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Enhance the H/h MALLOC_OPTIONS flags to control the number of tcache bin slots,

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rather than just enabling/disabling the tcache.

Fix an off-by-one bug in large object stats recording.
This commit is contained in:
Jason Evans 2010-01-03 16:16:10 -08:00
parent 3f3ecfb8e8
commit 279e09d1ff
2 changed files with 82 additions and 63 deletions
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12
jemalloc/doc/jemalloc.3.in
View File

@ -254,15 +254,21 @@ will disable dirty page purging.
@roff_tcache@.Ev JEMALLOC_OPTIONS=14g @roff_tcache@.Ev JEMALLOC_OPTIONS=14g
@roff_tcache@will disable garbage collection. @roff_tcache@will disable garbage collection.
@roff_tcache@.It H @roff_tcache@.It H
@roff_tcache@When there are multiple threads, use thread-specific caching for @roff_tcache@Double/halve the number of thread-specific cache slots per size
@roff_tcache@small and medium objects. @roff_tcache@class.
@roff_tcache@This option is enabled by default. @roff_tcache@When there are multiple threads, each thread uses a
@roff_tcache@thread-specific cache for small and medium objects.
@roff_tcache@Thread-specific caching allows many allocations to be satisfied @roff_tcache@Thread-specific caching allows many allocations to be satisfied
@roff_tcache@without performing any thread synchronization, at the cost of @roff_tcache@without performing any thread synchronization, at the cost of
@roff_tcache@increased memory use. @roff_tcache@increased memory use.
@roff_tcache@See the @roff_tcache@See the
@roff_tcache@.Dq G @roff_tcache@.Dq G
@roff_tcache@option for related tuning information. @roff_tcache@option for related tuning information.
@roff_tcache@The default number of cache slots is 128;
@roff_tcache@.Ev JEMALLOC_OPTIONS=7h
@roff_tcache@will disable thread-specific caching.
@roff_tcache@Note that one cache slot per size class is not a valid
@roff_tcache@configuration due to implementation details.
@roff_fill@.It J @roff_fill@.It J
@roff_fill@Each byte of new memory allocated by @roff_fill@Each byte of new memory allocated by
@roff_fill@.Fn @jemalloc_prefix@malloc @roff_fill@.Fn @jemalloc_prefix@malloc

117
jemalloc/src/jemalloc.c
View File

@ -272,9 +272,11 @@ __FBSDID("$FreeBSD: src/lib/libc/stdlib/malloc.c,v 1.183 2008/12/01 10:20:59 jas
PAGE_SHIFT))) PAGE_SHIFT)))
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
/* Number of cache slots for each bin in the thread cache. */ /*
# define TCACHE_LG_NSLOTS 7 * Default number of cache slots for each bin in the thread cache (0:
# define TCACHE_NSLOTS (1U << TCACHE_LG_NSLOTS) * disabled).
*/
# define LG_TCACHE_NSLOTS_DEFAULT 7
/* /*
* (1U << opt_lg_tcache_gc_sweep) is the approximate number of * (1U << opt_lg_tcache_gc_sweep) is the approximate number of
* allocation events between full GC sweeps (-1: disabled). Integer * allocation events between full GC sweeps (-1: disabled). Integer
@ -721,7 +723,7 @@ struct tcache_bin_s {
unsigned low_water; /* Min # cached since last GC. */ unsigned low_water; /* Min # cached since last GC. */
unsigned high_water; /* Max # cached since last GC. */ unsigned high_water; /* Max # cached since last GC. */
unsigned ncached; /* # of cached objects. */ unsigned ncached; /* # of cached objects. */
void *slots[TCACHE_NSLOTS]; void *slots[1]; /* Dynamically sized. */
}; };
struct tcache_s { struct tcache_s {
@ -1038,6 +1040,12 @@ static __thread tcache_t *tcache_tls
*/ */
static pthread_key_t tcache_tsd; static pthread_key_t tcache_tsd;
/*
* Number of cache slots for each bin in the thread cache, or 0 if tcache is
* disabled.
