project-base/server-skynet-source-3rd-jemalloc
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Cache an arena's index in the arena.

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This saves us a pointer hop down some perf-sensitive paths.
This commit is contained in:
David Goldblatt 2021-01-29 21:22:57 -08:00 committed by David Goldblatt
parent 229994a204
commit 4c46e11365
3 changed files with 8 additions and 1 deletions
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2
include/jemalloc/internal/arena_inlines_a.h
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@ -3,7 +3,7 @@
static inline unsigned static inline unsigned
arena_ind_get(const arena_t *arena) { arena_ind_get(const arena_t *arena) {
return base_ind_get(arena->base); return arena->ind;
} }
static inline void static inline void

6
include/jemalloc/internal/arena_structs.h
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@ -83,6 +83,12 @@ struct arena_s {
*/ */
bins_t bins[SC_NBINS]; bins_t bins[SC_NBINS];
/*
* A cached copy of base->ind. This can get accessed on hot paths;
* looking it up in base requires an extra pointer hop / cache miss.
*/
unsigned ind;
/* /*
* Base allocator, from which arena metadata are allocated. * Base allocator, from which arena metadata are allocated.
* *

1
src/arena.c
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@ -1475,6 +1475,7 @@ arena_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
arena->base = base; arena->base = base;
/* Set arena before creating background threads. */ /* Set arena before creating background threads. */
arena_set(ind, arena); arena_set(ind, arena);
arena->ind = ind;
nstime_init_update(&arena->create_time); nstime_init_update(&arena->create_time);