diff options
Diffstat (limited to 'memory/mozjemalloc')
| -rw-r--r-- | memory/mozjemalloc/jemalloc.c | 82 |
1 files changed, 30 insertions, 52 deletions
diff --git a/memory/mozjemalloc/jemalloc.c b/memory/mozjemalloc/jemalloc.c index de39c831f..8516658f5 100644 --- a/memory/mozjemalloc/jemalloc.c +++ b/memory/mozjemalloc/jemalloc.c @@ -433,10 +433,6 @@ void *_mmap(void *addr, size_t length, int prot, int flags, #endif #endif -#ifdef MOZ_MEMORY_DARWIN -static const bool isthreaded = true; -#endif - #if defined(MOZ_MEMORY_SOLARIS) && defined(MAP_ALIGN) && !defined(JEMALLOC_NEVER_USES_MAP_ALIGN) #define JEMALLOC_USES_MAP_ALIGN /* Required on Solaris 10. Might improve performance elsewhere. */ #endif @@ -471,9 +467,7 @@ static const bool isthreaded = true; # define SIZEOF_PTR_2POW 2 #endif #define PIC -#ifndef MOZ_MEMORY_DARWIN -static const bool isthreaded = true; -#else +#ifdef MOZ_MEMORY_DARWIN # define NO_TLS #endif #if 0 @@ -1635,9 +1629,8 @@ static bool malloc_mutex_init(malloc_mutex_t *mutex) { #if defined(MOZ_MEMORY_WINDOWS) - if (isthreaded) - if (! __crtInitCritSecAndSpinCount(mutex, _CRT_SPINCOUNT)) - return (true); + if (! __crtInitCritSecAndSpinCount(mutex, _CRT_SPINCOUNT)) + return (true); #elif defined(MOZ_MEMORY_DARWIN) mutex->lock = OS_SPINLOCK_INIT; #elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) @@ -1672,8 +1665,7 @@ malloc_mutex_lock(malloc_mutex_t *mutex) #elif defined(MOZ_MEMORY) pthread_mutex_lock(mutex); #else - if (isthreaded) - _SPINLOCK(&mutex->lock); + _SPINLOCK(&mutex->lock); #endif } @@ -1688,8 +1680,7 @@ malloc_mutex_unlock(malloc_mutex_t *mutex) #elif defined(MOZ_MEMORY) pthread_mutex_unlock(mutex); #else - if (isthreaded) - _SPINUNLOCK(&mutex->lock); + _SPINUNLOCK(&mutex->lock); #endif } @@ -1700,9 +1691,8 @@ static bool malloc_spin_init(malloc_spinlock_t *lock) { #if defined(MOZ_MEMORY_WINDOWS) - if (isthreaded) - if (! __crtInitCritSecAndSpinCount(lock, _CRT_SPINCOUNT)) - return (true); + if (! __crtInitCritSecAndSpinCount(lock, _CRT_SPINCOUNT)) + return (true); #elif defined(MOZ_MEMORY_DARWIN) lock->lock = OS_SPINLOCK_INIT; #elif defined(MOZ_MEMORY_LINUX) && !defined(MOZ_MEMORY_ANDROID) @@ -1735,8 +1725,7 @@ malloc_spin_lock(malloc_spinlock_t *lock) #elif defined(MOZ_MEMORY) pthread_mutex_lock(lock); #else - if (isthreaded) - _SPINLOCK(&lock->lock); + _SPINLOCK(&lock->lock); #endif } @@ -1750,8 +1739,7 @@ malloc_spin_unlock(malloc_spinlock_t *lock) #elif defined(MOZ_MEMORY) pthread_mutex_unlock(lock); #else - if (isthreaded) - _SPINUNLOCK(&lock->lock); + _SPINUNLOCK(&lock->lock); #endif } @@ -1805,30 +1793,28 @@ malloc_spin_lock(pthread_mutex_t *lock) { unsigned ret = 0; - if (isthreaded) { - if (_pthread_mutex_trylock(lock) != 0) { - unsigned i; - volatile unsigned j; - - /* Exponentially back off. */ - for (i = 1; i <= SPIN_LIMIT_2POW; i++) { - for (j = 0; j < (1U << i); j++) - ret++; + if (_pthread_mutex_trylock(lock) != 0) { + unsigned i; + volatile unsigned j; - CPU_SPINWAIT; - if (_pthread_mutex_trylock(lock) == 0) - return (ret); - } + /* Exponentially back off. */ + for (i = 1; i <= SPIN_LIMIT_2POW; i++) { + for (j = 0; j < (1U << i); j++) + ret++; - /* - * Spinning failed. Block until the lock becomes - * available, in order to avoid indefinite priority - * inversion. - */ - _pthread_mutex_lock(lock); - assert((ret << BLOCK_COST_2POW) != 0); - return (ret << BLOCK_COST_2POW); + CPU_SPINWAIT; + if (_pthread_mutex_trylock(lock) == 0) + return (ret); } + + /* + * Spinning failed. Block until the lock becomes + * available, in order to avoid indefinite priority + * inversion. + */ + _pthread_mutex_lock(lock); + assert((ret << BLOCK_COST_2POW) != 0); + return (ret << BLOCK_COST_2POW); } return (ret); @@ -1837,9 +1823,7 @@ malloc_spin_lock(pthread_mutex_t *lock) static inline void malloc_spin_unlock(pthread_mutex_t *lock) { - - if (isthreaded) - _pthread_mutex_unlock(lock); + _pthread_mutex_unlock(lock); } #endif @@ -3089,10 +3073,6 @@ choose_arena(void) * introduces a bootstrapping issue. */ #ifndef NO_TLS - if (isthreaded == false) { - /* Avoid the overhead of TLS for single-threaded operation. */ - return (arenas[0]); - } # ifdef MOZ_MEMORY_WINDOWS ret = (arena_t*)TlsGetValue(tlsIndex); @@ -3105,7 +3085,7 @@ choose_arena(void) RELEASE_ASSERT(ret != NULL); } #else - if (isthreaded && narenas > 1) { + if (narenas > 1) { unsigned long ind; /* @@ -3162,8 +3142,6 @@ choose_arena_hard(void) { arena_t *ret; - assert(isthreaded); - #ifdef MALLOC_BALANCE /* Seed the PRNG used for arena load balancing. */ SPRN(balance, (uint32_t)(uintptr_t)(_pthread_self())); |