*/
size_t tcache_nslots;
/* Number of tcache allocation/deallocation events between incremental GCs. */ /* Number of tcache allocation/deallocation events between incremental GCs. */
unsigned tcache_gc_incr; unsigned tcache_gc_incr;
#endif #endif
@ -1080,7 +1088,7 @@ static bool opt_junk = false;
# endif # endif
#endif #endif
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
static bool opt_tcache = true; static size_t opt_lg_tcache_nslots = LG_TCACHE_NSLOTS_DEFAULT;
static ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT; static ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT;
#endif #endif
static ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT; static ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT;
@ -3174,7 +3182,7 @@ tcache_bin_fill(tcache_t *tcache, tcache_bin_t *tbin, size_t binind)
arena = tcache->arena; arena = tcache->arena;
bin = &arena->bins[binind]; bin = &arena->bins[binind];
malloc_mutex_lock(&arena->lock); malloc_mutex_lock(&arena->lock);
for (i = 0; i < (TCACHE_NSLOTS >> 1); i++) { for (i = 0; i < (tcache_nslots >> 1); i++) {
if ((run = bin->runcur) != NULL && run->nfree > 0) if ((run = bin->runcur) != NULL && run->nfree > 0)
ptr = arena_bin_malloc_easy(arena, bin, run); ptr = arena_bin_malloc_easy(arena, bin, run);
else else
@ -3185,7 +3193,7 @@ tcache_bin_fill(tcache_t *tcache, tcache_bin_t *tbin, size_t binind)
* Fill tbin such that the objects lowest in memory are used * Fill tbin such that the objects lowest in memory are used
* first. * first.
*/ */
tbin->slots[(TCACHE_NSLOTS >> 1) - 1 - i] = ptr; tbin->slots[(tcache_nslots >> 1) - 1 - i] = ptr;
} }
#ifdef JEMALLOC_STATS #ifdef JEMALLOC_STATS
bin->stats.nfills++; bin->stats.nfills++;
@ -3384,12 +3392,12 @@ arena_malloc_large(arena_t *arena, size_t size, bool zero)
#ifdef JEMALLOC_STATS #ifdef JEMALLOC_STATS
arena->stats.nmalloc_large++; arena->stats.nmalloc_large++;
arena->stats.allocated_large += size; arena->stats.allocated_large += size;
arena->stats.lstats[size >> PAGE_SHIFT].nrequests++; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].nrequests++;
arena->stats.lstats[size >> PAGE_SHIFT].curruns++; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns++;
if (arena->stats.lstats[size >> PAGE_SHIFT].curruns > if (arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns >
arena->stats.lstats[size >> PAGE_SHIFT].highruns) { arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns) {
arena->stats.lstats[size >> PAGE_SHIFT].highruns = arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns =
arena->stats.lstats[size >> PAGE_SHIFT].curruns; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns;
} }
#endif #endif
malloc_mutex_unlock(&arena->lock); malloc_mutex_unlock(&arena->lock);
@ -3415,7 +3423,7 @@ arena_malloc(size_t size, bool zero)
if (size <= bin_maxclass) { if (size <= bin_maxclass) {
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (isthreaded && opt_tcache) { if (isthreaded && tcache_nslots) {
tcache_t *tcache = tcache_tls; tcache_t *tcache = tcache_tls;
if (tcache == NULL) { if (tcache == NULL) {
tcache = tcache_create(choose_arena()); tcache = tcache_create(choose_arena());
@ -3508,12 +3516,12 @@ arena_palloc(arena_t *arena, size_t alignment, size_t size, size_t alloc_size)
#ifdef JEMALLOC_STATS #ifdef JEMALLOC_STATS
arena->stats.nmalloc_large++; arena->stats.nmalloc_large++;
arena->stats.allocated_large += size; arena->stats.allocated_large += size;
arena->stats.lstats[size >> PAGE_SHIFT].nrequests++; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].nrequests++;
