server-skynet-source-3rd-je.../src/tcache.c

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#define JEMALLOC_TCACHE_C_
2010-02-12 06:45:59 +08:00
#include "jemalloc/internal/jemalloc_internal.h"
#ifdef JEMALLOC_TCACHE
/******************************************************************************/
/* Data. */
bool opt_tcache = true;
ssize_t opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT;
ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT;
tcache_bin_info_t *tcache_bin_info;
static unsigned stack_nelms; /* Total stack elms per tcache. */
/* Map of thread-specific caches. */
#ifndef NO_TLS
__thread tcache_t *tcache_tls JEMALLOC_ATTR(tls_model("initial-exec"));
#endif
/*
* Same contents as tcache, but initialized such that the TSD destructor is
* called when a thread exits, so that the cache can be cleaned up.
*/
pthread_key_t tcache_tsd;
size_t nhbins;
size_t tcache_maxclass;
unsigned tcache_gc_incr;
/******************************************************************************/
/* Function prototypes for non-inline static functions. */
static void tcache_thread_cleanup(void *arg);
/******************************************************************************/
void *
tcache_alloc_small_hard(tcache_t *tcache, tcache_bin_t *tbin, size_t binind)
{
void *ret;
arena_tcache_fill_small(tcache->arena, tbin, binind
#ifdef JEMALLOC_PROF
, tcache->prof_accumbytes
#endif
);
#ifdef JEMALLOC_PROF
tcache->prof_accumbytes = 0;
#endif
ret = tcache_alloc_easy(tbin);
return (ret);
}
void
tcache_bin_flush_small(tcache_bin_t *tbin, size_t binind, unsigned rem
#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
, tcache_t *tcache
#endif
)
{
void *ptr;
unsigned i, nflush, ndeferred;
#ifdef JEMALLOC_STATS
bool merged_stats = false;
#endif
assert(binind < nbins);
assert(rem <= tbin->ncached);
for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
/* Lock the arena bin associated with the first object. */
arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
tbin->avail[0]);
arena_t *arena = chunk->arena;
arena_bin_t *bin = &arena->bins[binind];
#ifdef JEMALLOC_PROF
if (arena == tcache->arena) {
malloc_mutex_lock(&arena->lock);
arena_prof_accum(arena, tcache->prof_accumbytes);
malloc_mutex_unlock(&arena->lock);
tcache->prof_accumbytes = 0;
}
#endif
malloc_mutex_lock(&bin->lock);
#ifdef JEMALLOC_STATS
if (arena == tcache->arena) {
assert(merged_stats == false);
merged_stats = true;
bin->stats.nflushes++;
bin->stats.nrequests += tbin->tstats.nrequests;
tbin->tstats.nrequests = 0;
}
#endif
ndeferred = 0;
for (i = 0; i < nflush; i++) {
ptr = tbin->avail[i];
assert(ptr != NULL);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
if (chunk->arena == arena) {
size_t pageind = ((uintptr_t)ptr -
(uintptr_t)chunk) >> PAGE_SHIFT;
arena_chunk_map_t *mapelm =
&chunk->map[pageind-map_bias];
arena_dalloc_bin(arena, chunk, ptr, mapelm);
} else {
/*
* This object was allocated via a different
* arena bin than the one that is currently
* locked. Stash the object, so that it can be
* handled in a future pass.
*/
tbin->avail[ndeferred] = ptr;
ndeferred++;
}
}
malloc_mutex_unlock(&bin->lock);
}
#ifdef JEMALLOC_STATS
if (merged_stats == false) {
/*
* The flush loop didn't happen to flush to this thread's
* arena, so the stats didn't get merged. Manually do so now.
