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Implement malloc_mutex_trylock() w/ proper stats update.

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This commit is contained in:
Qi Wang 2017-04-21 15:05:43 -07:00 committed by Qi Wang
parent af76f0e5d2
commit f970c497dc
3 changed files with 36 additions and 14 deletions
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42
include/jemalloc/internal/mutex_inlines.h
View File

@ -10,10 +10,36 @@ malloc_mutex_lock_final(malloc_mutex_t *mutex) {
MALLOC_MUTEX_LOCK(mutex);
}
static inline bool
malloc_mutex_trylock_final(malloc_mutex_t *mutex) {
return MALLOC_MUTEX_TRYLOCK(mutex);
}
static inline void
mutex_owner_stats_update(tsdn_t *tsdn, malloc_mutex_t *mutex) {
if (config_stats) {
mutex_prof_data_t *data = &mutex->prof_data;
data->n_lock_ops++;
if (data->prev_owner != tsdn) {
data->prev_owner = tsdn;
data->n_owner_switches++;
}
}
}
/* Trylock: return false if the lock is successfully acquired. */
static inline bool
malloc_mutex_trylock(malloc_mutex_t *mutex) {
return MALLOC_MUTEX_TRYLOCK(mutex);
malloc_mutex_trylock(tsdn_t *tsdn, malloc_mutex_t *mutex) {
witness_assert_not_owner(tsdn, &mutex->witness);
if (isthreaded) {
if (malloc_mutex_trylock_final(mutex)) {
return true;
}
mutex_owner_stats_update(tsdn, mutex);
}
witness_lock(tsdn, &mutex->witness);
return false;
}
/* Aggregate lock prof data. */
@ -44,18 +70,10 @@ static inline void
malloc_mutex_lock(tsdn_t *tsdn, malloc_mutex_t *mutex) {
witness_assert_not_owner(tsdn, &mutex->witness);
if (isthreaded) {
if (malloc_mutex_trylock(mutex)) {
if (malloc_mutex_trylock_final(mutex)) {
malloc_mutex_lock_slow(mutex);
}
/* We own the lock now. Update a few counters. */
if (config_stats) {
mutex_prof_data_t *data = &mutex->prof_data;
data->n_lock_ops++;
if (data->prev_owner != tsdn) {
data->prev_owner = tsdn;
data->n_owner_switches++;
}
}
mutex_owner_stats_update(tsdn, mutex);
}
witness_lock(tsdn, &mutex->witness);
}

4
include/jemalloc/internal/private_symbols.txt
View File

@ -292,10 +292,13 @@ malloc_mutex_assert_owner
malloc_mutex_boot
malloc_mutex_init
malloc_mutex_lock
malloc_mutex_lock_final
malloc_mutex_lock_slow
malloc_mutex_postfork_child
malloc_mutex_postfork_parent
malloc_mutex_prefork
malloc_mutex_trylock
malloc_mutex_trylock_final
malloc_mutex_unlock
malloc_printf
malloc_slow
@ -309,6 +312,7 @@ malloc_tsd_malloc
malloc_vcprintf
malloc_vsnprintf
malloc_write
mutex_owner_stats_update
narenas_auto
narenas_total_get
ncpus

4
src/mutex.c
View File

@ -81,7 +81,7 @@ malloc_mutex_lock_slow(malloc_mutex_t *mutex) {
int cnt = 0, max_cnt = MALLOC_MUTEX_MAX_SPIN;
do {
CPU_SPINWAIT;
if (!malloc_mutex_trylock(mutex)) {
if (!malloc_mutex_trylock_final(mutex)) {
data->n_spin_acquired++;
return;
}
@ -100,7 +100,7 @@ label_spin_done:
uint32_t n_thds = atomic_fetch_add_u32(&data->n_waiting_thds, 1,
ATOMIC_RELAXED) + 1;
/* One last try as above two calls may take quite some cycles. */
if (!malloc_mutex_trylock(mutex)) {
if (!malloc_mutex_trylock_final(mutex)) {
atomic_fetch_sub_u32(&data->n_waiting_thds, 1, ATOMIC_RELAXED);
data->n_spin_acquired++;
return;