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Route batch allocation of small batch size to tcache

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This commit is contained in:
Yinan Zhang 2020-11-12 14:54:25 -08:00
parent ac480136d7
commit d96e4525ad
2 changed files with 91 additions and 91 deletions
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106
src/jemalloc.c
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@ -4088,32 +4088,15 @@ batch_alloc(void **ptrs, size_t num, size_t size, int flags) {
if (aligned_usize_get(size, alignment, &usize, NULL, false)) {
goto label_done;
}
szind_t ind = sz_size2index(usize);
if (unlikely(ind >= SC_NBINS)) {
/* No optimization for large sizes. */
void *p;
while (filled < num && (p = je_mallocx(size, flags)) != NULL) {
ptrs[filled++] = p;
}
goto label_done;
}
bool zero = zero_get(MALLOCX_ZERO_GET(flags), /* slow */ true);
unsigned arena_ind = mallocx_arena_get(flags);
arena_t *arena;
if (arena_get_from_ind(tsd, arena_ind, &arena)) {
goto label_done;
}
if (arena == NULL) {
arena = arena_choose(tsd, NULL);
} else {
/* When a manual arena is specified, bypass the tcache. */
flags |= MALLOCX_TCACHE_NONE;
}
if (unlikely(arena == NULL)) {
goto label_done;
cache_bin_t *bin = NULL;
arena_t *arena = NULL;
size_t nregs = 0;
if (likely(ind < SC_NBINS)) {
nregs = bin_infos[ind].nregs;
assert(nregs > 0);
}
while (filled < num) {
@ -4132,9 +4115,63 @@ batch_alloc(void **ptrs, size_t num, size_t size, int flags) {
batch_alloc_prof_sample_assert(tsd, batch, usize);
}
size_t n = arena_fill_small_fresh(tsd_tsdn(tsd), arena,
ind, ptrs + filled, batch, zero);
filled += n;
size_t progress = 0;
if (likely(ind < SC_NBINS) && batch >= nregs) {
if (arena == NULL) {
unsigned arena_ind = mallocx_arena_get(flags);
if (arena_get_from_ind(tsd, arena_ind,
&arena)) {
goto label_done;
}
if (arena == NULL) {
arena = arena_choose(tsd, NULL);
}
if (unlikely(arena == NULL)) {
goto label_done;
}
}
size_t arena_batch = batch - batch % nregs;
size_t n = arena_fill_small_fresh(tsd_tsdn(tsd), arena,
ind, ptrs + filled, arena_batch, zero);
progress += n;
filled += n;
}
if (likely(ind < nhbins) && progress < batch) {
if (bin == NULL) {
unsigned tcache_ind = mallocx_tcache_get(flags);
tcache_t *tcache = tcache_get_from_ind(tsd,
tcache_ind, /* slow */ true,
/* is_alloc */ true);
if (tcache != NULL) {
bin = &tcache->bins[ind];
}
}
if (bin != NULL) {
size_t bin_batch = batch - progress;
size_t n = cache_bin_alloc_batch(bin, bin_batch,
ptrs + filled);
if (config_stats) {
bin->tstats.nrequests += n;
}
if (zero) {
for (size_t i = 0; i < n; ++i) {
memset(ptrs[filled + i], 0,
usize);
}
}
if (config_prof && opt_prof
&& unlikely(ind >= SC_NBINS)) {
for (size_t i = 0; i < n; ++i) {
prof_tctx_reset_sampled(tsd,
ptrs[filled + i]);
}
}
progress += n;
filled += n;
}
}
/*
* For thread events other than prof sampling, trigger them as
@ -4146,23 +4183,16 @@ batch_alloc(void **ptrs, size_t num, size_t size, int flags) {
* were handled individually, but it would do no harm (or
* even be beneficial) to coalesce the triggerings.
*/
thread_alloc_event(tsd, n * usize);
thread_alloc_event(tsd, progress * usize);
if (n < batch) { /* OOM */
break;
}
if (prof_sample_event) {
/*
* The next allocation will be prof sampled. The
* thread event logic is handled within the mallocx()
* call.
*/
if (progress < batch || prof_sample_event) {
void *p = je_mallocx(size, flags);
if (p == NULL) { /* OOM */
break;
}
assert(prof_sampled(tsd, p));
if (progress == batch) {
assert(prof_sampled(tsd, p));
}
ptrs[filled++] = p;
}
}