Cache an arena's index in the arena.

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

View File

@ -3,7 +3,7 @@
static inline unsigned
arena_ind_get(const arena_t *arena) {
return base_ind_get(arena->base);
return arena->ind;
}
static inline void

View File

@ -83,6 +83,12 @@ struct arena_s {
*/
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.
*

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