| /******************************************************************************/ |
| #ifdef JEMALLOC_H_TYPES |
| |
| typedef struct tcache_bin_info_s tcache_bin_info_t; |
| typedef struct tcache_bin_s tcache_bin_t; |
| typedef struct tcache_s tcache_t; |
| |
| /* |
| * tcache pointers close to NULL are used to encode state information that is |
| * used for two purposes: preventing thread caching on a per thread basis and |
| * cleaning up during thread shutdown. |
| */ |
| #define TCACHE_STATE_DISABLED ((tcache_t *)(uintptr_t)1) |
| #define TCACHE_STATE_REINCARNATED ((tcache_t *)(uintptr_t)2) |
| #define TCACHE_STATE_PURGATORY ((tcache_t *)(uintptr_t)3) |
| #define TCACHE_STATE_MAX TCACHE_STATE_PURGATORY |
| |
| /* |
| * Absolute maximum number of cache slots for each small bin in the thread |
| * cache. This is an additional constraint beyond that imposed as: twice the |
| * number of regions per run for this size class. |
| * |
| * This constant must be an even number. |
| */ |
| #define TCACHE_NSLOTS_SMALL_MAX 200 |
| |
| /* Number of cache slots for large size classes. */ |
| #define TCACHE_NSLOTS_LARGE 20 |
| |
| /* (1U << opt_lg_tcache_max) is used to compute tcache_maxclass. */ |
| #define LG_TCACHE_MAXCLASS_DEFAULT 15 |
| |
| /* |
| * TCACHE_GC_SWEEP is the approximate number of allocation events between |
| * full GC sweeps. Integer rounding may cause the actual number to be |
| * slightly higher, since GC is performed incrementally. |
| */ |
| #define TCACHE_GC_SWEEP 8192 |
| |
| /* Number of tcache allocation/deallocation events between incremental GCs. */ |
| #define TCACHE_GC_INCR \ |
| ((TCACHE_GC_SWEEP / NBINS) + ((TCACHE_GC_SWEEP / NBINS == 0) ? 0 : 1)) |
| |
| #endif /* JEMALLOC_H_TYPES */ |
| /******************************************************************************/ |
| #ifdef JEMALLOC_H_STRUCTS |
| |
| typedef enum { |
| tcache_enabled_false = 0, /* Enable cast to/from bool. */ |
| tcache_enabled_true = 1, |
| tcache_enabled_default = 2 |
| } tcache_enabled_t; |
| |
| /* |
| * Read-only information associated with each element of tcache_t's tbins array |
| * is stored separately, mainly to reduce memory usage. |
| */ |
| struct tcache_bin_info_s { |
| unsigned ncached_max; /* Upper limit on ncached. */ |
| }; |
| |
| struct tcache_bin_s { |
| tcache_bin_stats_t tstats; |
| int low_water; /* Min # cached since last GC. */ |
| unsigned lg_fill_div; /* Fill (ncached_max >> lg_fill_div). */ |
| unsigned ncached; /* # of cached objects. */ |
| void **avail; /* Stack of available objects. */ |
| }; |
| |
| struct tcache_s { |
| ql_elm(tcache_t) link; /* Used for aggregating stats. */ |
| uint64_t prof_accumbytes;/* Cleared after arena_prof_accum() */ |
| arena_t *arena; /* This thread's arena. */ |
| unsigned ev_cnt; /* Event count since incremental GC. */ |
| unsigned next_gc_bin; /* Next bin to GC. */ |
| tcache_bin_t tbins[1]; /* Dynamically sized. */ |
| /* |
| * The pointer stacks associated with tbins follow as a contiguous |
| * array. During tcache initialization, the avail pointer in each |
| * element of tbins is initialized to point to the proper offset within |
| * this array. |
| */ |
| }; |
| |
| #endif /* JEMALLOC_H_STRUCTS */ |
| /******************************************************************************/ |
| #ifdef JEMALLOC_H_EXTERNS |
| |
| extern bool opt_tcache; |
| extern ssize_t opt_lg_tcache_max; |
| |
| extern tcache_bin_info_t *tcache_bin_info; |
| |
| /* |
| * Number of tcache bins. There are NBINS small-object bins, plus 0 or more |
| * large-object bins. |
| */ |
| extern size_t nhbins; |
| |
| /* Maximum cached size class. */ |
| extern size_t tcache_maxclass; |