arena->stats.lstats[size >> PAGE_SHIFT].curruns++; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns++;
if (arena->stats.lstats[size >> PAGE_SHIFT].curruns > if (arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns >
arena->stats.lstats[size >> PAGE_SHIFT].highruns) { arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns) {
arena->stats.lstats[size >> PAGE_SHIFT].highruns = arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns =
arena->stats.lstats[size >> PAGE_SHIFT].curruns; arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns;
} }
#endif #endif
malloc_mutex_unlock(&arena->lock); malloc_mutex_unlock(&arena->lock);
@ -4013,7 +4021,7 @@ tcache_bin_sort(tcache_bin_t *tbin)
{ {
unsigned e, i; unsigned e, i;
void **fr, **to; void **fr, **to;
void *mslots[TCACHE_NSLOTS]; void *mslots[tcache_nslots];
/* /*
* Perform iterative merge sort, swapping source and destination arrays * Perform iterative merge sort, swapping source and destination arrays
@ -4153,9 +4161,9 @@ tcache_dalloc(tcache_t *tcache, void *ptr)
tcache->tbins[binind] = tbin; tcache->tbins[binind] = tbin;
} }
if (tbin->ncached == TCACHE_NSLOTS) if (tbin->ncached == tcache_nslots)
tcache_bin_flush(tbin, binind, (TCACHE_NSLOTS >> 1)); tcache_bin_flush(tbin, binind, (tcache_nslots >> 1));
assert(tbin->ncached < TCACHE_NSLOTS); assert(tbin->ncached < tcache_nslots);
tbin->slots[tbin->ncached] = ptr; tbin->slots[tbin->ncached] = ptr;
tbin->ncached++; tbin->ncached++;
if (tbin->ncached > tbin->high_water) if (tbin->ncached > tbin->high_water)
@ -4220,7 +4228,7 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) { if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) {
/* Small allocation. */ /* Small allocation. */
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (isthreaded && opt_tcache) { if (isthreaded && tcache_nslots) {
tcache_t *tcache = tcache_tls; tcache_t *tcache = tcache_tls;
if ((uintptr_t)tcache > (uintptr_t)1) if ((uintptr_t)tcache > (uintptr_t)1)
tcache_dalloc(tcache, ptr); tcache_dalloc(tcache, ptr);
@ -4701,15 +4709,15 @@ static tcache_bin_t *
tcache_bin_create(arena_t *arena) tcache_bin_create(arena_t *arena)
{ {
tcache_bin_t *ret; tcache_bin_t *ret;
size_t tsize;
if (sizeof(tcache_bin_t) <= small_maxclass) { tsize = sizeof(tcache_bin_t) + (sizeof(void *) * (tcache_nslots - 1));
ret = (tcache_bin_t *)arena_malloc_small(arena, if (tsize <= small_maxclass)
sizeof(tcache_bin_t), false); ret = (tcache_bin_t *)arena_malloc_small(arena, tsize, false);
} else if (sizeof(tcache_bin_t) <= bin_maxclass) { else if (tsize <= bin_maxclass)
ret = (tcache_bin_t *)arena_malloc_medium(arena, ret = (tcache_bin_t *)arena_malloc_medium(arena, tsize, false);
sizeof(tcache_bin_t), false); else
} else ret = (tcache_bin_t *)imalloc(tsize);
ret = imalloc(sizeof(tcache_bin_t));
if (ret == NULL) if (ret == NULL)
return (NULL); return (NULL);
#ifdef JEMALLOC_STATS #ifdef JEMALLOC_STATS
@ -4727,7 +4735,7 @@ tcache_bin_destroy(tcache_t *tcache, tcache_bin_t *tbin, unsigned binind)
{ {
arena_t *arena; arena_t *arena;
arena_chunk_t *chunk; arena_chunk_t *chunk;
size_t pageind; size_t pageind, tsize;
arena_chunk_map_t *mapelm; arena_chunk_map_t *mapelm;
chunk = CHUNK_ADDR2BASE(tbin); chunk = CHUNK_ADDR2BASE(tbin);
@ -4750,7 +4758,8 @@ tcache_bin_destroy(tcache_t *tcache, tcache_bin_t *tbin, unsigned binind)
#endif #endif
assert(tbin->ncached == 0); assert(tbin->ncached == 0);
if (sizeof(tcache_bin_t) <= bin_maxclass) { tsize = sizeof(tcache_bin_t) + (sizeof(void *) * (tcache_nslots - 1));
