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Optimize away the tsd_fast() check on fastpath.

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Fold the tsd_state check onto the event threshold check.  The fast threshold is
set to 0 when tsd switch to non-nominal.

The fast_threshold can be reset by remote threads, to refect the non nominal tsd
state change.
This commit is contained in:
Qi Wang 2019-11-11 16:34:48 -08:00 • committed by Qi Wang
parent 1decf958d1
commit dd649c9485
6 changed files with 144 additions and 21 deletions
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10
src/tsd.c
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@ -115,8 +115,11 @@ tsd_force_recompute(tsdn_t *tsdn) {
ql_foreach(remote_tsd, &tsd_nominal_tsds, TSD_MANGLE(tcache).tsd_link) {
assert(tsd_atomic_load(&remote_tsd->state, ATOMIC_RELAXED)
<= tsd_state_nominal_max);
tsd_atomic_store(&remote_tsd->state, tsd_state_nominal_recompute,
ATOMIC_RELAXED);
tsd_atomic_store(&remote_tsd->state,
tsd_state_nominal_recompute, ATOMIC_RELAXED);
/* See comments in thread_event_recompute_fast_threshold(). */
atomic_fence(ATOMIC_SEQ_CST);
thread_allocated_next_event_fast_set_non_nominal(remote_tsd);
}
malloc_mutex_unlock(tsdn, &tsd_nominal_tsds_lock);
}
@ -175,6 +178,8 @@ tsd_slow_update(tsd_t *tsd) {
old_state = tsd_atomic_exchange(&tsd->state, new_state,
ATOMIC_ACQUIRE);
} while (old_state == tsd_state_nominal_recompute);
thread_event_recompute_fast_threshold(tsd);
}
void
@ -213,6 +218,7 @@ tsd_state_set(tsd_t *tsd, uint8_t new_state) {
tsd_slow_update(tsd);
}
}
thread_event_recompute_fast_threshold(tsd);
}
static bool