| |
| void tcache_bin_flush_small(tcache_bin_t *tbin, size_t binind, unsigned rem, |
| tcache_t *tcache); |
| void tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem, |
| tcache_t *tcache); |
| void tcache_arena_associate(tcache_t *tcache, arena_t *arena); |
| void tcache_arena_dissociate(tcache_t *tcache); |
| tcache_t *tcache_create(arena_t *arena); |
| void *tcache_alloc_small_hard(tcache_t *tcache, tcache_bin_t *tbin, |
| size_t binind); |
| void tcache_destroy(tcache_t *tcache); |
| void tcache_thread_cleanup(void *arg); |
| void tcache_stats_merge(tcache_t *tcache, arena_t *arena); |
| bool tcache_boot0(void); |
| bool tcache_boot1(void); |
| |
| #endif /* JEMALLOC_H_EXTERNS */ |
| /******************************************************************************/ |
| #ifdef JEMALLOC_H_INLINES |
| |
| #ifndef JEMALLOC_ENABLE_INLINE |
| malloc_tsd_protos(JEMALLOC_ATTR(unused), tcache, tcache_t *) |
| malloc_tsd_protos(JEMALLOC_ATTR(unused), tcache_enabled, tcache_enabled_t) |
| |
| void tcache_event(tcache_t *tcache); |
| void tcache_flush(void); |
| bool tcache_enabled_get(void); |
| tcache_t *tcache_get(bool create); |
| void tcache_enabled_set(bool enabled); |
| void *tcache_alloc_easy(tcache_bin_t *tbin); |
| void *tcache_alloc_small(tcache_t *tcache, size_t size, bool zero); |
| void *tcache_alloc_large(tcache_t *tcache, size_t size, bool zero); |
| void tcache_dalloc_small(tcache_t *tcache, void *ptr); |
| void tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size); |
| #endif |
| |
| #if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_TCACHE_C_)) |
| /* Map of thread-specific caches. */ |
| malloc_tsd_externs(tcache, tcache_t *) |
| malloc_tsd_funcs(JEMALLOC_INLINE, tcache, tcache_t *, NULL, |
| tcache_thread_cleanup) |
| /* Per thread flag that allows thread caches to be disabled. */ |
| malloc_tsd_externs(tcache_enabled, tcache_enabled_t) |
| malloc_tsd_funcs(JEMALLOC_INLINE, tcache_enabled, tcache_enabled_t, |
| tcache_enabled_default, malloc_tsd_no_cleanup) |
| |
| JEMALLOC_INLINE void |
| tcache_flush(void) |
| { |
| tcache_t *tcache; |
| |
| cassert(config_tcache); |
| |
| tcache = *tcache_tsd_get(); |
| if ((uintptr_t)tcache <= (uintptr_t)TCACHE_STATE_MAX) |
| return; |
| tcache_destroy(tcache); |
| tcache = NULL; |
| tcache_tsd_set(&tcache); |
| } |
| |
| JEMALLOC_INLINE bool |
| tcache_enabled_get(void) |
| { |
| tcache_enabled_t tcache_enabled; |
| |
| cassert(config_tcache); |
| |
| tcache_enabled = *tcache_enabled_tsd_get(); |
| if (tcache_enabled == tcache_enabled_default) { |
| tcache_enabled = (tcache_enabled_t)opt_tcache; |
| tcache_enabled_tsd_set(&tcache_enabled); |
| } |
| |
| return ((bool)tcache_enabled); |
| } |
| |
| JEMALLOC_INLINE void |
| tcache_enabled_set(bool enabled) |
| { |
| tcache_enabled_t tcache_enabled; |
| tcache_t *tcache; |
| |
| cassert(config_tcache); |
| |
| tcache_enabled = (tcache_enabled_t)enabled; |
| tcache_enabled_tsd_set(&tcache_enabled); |
| tcache = *tcache_tsd_get(); |
| if (enabled) { |
| if (tcache == TCACHE_STATE_DISABLED) { |
| tcache = NULL; |
| tcache_tsd_set(&tcache); |
| } |
| } else /* disabled */ { |
| if (tcache > TCACHE_STATE_MAX) { |
| tcache_destroy(tcache); |
| tcache = NULL; |
| } |
| if (tcache == NULL) { |
| tcache = TCACHE_STATE_DISABLED; |
| tcache_tsd_set(&tcache); |
| } |
| } |
| } |
| |
| JEMALLOC_INLINE tcache_t * |
| tcache_get(bool create) |
| { |
| tcache_t *tcache; |
| |
| if (config_tcache == false) |
| return (NULL); |
| if (config_lazy_lock && isthreaded == false) |
| return (NULL); |
| |
| tcache = *tcache_tsd_get(); |
| if ((uintptr_t)tcache <= (uintptr_t)TCACHE_STATE_MAX) { |
