project-base/server-skynet-source-3rd-jemalloc
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Use any-best-fit for cached extent allocation.

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This simplifies what would be pairing heap operations to the equivalent
of LIFO queue operations.  This is a complementary optimization in the
context of delayed coalescing for cached extents.
This commit is contained in:
Jason Evans 2017-03-03 22:55:28 -08:00
parent cc75c35db5
commit cdce93e4a3
1 changed files with 8 additions and 5 deletions
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13
src/extent.c
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@ -238,17 +238,20 @@ extents_remove_locked(tsdn_t *tsdn, extents_t *extents, extent_t *extent,
} }
/* /*
* Do first-best-fit extent selection, i.e. select the oldest/lowest extent that * Do {first,any}-best-fit extent selection, i.e. select the oldest/lowest or
* best fits. * any extent that best fits, where {first,any} corresponds to
* extents->delay_coalesce={false,true}.
*/ */
static extent_t * static extent_t *
extents_first_best_fit_locked(tsdn_t *tsdn, arena_t *arena, extents_t *extents, extents_best_fit_locked(tsdn_t *tsdn, arena_t *arena, extents_t *extents,
size_t size) { size_t size) {
malloc_mutex_assert_owner(tsdn, &extents->mtx); malloc_mutex_assert_owner(tsdn, &extents->mtx);
pszind_t pind = psz2ind(extent_size_quantize_ceil(size)); pszind_t pind = psz2ind(extent_size_quantize_ceil(size));
for (pszind_t i = pind; i < NPSIZES+1; i++) { for (pszind_t i = pind; i < NPSIZES+1; i++) {
extent_t *extent = extent_heap_first(&extents->heaps[i]); extent_t *extent = extents->delay_coalesce ?
extent_heap_any(&extents->heaps[i]) :
extent_heap_first(&extents->heaps[i]);
if (extent != NULL) { if (extent != NULL) {
assert(extent_size_get(extent) >= size); assert(extent_size_get(extent) >= size);
return extent; return extent;
@ -620,7 +623,7 @@ extent_recycle_extract(tsdn_t *tsdn, arena_t *arena,
extent = NULL; extent = NULL;
} }
} else { } else {
extent = extents_first_best_fit_locked(tsdn, arena, extents, extent = extents_best_fit_locked(tsdn, arena, extents,
alloc_size); alloc_size);
} }
if (extent == NULL) { if (extent == NULL) {