Enhance the H/h MALLOC_OPTIONS flags to control the number of tcache bin slots,
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
parent
3f3ecfb8e8
commit
279e09d1ff
@ -254,15 +254,21 @@ will disable dirty page purging.
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@roff_tcache@.Ev JEMALLOC_OPTIONS=14g
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@roff_tcache@will disable garbage collection.
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@roff_tcache@.It H
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@roff_tcache@When there are multiple threads, use thread-specific caching for
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@roff_tcache@small and medium objects.
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@roff_tcache@This option is enabled by default.
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@roff_tcache@Double/halve the number of thread-specific cache slots per size
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@roff_tcache@class.
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@roff_tcache@When there are multiple threads, each thread uses a
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@roff_tcache@thread-specific cache for small and medium objects.
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@roff_tcache@Thread-specific caching allows many allocations to be satisfied
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@roff_tcache@without performing any thread synchronization, at the cost of
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@roff_tcache@increased memory use.
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@roff_tcache@See the
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@roff_tcache@.Dq G
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@roff_tcache@option for related tuning information.
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@roff_tcache@The default number of cache slots is 128;
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@roff_tcache@.Ev JEMALLOC_OPTIONS=7h
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@roff_tcache@will disable thread-specific caching.
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@roff_tcache@Note that one cache slot per size class is not a valid
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@roff_tcache@configuration due to implementation details.
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@roff_fill@.It J
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@roff_fill@Each byte of new memory allocated by
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@roff_fill@.Fn @jemalloc_prefix@malloc
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@ -272,9 +272,11 @@ __FBSDID("$FreeBSD: src/lib/libc/stdlib/malloc.c,v 1.183 2008/12/01 10:20:59 jas
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PAGE_SHIFT)))
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#ifdef JEMALLOC_TCACHE
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/* Number of cache slots for each bin in the thread cache. */
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# define TCACHE_LG_NSLOTS 7
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# define TCACHE_NSLOTS (1U << TCACHE_LG_NSLOTS)
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/*
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* Default number of cache slots for each bin in the thread cache (0:
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* disabled).
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*/
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# define LG_TCACHE_NSLOTS_DEFAULT 7
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/*
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* (1U << opt_lg_tcache_gc_sweep) is the approximate number of
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* allocation events between full GC sweeps (-1: disabled). Integer
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@ -721,7 +723,7 @@ struct tcache_bin_s {
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unsigned low_water; /* Min # cached since last GC. */
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unsigned high_water; /* Max # cached since last GC. */
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unsigned ncached; /* # of cached objects. */
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void *slots[TCACHE_NSLOTS];
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void *slots[1]; /* Dynamically sized. */
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};
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struct tcache_s {
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@ -1038,6 +1040,12 @@ static __thread tcache_t *tcache_tls
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*/
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static pthread_key_t tcache_tsd;
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/*
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* Number of cache slots for each bin in the thread cache, or 0 if tcache is
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* disabled.
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*/
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size_t tcache_nslots;
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/* Number of tcache allocation/deallocation events between incremental GCs. */
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unsigned tcache_gc_incr;
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#endif
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@ -1080,7 +1088,7 @@ static bool opt_junk = false;
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# endif
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#endif
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#ifdef JEMALLOC_TCACHE
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static bool opt_tcache = true;
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static size_t opt_lg_tcache_nslots = LG_TCACHE_NSLOTS_DEFAULT;
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static ssize_t opt_lg_tcache_gc_sweep = LG_TCACHE_GC_SWEEP_DEFAULT;
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#endif
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static ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT;
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@ -3174,7 +3182,7 @@ tcache_bin_fill(tcache_t *tcache, tcache_bin_t *tbin, size_t binind)
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arena = tcache->arena;
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bin = &arena->bins[binind];
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malloc_mutex_lock(&arena->lock);
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for (i = 0; i < (TCACHE_NSLOTS >> 1); i++) {
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for (i = 0; i < (tcache_nslots >> 1); i++) {
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if ((run = bin->runcur) != NULL && run->nfree > 0)
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ptr = arena_bin_malloc_easy(arena, bin, run);
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else
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@ -3185,7 +3193,7 @@ tcache_bin_fill(tcache_t *tcache, tcache_bin_t *tbin, size_t binind)
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* Fill tbin such that the objects lowest in memory are used
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* first.
