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Decay: Add comments for the public API.

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David Goldblatt 2020-03-09 18:37:23 -07:00 committed by David Goldblatt
parent 8f2193dc8d
commit cdb916ed3f
1 changed files with 18 additions and 0 deletions
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18
include/jemalloc/internal/decay.h
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@ -81,11 +81,19 @@ struct decay_s {
uint64_t ceil_npages; uint64_t ceil_npages;
}; };
/*
* The current decay time setting. This is the only public access to a decay_t
* that's allowed without holding mtx.
*/
static inline ssize_t static inline ssize_t
decay_ms_read(const decay_t *decay) { decay_ms_read(const decay_t *decay) {
return atomic_load_zd(&decay->time_ms, ATOMIC_RELAXED); return atomic_load_zd(&decay->time_ms, ATOMIC_RELAXED);
} }
/*
* See the comment on the struct field -- the limit on pages we should allow in
* this decay state this epoch.
*/
static inline size_t static inline size_t
decay_npages_limit_get(const decay_t *decay) { decay_npages_limit_get(const decay_t *decay) {
return decay->npages_limit; return decay->npages_limit;
@ -97,6 +105,16 @@ decay_epoch_npages_delta(const decay_t *decay) {
return decay->backlog[SMOOTHSTEP_NSTEPS - 1]; return decay->backlog[SMOOTHSTEP_NSTEPS - 1];
} }
/*
* Returns true if the passed in decay time setting is valid.
* < -1 : invalid
* -1 : never decay
* 0 : decay immediately
* > 0 : some positive decay time, up to a maximum allowed value of
* NSTIME_SEC_MAX * 1000, which corresponds to decaying somewhere in the early
* 27th century. By that time, we expect to have implemented alternate purging
* strategies.
*/
bool decay_ms_valid(ssize_t decay_ms); bool decay_ms_valid(ssize_t decay_ms);
/* /*