*/
arena_bin_t *bin = &tcache->arena->bins[binind];
malloc_mutex_lock(&bin->lock);
bin->stats.nflushes++;
bin->stats.nrequests += tbin->tstats.nrequests;
tbin->tstats.nrequests = 0;
malloc_mutex_unlock(&bin->lock);
}
#endif
memmove(tbin->avail, &tbin->avail[tbin->ncached - rem],
rem * sizeof(void *));
tbin->ncached = rem;
if ((int)tbin->ncached < tbin->low_water)
tbin->low_water = tbin->ncached;
}
void
tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem
#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
, tcache_t *tcache
#endif
)
{
void *ptr;
unsigned i, nflush, ndeferred;
#ifdef JEMALLOC_STATS
bool merged_stats = false;
#endif
assert(binind < nhbins);
assert(rem <= tbin->ncached);
for (nflush = tbin->ncached - rem; nflush > 0; nflush = ndeferred) {
/* Lock the arena associated with the first object. */
arena_chunk_t *chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(
tbin->avail[0]);
arena_t *arena = chunk->arena;
malloc_mutex_lock(&arena->lock);
#if (defined(JEMALLOC_PROF) || defined(JEMALLOC_STATS))
if (arena == tcache->arena) {
#endif
#ifdef JEMALLOC_PROF
arena_prof_accum(arena, tcache->prof_accumbytes);
tcache->prof_accumbytes = 0;
#endif
#ifdef JEMALLOC_STATS
merged_stats = true;
arena->stats.nrequests_large += tbin->tstats.nrequests;
arena->stats.lstats[binind - nbins].nrequests +=
tbin->tstats.nrequests;
tbin->tstats.nrequests = 0;
#endif
#if (defined(JEMALLOC_PROF) || defined(JEMALLOC_STATS))
}
#endif
ndeferred = 0;
for (i = 0; i < nflush; i++) {
ptr = tbin->avail[i];
assert(ptr != NULL);
chunk = (arena_chunk_t *)CHUNK_ADDR2BASE(ptr);
if (chunk->arena == arena)
arena_dalloc_large(arena, chunk, ptr);
else {
/*
* This object was allocated via a different
* arena than the one that is currently locked.
* Stash the object, so that it can be handled
* in a future pass.
*/
tbin->avail[ndeferred] = ptr;
ndeferred++;
}
}
malloc_mutex_unlock(&arena->lock);
}
#ifdef JEMALLOC_STATS
if (merged_stats == false) {
/*
* The flush loop didn't happen to flush to this thread's
* arena, so the stats didn't get merged. Manually do so now.
*/
arena_t *arena = tcache->arena;
malloc_mutex_lock(&arena->lock);
arena->stats.nrequests_large += tbin->tstats.nrequests;
arena->stats.lstats[binind - nbins].nrequests +=
tbin->tstats.nrequests;
tbin->tstats.nrequests = 0;
malloc_mutex_unlock(&arena->lock);
}
#endif
memmove(tbin->avail, &tbin->avail[tbin->ncached - rem],
rem * sizeof(void *));
tbin->ncached = rem;
if ((int)tbin->ncached < tbin->low_water)
tbin->low_water = tbin->ncached;
}
tcache_t *
tcache_create(arena_t *arena)
{
tcache_t *tcache;
size_t size, stack_offset;
unsigned i;
size = offsetof(tcache_t, tbins) + (sizeof(tcache_bin_t) * nhbins);
/* Naturally align the pointer stacks. */
size = PTR_CEILING(size);
stack_offset = size;
size += stack_nelms * sizeof(void *);
/*
* Round up to the nearest multiple of the cacheline size, in order to
* avoid the possibility of false cacheline sharing.
*
* That this works relies on the same logic as in ipalloc(), but we
* cannot directly call ipalloc() here due to tcache bootstrapping
* issues.
