1cb181ed63
Add the MALLOCX_TCACHE() and MALLOCX_TCACHE_NONE macros, which can be used in conjunction with the *allocx() API. Add the tcache.create, tcache.flush, and tcache.destroy mallctls. This resolves #145.
420 lines
11 KiB
C
420 lines
11 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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typedef struct tcaches_s tcaches_t;
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/*
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* tcache pointers close to NULL are used to encode state information that is
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* used for two purposes: preventing thread caching on a per thread basis and
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* cleaning up during thread shutdown.
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*/
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#define TCACHE_STATE_DISABLED ((tcache_t *)(uintptr_t)1)
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#define TCACHE_STATE_REINCARNATED ((tcache_t *)(uintptr_t)2)
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#define TCACHE_STATE_PURGATORY ((tcache_t *)(uintptr_t)3)
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#define TCACHE_STATE_MAX TCACHE_STATE_PURGATORY
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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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* TCACHE_GC_SWEEP is the approximate number of allocation events between
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* full GC sweeps. Integer rounding may cause the actual number to be
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* slightly higher, since GC is performed incrementally.
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*/
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#define TCACHE_GC_SWEEP 8192
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/* Number of tcache allocation/deallocation events between incremental GCs. */
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#define TCACHE_GC_INCR \
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((TCACHE_GC_SWEEP / NBINS) + ((TCACHE_GC_SWEEP / NBINS == 0) ? 0 : 1))
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#endif /* JEMALLOC_H_TYPES */
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/******************************************************************************/
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#ifdef JEMALLOC_H_STRUCTS
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typedef enum {
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tcache_enabled_false = 0, /* Enable cast to/from bool. */
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tcache_enabled_true = 1,
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tcache_enabled_default = 2
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} tcache_enabled_t;
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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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unsigned ev_cnt; /* Event count since incremental GC. */
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index_t 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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/* Linkage for list of available (previously used) explicit tcache IDs. */
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struct tcaches_s {
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union {
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tcache_t *tcache;
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tcaches_t *next;
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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 tcache_bin_info_t *tcache_bin_info;
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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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/*
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* Explicit tcaches, managed via the tcache.{create,flush,destroy} mallctls and
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* usable via the MALLOCX_TCACHE() flag. The automatic per thread tcaches are
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* completely disjoint from this data structure. tcaches starts off as a sparse
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* array, so it has no physical memory footprint until individual pages are
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* touched. This allows the entire array to be allocated the first time an
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* explicit tcache is created without a disproportionate impact on memory usage.
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*/
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extern tcaches_t *tcaches;
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size_t tcache_salloc(const void *ptr);
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void tcache_event_hard(tsd_t *tsd, tcache_t *tcache);
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void *tcache_alloc_small_hard(tsd_t *tsd, tcache_t *tcache,
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tcache_bin_t *tbin, index_t binind);
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void tcache_bin_flush_small(tsd_t *tsd, tcache_bin_t *tbin, index_t binind,
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unsigned rem, tcache_t *tcache);
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void 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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void tcache_arena_associate(tcache_t *tcache, arena_t *arena);
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void tcache_arena_reassociate(tcache_t *tcache, arena_t *oldarena,
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arena_t *newarena);
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void tcache_arena_dissociate(tcache_t *tcache, arena_t *arena);
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tcache_t *tcache_get_hard(tsd_t *tsd);
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tcache_t *tcache_create(tsd_t *tsd, arena_t *arena);
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void tcache_cleanup(tsd_t *tsd);
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void tcache_enabled_cleanup(tsd_t *tsd);
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void tcache_stats_merge(tcache_t *tcache, arena_t *arena);
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bool tcaches_create(tsd_t *tsd, unsigned *r_ind);
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void tcaches_flush(tsd_t *tsd, unsigned ind);
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void tcaches_destroy(tsd_t *tsd, unsigned ind);
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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(tsd_t *tsd, tcache_t *tcache);
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void tcache_flush(void);
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bool tcache_enabled_get(void);
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tcache_t *tcache_get(tsd_t *tsd, bool create);
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void tcache_enabled_set(bool enabled);
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void *tcache_alloc_easy(tcache_bin_t *tbin);
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void *tcache_alloc_small(tsd_t *tsd, tcache_t *tcache, size_t size,
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bool zero);
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void *tcache_alloc_large(tsd_t *tsd, tcache_t *tcache, size_t size,
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bool zero);
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void tcache_dalloc_small(tsd_t *tsd, tcache_t *tcache, void *ptr,
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index_t binind);
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void tcache_dalloc_large(tsd_t *tsd, tcache_t *tcache, void *ptr,
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size_t size);
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tcache_t *tcaches_get(tsd_t *tsd, unsigned ind);
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#endif
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#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_TCACHE_C_))
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JEMALLOC_INLINE void
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tcache_flush(void)
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{
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tsd_t *tsd;
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cassert(config_tcache);
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tsd = tsd_fetch();
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tcache_cleanup(tsd);
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}
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JEMALLOC_INLINE bool
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tcache_enabled_get(void)
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{
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tsd_t *tsd;
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tcache_enabled_t tcache_enabled;
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cassert(config_tcache);
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tsd = tsd_fetch();
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tcache_enabled = tsd_tcache_enabled_get(tsd);
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if (tcache_enabled == tcache_enabled_default) {
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tcache_enabled = (tcache_enabled_t)opt_tcache;
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tsd_tcache_enabled_set(tsd, tcache_enabled);
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}
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return ((bool)tcache_enabled);
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}
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JEMALLOC_INLINE void
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tcache_enabled_set(bool enabled)