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*/
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tbin->slots[(TCACHE_NSLOTS >> 1) - 1 - i] = ptr;
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tbin->slots[(tcache_nslots >> 1) - 1 - i] = ptr;
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}
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#ifdef JEMALLOC_STATS
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bin->stats.nfills++;
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@ -3384,12 +3392,12 @@ arena_malloc_large(arena_t *arena, size_t size, bool zero)
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#ifdef JEMALLOC_STATS
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arena->stats.nmalloc_large++;
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arena->stats.allocated_large += size;
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arena->stats.lstats[size >> PAGE_SHIFT].nrequests++;
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arena->stats.lstats[size >> PAGE_SHIFT].curruns++;
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if (arena->stats.lstats[size >> PAGE_SHIFT].curruns >
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arena->stats.lstats[size >> PAGE_SHIFT].highruns) {
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arena->stats.lstats[size >> PAGE_SHIFT].highruns =
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arena->stats.lstats[size >> PAGE_SHIFT].curruns;
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].nrequests++;
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns++;
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if (arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns >
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns) {
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns =
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns;
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}
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#endif
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malloc_mutex_unlock(&arena->lock);
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@ -3415,7 +3423,7 @@ arena_malloc(size_t size, bool zero)
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if (size <= bin_maxclass) {
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#ifdef JEMALLOC_TCACHE
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if (isthreaded && opt_tcache) {
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if (isthreaded && tcache_nslots) {
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tcache_t *tcache = tcache_tls;
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if (tcache == NULL) {
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tcache = tcache_create(choose_arena());
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@ -3508,12 +3516,12 @@ arena_palloc(arena_t *arena, size_t alignment, size_t size, size_t alloc_size)
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#ifdef JEMALLOC_STATS
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arena->stats.nmalloc_large++;
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arena->stats.allocated_large += size;
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arena->stats.lstats[size >> PAGE_SHIFT].nrequests++;
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arena->stats.lstats[size >> PAGE_SHIFT].curruns++;
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if (arena->stats.lstats[size >> PAGE_SHIFT].curruns >
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arena->stats.lstats[size >> PAGE_SHIFT].highruns) {
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arena->stats.lstats[size >> PAGE_SHIFT].highruns =
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arena->stats.lstats[size >> PAGE_SHIFT].curruns;
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].nrequests++;
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns++;
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if (arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns >
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns) {
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].highruns =
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arena->stats.lstats[(size >> PAGE_SHIFT) - 1].curruns;
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}
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#endif
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malloc_mutex_unlock(&arena->lock);
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@ -4013,7 +4021,7 @@ tcache_bin_sort(tcache_bin_t *tbin)
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{
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unsigned e, i;
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void **fr, **to;
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void *mslots[TCACHE_NSLOTS];
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void *mslots[tcache_nslots];
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/*
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* Perform iterative merge sort, swapping source and destination arrays
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@ -4153,9 +4161,9 @@ tcache_dalloc(tcache_t *tcache, void *ptr)
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tcache->tbins[binind] = tbin;
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}
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if (tbin->ncached == TCACHE_NSLOTS)
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tcache_bin_flush(tbin, binind, (TCACHE_NSLOTS >> 1));
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assert(tbin->ncached < TCACHE_NSLOTS);
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if (tbin->ncached == tcache_nslots)
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tcache_bin_flush(tbin, binind, (tcache_nslots >> 1));
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assert(tbin->ncached < tcache_nslots);
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tbin->slots[tbin->ncached] = ptr;
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tbin->ncached++;
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if (tbin->ncached > tbin->high_water)
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@ -4220,7 +4228,7 @@ arena_dalloc(arena_t *arena, arena_chunk_t *chunk, void *ptr)
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if ((mapelm->bits & CHUNK_MAP_LARGE) == 0) {
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/* Small allocation. */
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#ifdef JEMALLOC_TCACHE
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if (isthreaded && opt_tcache) {
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if (isthreaded && tcache_nslots) {
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tcache_t *tcache = tcache_tls;
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if ((uintptr_t)tcache > (uintptr_t)1)
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tcache_dalloc(tcache, ptr);
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@ -4701,15 +4709,15 @@ static tcache_bin_t *
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tcache_bin_create(arena_t *arena)
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{
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tcache_bin_t *ret;
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size_t tsize;
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if (sizeof(tcache_bin_t) <= small_maxclass) {
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ret = (tcache_bin_t *)arena_malloc_small(arena,
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sizeof(tcache_bin_t), false);
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} else if (sizeof(tcache_bin_t) <= bin_maxclass) {
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ret = (tcache_bin_t *)arena_malloc_medium(arena,
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sizeof(tcache_bin_t), false);
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} else
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ret = imalloc(sizeof(tcache_bin_t));
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tsize = sizeof(tcache_bin_t) + (sizeof(void *) * (tcache_nslots - 1));
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if (tsize <= small_maxclass)
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ret = (tcache_bin_t *)arena_malloc_small(arena, tsize, false);
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else if (tsize <= bin_maxclass)
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ret = (tcache_bin_t *)arena_malloc_medium(arena, tsize, false);
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else
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ret = (tcache_bin_t *)imalloc(tsize);
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if (ret == NULL)
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return (NULL);
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#ifdef JEMALLOC_STATS