*/
size = (size + CACHELINE_MASK) & (-CACHELINE);
if (size <= small_maxclass)
tcache = (tcache_t *)arena_malloc_small(arena, size, true);
else if (size <= tcache_maxclass)
tcache = (tcache_t *)arena_malloc_large(arena, size, true);
else
tcache = (tcache_t *)icalloc(size);
if (tcache == NULL)
return (NULL);
#ifdef JEMALLOC_STATS
/* Link into list of extant tcaches. */
malloc_mutex_lock(&arena->lock);
ql_elm_new(tcache, link);
ql_tail_insert(&arena->tcache_ql, tcache, link);
malloc_mutex_unlock(&arena->lock);
#endif
tcache->arena = arena;
assert((TCACHE_NSLOTS_SMALL_MAX & 1U) == 0);
for (i = 0; i < nhbins; i++) {
tcache->tbins[i].lg_fill_div = 1;
tcache->tbins[i].avail = (void **)((uintptr_t)tcache +
(uintptr_t)stack_offset);
stack_offset += tcache_bin_info[i].ncached_max * sizeof(void *);
}
TCACHE_SET(tcache);
return (tcache);
}
void
tcache_destroy(tcache_t *tcache)
{
unsigned i;
size_t tcache_size;
#ifdef JEMALLOC_STATS
/* Unlink from list of extant tcaches. */
malloc_mutex_lock(&tcache->arena->lock);
ql_remove(&tcache->arena->tcache_ql, tcache, link);
malloc_mutex_unlock(&tcache->arena->lock);
tcache_stats_merge(tcache, tcache->arena);
#endif
for (i = 0; i < nbins; i++) {
tcache_bin_t *tbin = &tcache->tbins[i];
tcache_bin_flush_small(tbin, i, 0
#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
, tcache
#endif
);
#ifdef JEMALLOC_STATS
if (tbin->tstats.nrequests != 0) {
arena_t *arena = tcache->arena;
arena_bin_t *bin = &arena->bins[i];
malloc_mutex_lock(&bin->lock);
bin->stats.nrequests += tbin->tstats.nrequests;
malloc_mutex_unlock(&bin->lock);
}
#endif
}
for (; i < nhbins; i++) {
tcache_bin_t *tbin = &tcache->tbins[i];
tcache_bin_flush_large(tbin, i, 0
#if (defined(JEMALLOC_STATS) || defined(JEMALLOC_PROF))
, tcache
#endif
);
#ifdef JEMALLOC_STATS
if (tbin->tstats.nrequests != 0) {
arena_t *arena = tcache->arena;
malloc_mutex_lock(&arena->lock);
arena->stats.nrequests_large += tbin->tstats.nrequests;
arena->stats.lstats[i - nbins].nrequests +=
tbin->tstats.nrequests;
malloc_mutex_unlock(&arena->lock);
}
#endif
}
#ifdef JEMALLOC_PROF
if (tcache->prof_accumbytes > 0) {
malloc_mutex_lock(&tcache->arena->lock);
arena_prof_accum(tcache->arena, tcache->prof_accumbytes);
malloc_mutex_unlock(&tcache->arena->lock);
}
#endif
tcache_size = arena_salloc(tcache);
if (tcache_size <= small_maxclass) {
arena_chunk_t *chunk = CHUNK_ADDR2BASE(tcache);
arena_t *arena = chunk->arena;
size_t pageind = ((uintptr_t)tcache - (uintptr_t)chunk) >>
PAGE_SHIFT;
arena_chunk_map_t *mapelm = &chunk->map[pageind-map_bias];
arena_run_t *run = (arena_run_t *)((uintptr_t)chunk +
(uintptr_t)((pageind - (mapelm->bits >> PAGE_SHIFT)) <<
PAGE_SHIFT));
arena_bin_t *bin = run->bin;
malloc_mutex_lock(&bin->lock);
arena_dalloc_bin(arena, chunk, tcache, mapelm);
malloc_mutex_unlock(&bin->lock);
} else if (tcache_size <= tcache_maxclass) {
arena_chunk_t *chunk = CHUNK_ADDR2BASE(tcache);
arena_t *arena = chunk->arena;
malloc_mutex_lock(&arena->lock);
arena_dalloc_large(arena, chunk, tcache);
malloc_mutex_unlock(&arena->lock);
} else
idalloc(tcache);
}
static void
tcache_thread_cleanup(void *arg)
{
tcache_t *tcache = (tcache_t *)arg;
if (tcache == (void *)(uintptr_t)1) {
/*
* The previous time this destructor was called, we set the key
* to 1 so that other destructors wouldn't cause re-creation of
* the tcache. This time, do nothing, so that the destructor
* will not be called again.
