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Mutex: Make spin count configurable.

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Don't document it since we don't want to support this as a "real" setting, but
it's handy for testing.
This commit is contained in:
David Goldblatt
2021-08-04 12:53:39 -07:00
committed by David Goldblatt
parent dae24589bc
commit 6f41ba55ee
5 changed files with 18 additions and 9 deletions
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10
src/mutex.c
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@@ -9,6 +9,12 @@
#define _CRT_SPINCOUNT 4000
#endif
/*
* Based on benchmark results, a fixed spin with this amount of retries works
* well for our critical sections.
*/
int64_t opt_mutex_max_spin = 250;
/******************************************************************************/
/* Data. */
@@ -51,7 +57,7 @@ malloc_mutex_lock_slow(malloc_mutex_t *mutex) {
goto label_spin_done;
}
int cnt = 0, max_cnt = MALLOC_MUTEX_MAX_SPIN;
int cnt = 0;
do {
spin_cpu_spinwait();
if (!atomic_load_b(&mutex->locked, ATOMIC_RELAXED)
@@ -59,7 +65,7 @@ malloc_mutex_lock_slow(malloc_mutex_t *mutex) {
data->n_spin_acquired++;
return;
}
} while (cnt++ < max_cnt);
} while (cnt++ < opt_mutex_max_spin || opt_mutex_max_spin == -1);
if (!config_stats) {
/* Only spin is useful when stats is off. */