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Edata cache: add edata_cache_small_t.

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This can be used to amortize the synchronization costs of edata_cache accesses.
This commit is contained in:
David Goldblatt
2020-02-18 17:21:40 -08:00
committed by David Goldblatt
parent 734109d9c2
commit 99b1291d17
3 changed files with 134 additions and 15 deletions
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28
include/jemalloc/internal/edata_cache.h
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@@ -25,4 +25,32 @@ void edata_cache_prefork(tsdn_t *tsdn, edata_cache_t *edata_cache);
void edata_cache_postfork_parent(tsdn_t *tsdn, edata_cache_t *edata_cache);
void edata_cache_postfork_child(tsdn_t *tsdn, edata_cache_t *edata_cache);
typedef struct edata_cache_small_s edata_cache_small_t;
struct edata_cache_small_s {
edata_list_t list;
size_t count;
edata_cache_t *fallback;
};
/*
* An edata_cache_small is like an edata_cache, but it relies on external
* synchronization and avoids first-fit strategies. You can call "prepare" to
* acquire at least num edata_t objects, and then "finish" to flush all
* excess ones back to their fallback edata_cache_t. Once they have been
* acquired, they can be allocated without failing (and in fact, this is
* required -- it's not permitted to attempt to get an edata_t without first
* preparing for it).
*/
void edata_cache_small_init(edata_cache_small_t *ecs, edata_cache_t *fallback);
/* Returns whether or not an error occurred. */
bool edata_cache_small_prepare(tsdn_t *tsdn, edata_cache_small_t *ecs,
size_t num);
edata_t *edata_cache_small_get(edata_cache_small_t *ecs);
void edata_cache_small_put(edata_cache_small_t *ecs, edata_t *edata);
void edata_cache_small_finish(tsdn_t *tsdn, edata_cache_small_t *ecs,
size_t num);
#endif /* JEMALLOC_INTERNAL_EDATA_CACHE_H */