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Only read arena index from extent on the tcache flush path.

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Add exten_arena_ind_get() to avoid loading the actual arena ptr in case we just
need to check arena matching.
This commit is contained in:
Qi Wang
2018-12-03 18:30:58 -08:00
committed by Qi Wang
parent 441335d924
commit 7241bf5b74
2 changed files with 19 additions and 14 deletions
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19
include/jemalloc/internal/extent_inlines.h
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@@ -35,18 +35,19 @@ extent_unlock2(tsdn_t *tsdn, extent_t *extent1, extent_t *extent2) {
(uintptr_t)extent2);
}
static inline arena_t *
extent_arena_get(const extent_t *extent) {
static inline unsigned
extent_arena_ind_get(const extent_t *extent) {
unsigned arena_ind = (unsigned)((extent->e_bits &
EXTENT_BITS_ARENA_MASK) >> EXTENT_BITS_ARENA_SHIFT);
/*
* The following check is omitted because we should never actually read
* a NULL arena pointer.
*/
if (false && arena_ind >= MALLOCX_ARENA_LIMIT) {
return NULL;
}
assert(arena_ind < MALLOCX_ARENA_LIMIT);
return arena_ind;
}
static inline arena_t *
extent_arena_get(const extent_t *extent) {
unsigned arena_ind = extent_arena_ind_get(extent);
return (arena_t *)atomic_load_p(&arenas[arena_ind], ATOMIC_ACQUIRE);
}