server-skynet-source-3rd-je.../include/jemalloc/internal/tcache.h
Jason Evans 962463d9b5 Streamline tcache-related malloc/free fast paths.
tcache_get() is inlined, so do the config_tcache check inside
tcache_get() and simplify its callers.

Make arena_malloc() an inline function, since it is part of the malloc()
fast path.

Remove conditional logic that cause build issues if --disable-tcache was
specified.
2012-02-13 12:29:49 -08:00

397 lines
10 KiB
C

/******************************************************************************/
#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;
/*
* 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
/*
* (1U << opt_lg_tcache_gc_sweep) is the approximate number of allocation
* events between full GC sweeps (-1: disabled). Integer rounding may cause
* the actual number to be slightly higher, since GC is performed
* incrementally.
*/
#define LG_TCACHE_GC_SWEEP_DEFAULT 13
#endif /* JEMALLOC_H_TYPES */
/******************************************************************************/
#ifdef JEMALLOC_H_STRUCTS
/*
* 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 ssize_t opt_lg_tcache_gc_sweep;
extern tcache_bin_info_t *tcache_bin_info;
/* Map of thread-specific caches. */
#ifndef NO_TLS
extern __thread tcache_t *tcache_tls
JEMALLOC_ATTR(tls_model("initial-exec"));
# define TCACHE_GET() tcache_tls
# define TCACHE_SET(v) do { \
tcache_tls = (tcache_t *)(v); \
pthread_setspecific(tcache_tsd, (void *)(v)); \
} while (0)
#else
# define TCACHE_GET() ((tcache_t *)pthread_getspecific(tcache_tsd))
# define TCACHE_SET(v) do { \
pthread_setspecific(tcache_tsd, (void *)(v)); \
} while (0)
#endif
extern pthread_key_t tcache_tsd;
/*
* 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;
/* Number of tcache allocation/deallocation events between incremental GCs. */
extern unsigned tcache_gc_incr;
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);
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_stats_merge(tcache_t *tcache, arena_t *arena);
bool tcache_boot(void);
#endif /* JEMALLOC_H_EXTERNS */
/******************************************************************************/
#ifdef JEMALLOC_H_INLINES
#ifndef JEMALLOC_ENABLE_INLINE
void tcache_event(tcache_t *tcache);
tcache_t *tcache_get(void);
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_))
JEMALLOC_INLINE tcache_t *
tcache_get(void)
{
tcache_t *tcache;
if (config_tcache == false)
return (NULL);
if (config_lazy_lock && (isthreaded & opt_tcache) == false)
return (NULL);
else if (opt_tcache == false)
return (NULL);
tcache = TCACHE_GET();
if ((uintptr_t)tcache <= (uintptr_t)2) {
if (tcache == NULL) {
tcache = tcache_create(choose_arena());
if (tcache == NULL)
return (NULL);
} else {
if (tcache == (void *)(uintptr_t)1) {
/*
* Make a note that an allocator function was
* called after the tcache_thread_cleanup() was
* called.
*/
TCACHE_SET((uintptr_t)2);
}
return (NULL);
}
}
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) == arena_bin_info[binind].reg_size);
if (zero == false) {
if (config_fill) {
if (opt_junk)
memset(ret, 0xa5, size);
else if (opt_zero)
memset(ret, 0, size);
}
} else
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 >> PAGE_SHIFT) - 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) >>
PAGE_SHIFT);
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
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) <= small_maxclass);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
arena = chunk->arena;
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT;
mapelm = &chunk->map[pageind-map_bias];
run = (arena_run_t *)((uintptr_t)chunk + (uintptr_t)((pageind -
(mapelm->bits >> PAGE_SHIFT)) << PAGE_SHIFT));
bin = run->bin;
binind = ((uintptr_t)bin - (uintptr_t)&arena->bins) /
sizeof(arena_bin_t);
assert(binind < nbins);
if (config_fill && opt_junk)
memset(ptr, 0x5a, arena_bin_info[binind].reg_size);
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)
{
arena_t *arena;
arena_chunk_t *chunk;
size_t pageind, binind;
tcache_bin_t *tbin;
tcache_bin_info_t *tbin_info;
assert((size & PAGE_MASK) == 0);
assert(arena_salloc(ptr) > small_maxclass);
assert(arena_salloc(ptr) <= tcache_maxclass);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
arena = chunk->arena;
pageind = ((uintptr_t)ptr - (uintptr_t)chunk) >> PAGE_SHIFT;
binind = nbins + (size >> PAGE_SHIFT) - 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 */
/******************************************************************************/