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{
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tsd_t *tsd;
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tcache_enabled_t tcache_enabled;
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cassert(config_tcache);
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tsd = tsd_fetch();
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tcache_enabled = (tcache_enabled_t)enabled;
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tsd_tcache_enabled_set(tsd, tcache_enabled);
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if (!enabled)
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tcache_cleanup(tsd);
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}
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JEMALLOC_ALWAYS_INLINE tcache_t *
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tcache_get(tsd_t *tsd, bool create)
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{
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tcache_t *tcache;
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if (!config_tcache)
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return (NULL);
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tcache = tsd_tcache_get(tsd);
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if (!create)
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return (tcache);
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if (unlikely(tcache == NULL) && tsd_nominal(tsd)) {
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tcache = tcache_get_hard(tsd);
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tsd_tcache_set(tsd, tcache);
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}
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return (tcache);
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}
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JEMALLOC_ALWAYS_INLINE void
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tcache_event(tsd_t *tsd, 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 (unlikely(tcache->ev_cnt == TCACHE_GC_INCR))
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tcache_event_hard(tsd, tcache);
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}
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JEMALLOC_ALWAYS_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 (unlikely(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 (unlikely((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_ALWAYS_INLINE void *
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tcache_alloc_small(tsd_t *tsd, tcache_t *tcache, size_t size, bool zero)
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{
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void *ret;
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index_t binind;
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size_t usize;
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tcache_bin_t *tbin;
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binind = size2index(size);
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assert(binind < NBINS);
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tbin = &tcache->tbins[binind];
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usize = index2size(binind);
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ret = tcache_alloc_easy(tbin);
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if (unlikely(ret == NULL)) {
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ret = tcache_alloc_small_hard(tsd, 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(tcache_salloc(ret) == usize);
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if (likely(!zero)) {
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if (config_fill) {
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if (unlikely(opt_junk_alloc)) {
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arena_alloc_junk_small(ret,
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&arena_bin_info[binind], false);
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} else if (unlikely(opt_zero))
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memset(ret, 0, usize);
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}
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} else {
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if (config_fill && unlikely(opt_junk_alloc)) {
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arena_alloc_junk_small(ret, &arena_bin_info[binind],
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true);
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}
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memset(ret, 0, usize);
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}
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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 += usize;
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tcache_event(tsd, tcache);
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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, tcache_t *tcache, size_t size, bool zero)
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{
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void *ret;
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index_t binind;
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size_t usize;
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tcache_bin_t *tbin;
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binind = size2index(size);
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usize = index2size(binind);
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assert(usize <= tcache_maxclass);
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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 (unlikely(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(arena_choose(tsd, NULL), usize, 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 && usize == LARGE_MINCLASS) {
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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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LG_PAGE);
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arena_mapbits_large_binind_set(chunk, pageind,
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BININD_INVALID);
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}
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if (likely(!zero)) {
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if (config_fill) {
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if (unlikely(opt_junk_alloc))
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memset(ret, 0xa5, usize);
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else if (unlikely(opt_zero))
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memset(ret, 0, usize);
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}
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} else
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memset(ret, 0, usize);
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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 += usize;
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}
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tcache_event(tsd, tcache);
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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, index_t binind)
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{
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tcache_bin_t *tbin;
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tcache_bin_info_t *tbin_info;
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assert(tcache_salloc(ptr) <= SMALL_MAXCLASS);
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if (config_fill && unlikely(opt_junk_free))
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arena_dalloc_junk_small(ptr, &arena_bin_info[binind]);
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tbin = &tcache->tbins[binind];
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tbin_info = &tcache_bin_info[binind];
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if (unlikely(tbin->ncached == tbin_info->ncached_max)) {
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tcache_bin_flush_small(tsd, tbin, binind,
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(tbin_info->ncached_max >> 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(tsd, tcache);
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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, size_t size)
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{
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index_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(tcache_salloc(ptr) > SMALL_MAXCLASS);
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assert(tcache_salloc(ptr) <= tcache_maxclass);
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binind = size2index(size);
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if (config_fill && unlikely(opt_junk_free))
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arena_dalloc_junk_large(ptr, size);
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tbin = &tcache->tbins[binind];
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tbin_info = &tcache_bin_info[binind];
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if (unlikely(tbin->ncached == tbin_info->ncached_max)) {
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tcache_bin_flush_large(tsd, tbin, binind,
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(tbin_info->ncached_max >> 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(tsd, tcache);
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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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{
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tcaches_t *elm = &tcaches[ind];
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if (unlikely(elm->tcache == NULL))
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elm->tcache = tcache_create(tsd, arena_choose(tsd, NULL));
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return (elm->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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