| if (tcache == TCACHE_STATE_DISABLED) |
| return (NULL); |
| if (tcache == NULL) { |
| if (create == false) { |
| /* |
| * Creating a tcache here would cause |
| * allocation as a side effect of free(). |
| * Ordinarily that would be okay since |
| * tcache_create() failure is a soft failure |
| * that doesn't propagate. However, if TLS |
| * data are freed via free() as in glibc, |
| * subtle corruption could result from setting |
| * a TLS variable after its backing memory is |
| * freed. |
| */ |
| return (NULL); |
| } |
| if (tcache_enabled_get() == false) { |
| tcache_enabled_set(false); /* Memoize. */ |
| return (NULL); |
| } |
| return (tcache_create(choose_arena(NULL))); |
| } |
| if (tcache == TCACHE_STATE_PURGATORY) { |
| /* |
| * Make a note that an allocator function was called |
| * after tcache_thread_cleanup() was called. |
| */ |
| tcache = TCACHE_STATE_REINCARNATED; |
| tcache_tsd_set(&tcache); |
| return (NULL); |
| } |
| if (tcache == TCACHE_STATE_REINCARNATED) |
| return (NULL); |
| not_reached(); |
| } |
| |
| return (tcache); |
| } |
| |
| JEMALLOC_INLINE void |
| tcache_event(tcache_t *tcache) |
| { |
| |
| if (TCACHE_GC_INCR == 0) |
| return; |
| |
| tcache->ev_cnt++; |
| assert(tcache->ev_cnt <= TCACHE_GC_INCR); |
| if (tcache->ev_cnt == TCACHE_GC_INCR) { |
| size_t binind = tcache->next_gc_bin; |
| tcache_bin_t *tbin = &tcache->tbins[binind]; |
| tcache_bin_info_t *tbin_info = &tcache_bin_info[binind]; |
| |
| if (tbin->low_water > 0) { |
| /* |
| * Flush (ceiling) 3/4 of the objects below the low |
| * water mark. |
| */ |
| if (binind < NBINS) { |
| tcache_bin_flush_small(tbin, binind, |
| tbin->ncached - tbin->low_water + |
| (tbin->low_water >> 2), tcache); |
| } else { |
| tcache_bin_flush_large(tbin, binind, |
| tbin->ncached - tbin->low_water + |
| (tbin->low_water >> 2), tcache); |
| } |
| /* |
| * Reduce fill count by 2X. Limit lg_fill_div such that |
| * the fill count is always at least 1. |
| */ |
| if ((tbin_info->ncached_max >> (tbin->lg_fill_div+1)) |
| >= 1) |
| tbin->lg_fill_div++; |
| } else if (tbin->low_water < 0) { |
| /* |
| * Increase fill count by 2X. Make sure lg_fill_div |
| * stays greater than 0. |
| */ |
| if (tbin->lg_fill_div > 1) |
| tbin->lg_fill_div--; |
| } |
| tbin->low_water = tbin->ncached; |
| |
| tcache->next_gc_bin++; |
| if (tcache->next_gc_bin == nhbins) |
| tcache->next_gc_bin = 0; |
| tcache->ev_cnt = 0; |
| } |
| } |
| |
| JEMALLOC_INLINE void * |
| tcache_alloc_easy(tcache_bin_t *tbin) |
| { |
| void *ret; |
| |
| if (tbin->ncached == 0) { |
| tbin->low_water = -1; |
| return (NULL); |
| } |
| tbin->ncached--; |
| if ((int)tbin->ncached < tbin->low_water) |
| tbin->low_water = tbin->ncached; |
| ret = tbin->avail[tbin->ncached]; |
| return (ret); |
| } |
| |
| JEMALLOC_INLINE void * |
| tcache_alloc_small(tcache_t *tcache, size_t size, bool zero) |
| { |
| void *ret; |
| size_t binind; |
| tcache_bin_t *tbin; |
| |
| binind = SMALL_SIZE2BIN(size); |
| assert(binind < NBINS); |
| tbin = &tcache->tbins[binind]; |
| ret = tcache_alloc_easy(tbin); |
| if (ret == NULL) { |
| ret = tcache_alloc_small_hard(tcache, tbin, binind); |
| if (ret == NULL) |
| return (NULL); |
| } |
| assert(arena_salloc(ret, false) == arena_bin_info[binind].reg_size); |
| |
| if (zero == false) { |
| if (config_fill) { |
| if (opt_junk) { |
| arena_alloc_junk_small(ret, |
| &arena_bin_info[binind], false); |
| } else if (opt_zero) |
| memset(ret, 0, size); |
| } |
| } else { |
| if (config_fill && opt_junk) { |
| arena_alloc_junk_small(ret, &arena_bin_info[binind], |
| true); |
| } |
| VALGRIND_MAKE_MEM_UNDEFINED(ret, size); |
| memset(ret, 0, size); |
| } |
| |
| if (config_stats) |
