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Extract out per event new wait time fetching

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This commit is contained in:
Yinan Zhang 2020-04-15 10:49:08 -07:00
parent 1e2524e15a
commit 733ae918f0
7 changed files with 48 additions and 21 deletions
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17
src/prof.c
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@ -518,16 +518,11 @@ prof_backtrace(tsd_t *tsd, prof_bt_t *bt) {
* (e.g.
* -mno-sse) in order for the workaround to be complete.
*/
void
prof_sample_threshold_update(tsd_t *tsd) {
uint64_t
prof_sample_new_event_wait(tsd_t *tsd) {
#ifdef JEMALLOC_PROF
if (!config_prof) {
return;
}
if (lg_prof_sample == 0) {
te_prof_sample_event_update(tsd, TE_MIN_START_WAIT);
return;
return TE_MIN_START_WAIT;
}
/*
@ -557,10 +552,12 @@ prof_sample_threshold_update(tsd_t *tsd) {
*/
uint64_t r = prng_lg_range_u64(tsd_prng_statep_get(tsd), 53);
double u = (r == 0U) ? 1.0 : (double)r * (1.0/9007199254740992.0L);
uint64_t bytes_until_sample = (uint64_t)(log(u) /
return (uint64_t)(log(u) /
log(1.0 - (1.0 / (double)((uint64_t)1U << lg_prof_sample))))
+ (uint64_t)1U;
te_prof_sample_event_update(tsd, bytes_until_sample);
#else
not_reached();
return TE_MAX_START_WAIT;
#endif
}