHIFT);
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chunk->map[pageind-map_bias].bits &=
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~CHUNK_MAP_CLASS_MASK;
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}
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if (zero == false) {
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if (config_fill) {
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if (opt_junk)
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memset(ret, 0xa5, size);
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else if (opt_zero)
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memset(ret, 0, size);
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}
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} else
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memset(ret, 0, size);
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if (config_stats)
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tbin->tstats.nrequests++;
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if (config_prof)
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tcache->prof_accumbytes += size;
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}
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tcache_event(tcache);
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return (ret);
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}
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JEMALLOC_INLINE void
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tcache_dalloc_small(tcache_t *tcache, void *ptr)
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{
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arena_t *arena;
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arena_chunk_t *chunk;
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arena_run_t *run;
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arena_bin_t *bin;
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tcache_bin_t *tbin;
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tcache_bin_info_t *tbin_info;
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size_t pageind, binind;
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arena_chunk_map_t *mapelm;
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assert(arena_salloc(ptr) <= SMALL_MAXCLASS);
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chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
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arena = chunk->arena;
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pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT;
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mapelm = &chunk->map[pageind-map_bias];
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run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
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(mapelm->bits >> PAGE_SHIFT)) << PAGE_SHIFT));
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bin = run->bin;
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binind = ((uintptr_t)bin - (uintptr_t)&arena->bins) /
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sizeof(arena_bin_t);
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assert(binind < NBINS);
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if (config_fill && opt_junk)
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memset(ptr, 0x5a, arena_bin_info[binind].reg_size);
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tbin = &tcache->tbins[binind];
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tbin_info = &tcache_bin_info[binind];
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if (tbin->ncached == tbin_info->ncached_max) {
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tcache_bin_flush_small(tbin, binind, (tbin_info->ncached_max >>
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1), tcache);
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}
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assert(tbin->ncached < tbin_info->ncached_max);
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tbin->avail[tbin->ncached] = ptr;
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tbin->ncached++;
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tcache_event(tcache);
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}
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JEMALLOC_INLINE void
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tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size)
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{
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size_t binind;
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tcache_bin_t *tbin;
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tcache_bin_info_t *tbin_info;
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assert((size & PAGE_MASK) == 0);
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assert(arena_salloc(ptr) > SMALL_MAXCLASS);
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assert(arena_salloc(ptr) <= tcache_maxclass);
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binind = NBINS + (size >> PAGE_SHIFT) - 1;
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if (config_fill && opt_junk)
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memset(ptr, 0x5a, size);
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tbin = &tcache->tbins[binind];
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tbin_info = &tcache_bin_info[binind];
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if (tbin->ncached == tbin_info->ncached_max) {
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tcache_bin_flush_large(tbin, binind, (tbin_info->ncached_max >>
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1), tcache);
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}
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assert(tbin->ncached < tbin_info->ncached_max);
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tbin->avail[tbin->ncached] = ptr;
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tbin->ncached++;
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tcache_event(tcache);
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}
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#endif
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#endif /* JEMALLOC_H_INLINES */
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/******************************************************************************/
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