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@ -4727,7 +4735,7 @@ tcache_bin_destroy(tcache_t *tcache, tcache_bin_t *tbin, unsigned binind)
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{
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arena_t *arena;
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arena_chunk_t *chunk;
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size_t pageind;
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size_t pageind, tsize;
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arena_chunk_map_t *mapelm;
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chunk = CHUNK_ADDR2BASE(tbin);
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@ -4750,7 +4758,8 @@ tcache_bin_destroy(tcache_t *tcache, tcache_bin_t *tbin, unsigned binind)
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#endif
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assert(tbin->ncached == 0);
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if (sizeof(tcache_bin_t) <= bin_maxclass) {
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tsize = sizeof(tcache_bin_t) + (sizeof(void *) * (tcache_nslots - 1));
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if (tsize <= bin_maxclass) {
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malloc_mutex_lock(&arena->lock);
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arena_dalloc_bin(arena, chunk, tbin, mapelm);
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malloc_mutex_unlock(&arena->lock);
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@ -5622,10 +5631,13 @@ MALLOC_OUT:
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opt_lg_tcache_gc_sweep++;
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break;
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case 'h':
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opt_tcache = false;
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if (opt_lg_tcache_nslots > 0)
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opt_lg_tcache_nslots--;
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break;
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case 'H':
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opt_tcache = true;
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if (opt_lg_tcache_nslots + 1 <
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(sizeof(size_t) << 3))
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opt_lg_tcache_nslots++;
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break;
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#endif
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#ifdef JEMALLOC_FILL
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@ -5810,13 +5822,18 @@ MALLOC_OUT:
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}
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#ifdef JEMALLOC_TCACHE
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/* Compute incremental GC event threshold. */
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if (opt_lg_tcache_gc_sweep >= 0) {
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tcache_gc_incr = ((1U << opt_lg_tcache_gc_sweep) /
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nbins) + (((1U << opt_lg_tcache_gc_sweep) % nbins == 0)
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? 0 : 1);
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if (opt_lg_tcache_nslots > 0) {
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tcache_nslots = (1U << opt_lg_tcache_nslots);
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/* Compute incremental GC event threshold. */
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if (opt_lg_tcache_gc_sweep >= 0) {
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tcache_gc_incr = ((1U << opt_lg_tcache_gc_sweep) /
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nbins) + (((1U << opt_lg_tcache_gc_sweep) % nbins ==
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0) ? 0 : 1);
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} else
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tcache_gc_incr = 0;
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} else
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tcache_gc_incr = 0;
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tcache_nslots = 0;
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#endif
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/* Set variables according to the value of opt_lg_chunk. */
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@ -5914,7 +5931,7 @@ MALLOC_OUT:
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#endif
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#ifdef JEMALLOC_TCACHE
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if (opt_tcache) {
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if (tcache_nslots) {
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if (pthread_key_create(&tcache_tsd, tcache_thread_cleanup) !=
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0) {
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malloc_message("<jemalloc>",
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@ -5938,7 +5955,7 @@ MALLOC_OUT:
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* default.
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*/
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#ifdef JEMALLOC_TCACHE
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if (opt_tcache) {
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if (tcache_nslots) {
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/*
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* Only large object allocation/deallocation is
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* guaranteed to acquire an arena mutex, so we can get
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@ -6397,9 +6414,6 @@ malloc_stats_print(const char *opts)
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"\n", "");
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malloc_message("Boolean JEMALLOC_OPTIONS: ",
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opt_abort ? "A" : "a", "", "");
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#ifdef JEMALLOC_TCACHE
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malloc_message(opt_tcache ? "H" : "h", "", "", "");
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#endif
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#ifdef JEMALLOC_FILL
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malloc_message(opt_junk ? "J" : "j", "", "", "");
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#endif
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@ -6459,18 +6473,17 @@ malloc_stats_print(const char *opts)
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"", "", "");
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}
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#ifdef JEMALLOC_TCACHE
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if (opt_tcache) {
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malloc_message("Thread cache GC sweep interval: ",
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(tcache_gc_incr > 0) ?
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umax2s((1U << opt_lg_tcache_gc_sweep), 10, s)
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: "N/A",
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"", "");
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malloc_message(" (increment interval: ",
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(tcache_gc_incr > 0) ?
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umax2s(tcache_gc_incr, 10, s)
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: "N/A",
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")\n", "");
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}
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malloc_message("Thread cache slots per size class: ",
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tcache_nslots ? umax2s(tcache_nslots, 10, s) : "N/A",
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"\n", "");
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malloc_message("Thread cache GC sweep interval: ",
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(tcache_nslots && tcache_gc_incr > 0) ?
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umax2s((1U << opt_lg_tcache_gc_sweep), 10, s) : "N/A",
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"", "");
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malloc_message(" (increment interval: ",
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(tcache_nslots && tcache_gc_incr > 0) ?
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umax2s(tcache_gc_incr, 10, s) : "N/A",
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")\n", "");
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#endif
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malloc_message("Chunk size: ", umax2s(chunksize, 10, s), "",
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"");
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