if (tsize <= bin_maxclass) {
malloc_mutex_lock(&arena->lock); malloc_mutex_lock(&arena->lock);
arena_dalloc_bin(arena, chunk, tbin, mapelm); arena_dalloc_bin(arena, chunk, tbin, mapelm);
malloc_mutex_unlock(&arena->lock); malloc_mutex_unlock(&arena->lock);
@ -5622,10 +5631,13 @@ MALLOC_OUT:
opt_lg_tcache_gc_sweep++; opt_lg_tcache_gc_sweep++;
break; break;
case 'h': case 'h':
opt_tcache = false; if (opt_lg_tcache_nslots > 0)
opt_lg_tcache_nslots--;
break; break;
case 'H': case 'H':
opt_tcache = true; if (opt_lg_tcache_nslots + 1 <
(sizeof(size_t) << 3))
opt_lg_tcache_nslots++;
break; break;
#endif #endif
#ifdef JEMALLOC_FILL #ifdef JEMALLOC_FILL
@ -5810,13 +5822,18 @@ MALLOC_OUT:
} }
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (opt_lg_tcache_nslots > 0) {
tcache_nslots = (1U << opt_lg_tcache_nslots);
/* Compute incremental GC event threshold. */ /* Compute incremental GC event threshold. */
if (opt_lg_tcache_gc_sweep >= 0) { if (opt_lg_tcache_gc_sweep >= 0) {
tcache_gc_incr = ((1U << opt_lg_tcache_gc_sweep) / tcache_gc_incr = ((1U << opt_lg_tcache_gc_sweep) /
nbins) + (((1U << opt_lg_tcache_gc_sweep) % nbins == 0) nbins) + (((1U << opt_lg_tcache_gc_sweep) % nbins ==
? 0 : 1); 0) ? 0 : 1);
} else } else
tcache_gc_incr = 0; tcache_gc_incr = 0;
} else
tcache_nslots = 0;
#endif #endif
/* Set variables according to the value of opt_lg_chunk. */ /* Set variables according to the value of opt_lg_chunk. */
@ -5914,7 +5931,7 @@ MALLOC_OUT:
#endif #endif
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (opt_tcache) { if (tcache_nslots) {
if (pthread_key_create(&tcache_tsd, tcache_thread_cleanup) != if (pthread_key_create(&tcache_tsd, tcache_thread_cleanup) !=
0) { 0) {
malloc_message("<jemalloc>", malloc_message("<jemalloc>",
@ -5938,7 +5955,7 @@ MALLOC_OUT:
* default. * default.
*/ */
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (opt_tcache) { if (tcache_nslots) {
/* /*
* Only large object allocation/deallocation is * Only large object allocation/deallocation is
* guaranteed to acquire an arena mutex, so we can get * guaranteed to acquire an arena mutex, so we can get
@ -6397,9 +6414,6 @@ malloc_stats_print(const char *opts)
"\n", ""); "\n", "");
malloc_message("Boolean JEMALLOC_OPTIONS: ", malloc_message("Boolean JEMALLOC_OPTIONS: ",
opt_abort ? "A" : "a", "", ""); opt_abort ? "A" : "a", "", "");
#ifdef JEMALLOC_TCACHE
malloc_message(opt_tcache ? "H" : "h", "", "", "");
#endif
#ifdef JEMALLOC_FILL #ifdef JEMALLOC_FILL
malloc_message(opt_junk ? "J" : "j", "", "", ""); malloc_message(opt_junk ? "J" : "j", "", "", "");
#endif #endif
@ -6459,18 +6473,17 @@ malloc_stats_print(const char *opts)
"", "", ""); "", "", "");
} }
#ifdef JEMALLOC_TCACHE #ifdef JEMALLOC_TCACHE
if (opt_tcache) { malloc_message("Thread cache slots per size class: ",
tcache_nslots ? umax2s(tcache_nslots, 10, s) : "N/A",
"\n", "");
malloc_message("Thread cache GC sweep interval: ", malloc_message("Thread cache GC sweep interval: ",
(tcache_gc_incr > 0) ? (tcache_nslots && tcache_gc_incr > 0) ?
umax2s((1U << opt_lg_tcache_gc_sweep), 10, s) umax2s((1U << opt_lg_tcache_gc_sweep), 10, s) : "N/A",
: "N/A",
"", ""); "", "");
malloc_message(" (increment interval: ", malloc_message(" (increment interval: ",
(tcache_gc_incr > 0) ? (tcache_nslots && tcache_gc_incr > 0) ?
umax2s(tcache_gc_incr, 10, s) umax2s(tcache_gc_incr, 10, s) : "N/A",
: "N/A",
")\n", ""); ")\n", "");
}
#endif #endif
malloc_message("Chunk size: ", umax2s(chunksize, 10, s), "", malloc_message("Chunk size: ", umax2s(chunksize, 10, s), "",
""); "");