| tbin->tstats.nrequests++; |
| if (config_prof) |
| tcache->prof_accumbytes += arena_bin_info[binind].reg_size; |
| tcache_event(tcache); |
| return (ret); |
| } |
| |
| JEMALLOC_INLINE void * |
| tcache_alloc_large(tcache_t *tcache, size_t size, bool zero) |
| { |
| void *ret; |
| size_t binind; |
| tcache_bin_t *tbin; |
| |
| size = PAGE_CEILING(size); |
| assert(size <= tcache_maxclass); |
| binind = NBINS + (size >> LG_PAGE) - 1; |
| assert(binind < nhbins); |
| tbin = &tcache->tbins[binind]; |
| ret = tcache_alloc_easy(tbin); |
| if (ret == NULL) { |
| /* |
| * Only allocate one large object at a time, because it's quite |
| * expensive to create one and not use it. |
| */ |
| ret = arena_malloc_large(tcache->arena, size, zero); |
| if (ret == NULL) |
| return (NULL); |
| } else { |
| if (config_prof) { |
| arena_chunk_t *chunk = |
| (arena_chunk_t *)CHUNK_ADDR2BASE(ret); |
| size_t pageind = (((uintptr_t)ret - (uintptr_t)chunk) >> |
| LG_PAGE); |
| chunk->map[pageind-map_bias].bits &= |
| ~CHUNK_MAP_CLASS_MASK; |
| } |
| if (zero == false) { |
| if (config_fill) { |
| if (opt_junk) |
| memset(ret, 0xa5, size); |
| else if (opt_zero) |
| memset(ret, 0, size); |
| } |
| } else { |
| VALGRIND_MAKE_MEM_UNDEFINED(ret, size); |
| memset(ret, 0, size); |
| } |
| |
| if (config_stats) |
| tbin->tstats.nrequests++; |
| if (config_prof) |
| tcache->prof_accumbytes += size; |
| } |
| |
| tcache_event(tcache); |
| return (ret); |
| } |
| |
| JEMALLOC_INLINE void |
| tcache_dalloc_small(tcache_t *tcache, void *ptr) |
| { |
| arena_t *arena; |
| arena_chunk_t *chunk; |
| arena_run_t *run; |
| arena_bin_t *bin; |
| tcache_bin_t *tbin; |
| tcache_bin_info_t *tbin_info; |
| size_t pageind, binind; |
| arena_chunk_map_t *mapelm; |
| |
| assert(arena_salloc(ptr, false) <= SMALL_MAXCLASS); |
| |
| chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr); |
| arena = chunk->arena; |
| pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> LG_PAGE; |
| mapelm = &chunk->map[pageind-map_bias]; |
| run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind - |
| (mapelm->bits >> LG_PAGE)) << LG_PAGE)); |
| bin = run->bin; |
| binind = ((uintptr_t)bin - (uintptr_t)&arena->bins) / |
| sizeof(arena_bin_t); |
| assert(binind < NBINS); |
| |
| if (config_fill && opt_junk) |
| arena_dalloc_junk_small(ptr, &arena_bin_info[binind]); |
| |
| tbin = &tcache->tbins[binind]; |
| tbin_info = &tcache_bin_info[binind]; |
| if (tbin->ncached == tbin_info->ncached_max) { |
| tcache_bin_flush_small(tbin, binind, (tbin_info->ncached_max >> |
| 1), tcache); |
| } |
| assert(tbin->ncached < tbin_info->ncached_max); |
| tbin->avail[tbin->ncached] = ptr; |
| tbin->ncached++; |
| |
| tcache_event(tcache); |
| } |
| |
| JEMALLOC_INLINE void |
| tcache_dalloc_large(tcache_t *tcache, void *ptr, size_t size) |
| { |
| size_t binind; |
| tcache_bin_t *tbin; |
| tcache_bin_info_t *tbin_info; |
| |
| assert((size & PAGE_MASK) == 0); |
| assert(arena_salloc(ptr, false) > SMALL_MAXCLASS); |
| assert(arena_salloc(ptr, false) <= tcache_maxclass); |
| |
| binind = NBINS + (size >> LG_PAGE) - 1; |
| |
| if (config_fill && opt_junk) |
| memset(ptr, 0x5a, size); |
| |
| tbin = &tcache->tbins[binind]; |
| tbin_info = &tcache_bin_info[binind]; |
| if (tbin->ncached == tbin_info->ncached_max) { |
| tcache_bin_flush_large(tbin, binind, (tbin_info->ncached_max >> |
| 1), tcache); |
| } |
| assert(tbin->ncached < tbin_info->ncached_max); |
| tbin->avail[tbin->ncached] = ptr; |
| tbin->ncached++; |
| |
| tcache_event(tcache); |
| } |
| #endif |
| |
| #endif /* JEMALLOC_H_INLINES */ |
| /******************************************************************************/ |