*/
} else if (tcache == (void *)(uintptr_t)2) {
/*
* Another destructor called an allocator function after this
* destructor was called. Reset tcache to 1 in order to
* receive another callback.
*/
TCACHE_SET((uintptr_t)1);
} else if (tcache != NULL) {
assert(tcache != (void *)(uintptr_t)1);
tcache_destroy(tcache);
TCACHE_SET((uintptr_t)1);
}
}
#ifdef JEMALLOC_STATS
void
tcache_stats_merge(tcache_t *tcache, arena_t *arena)
{
unsigned i;
/* Merge and reset tcache stats. */
for (i = 0; i < nbins; i++) {
arena_bin_t *bin = &arena->bins[i];
tcache_bin_t *tbin = &tcache->tbins[i];
malloc_mutex_lock(&bin->lock);
bin->stats.nrequests += tbin->tstats.nrequests;
malloc_mutex_unlock(&bin->lock);
tbin->tstats.nrequests = 0;
}
for (; i < nhbins; i++) {
malloc_large_stats_t *lstats = &arena->stats.lstats[i - nbins];
tcache_bin_t *tbin = &tcache->tbins[i];
arena->stats.nrequests_large += tbin->tstats.nrequests;
lstats->nrequests += tbin->tstats.nrequests;
tbin->tstats.nrequests = 0;
}
}
#endif
bool
tcache_boot(void)
{
if (opt_tcache) {
unsigned i;
/*
* If necessary, clamp opt_lg_tcache_max, now that
* small_maxclass and arena_maxclass are known.
*/
if (opt_lg_tcache_max < 0 || (1U <<
opt_lg_tcache_max) < small_maxclass)
tcache_maxclass = small_maxclass;
else if ((1U << opt_lg_tcache_max) > arena_maxclass)
tcache_maxclass = arena_maxclass;
else
tcache_maxclass = (1U << opt_lg_tcache_max);
nhbins = nbins + (tcache_maxclass >> PAGE_SHIFT);
/* Initialize tcache_bin_info. */
tcache_bin_info = (tcache_bin_info_t *)base_alloc(nhbins *
sizeof(tcache_bin_info_t));
if (tcache_bin_info == NULL)
return (true);
stack_nelms = 0;
for (i = 0; i < nbins; i++) {
if ((arena_bin_info[i].nregs << 1) <=
TCACHE_NSLOTS_SMALL_MAX) {
tcache_bin_info[i].ncached_max =
(arena_bin_info[i].nregs << 1);
} else {
tcache_bin_info[i].ncached_max =
TCACHE_NSLOTS_SMALL_MAX;
}
stack_nelms += tcache_bin_info[i].ncached_max;
}
for (; i < nhbins; i++) {
tcache_bin_info[i].ncached_max = TCACHE_NSLOTS_LARGE;
stack_nelms += tcache_bin_info[i].ncached_max;
}
/* Compute incremental GC event threshold. */
if (opt_lg_tcache_gc_sweep >= 0) {
tcache_gc_incr = ((1U << opt_lg_tcache_gc_sweep) /
nbins) + (((1U << opt_lg_tcache_gc_sweep) % nbins ==
0) ? 0 : 1);
} else
tcache_gc_incr = 0;
if (pthread_key_create(&tcache_tsd, tcache_thread_cleanup) !=
0) {
malloc_write(
"<jemalloc>: Error in pthread_key_create()\n");
abort();
}
}
return (false);
}
/******************************************************************************/
#endif /* JEMALLOC_TCACHE */