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| author | Greg Becker <becker.greg@att.net> | 2023-06-27 01:08:29 +0000 |
|---|---|---|
| committer | Mateusz Guzik <mjg@FreeBSD.org> | 2023-06-27 11:56:44 +0000 |
| commit | a6c0d801ca5934bb9b9cca6870ea7406d5db0641 (patch) | |
| tree | 52d76cca3edf28b3e56709c7407744b4288da2bb | |
| parent | 4a402dfe0bc44770c9eac6e58a501e4805e29413 (diff) | |
| download | src-a6c0d801ca5934bb9b9cca6870ea7406d5db0641.tar.gz src-a6c0d801ca5934bb9b9cca6870ea7406d5db0641.zip | |
libpthread: allocate rwlocks and spinlocks in dedicated cachelines
Reduces severe performance degradation due to false-sharing. Note that this
does not account for hardware which can perform adjacent cacheline prefetch.
[mjg: massaged the commit message and the patch to use aligned_alloc
instead of malloc]
PR: 272238
MFC after: 1 week
| -rw-r--r-- | lib/libthr/thread/thr_pspinlock.c | 3 | ||||
| -rw-r--r-- | lib/libthr/thread/thr_rwlock.c | 5 |
2 files changed, 6 insertions, 2 deletions
diff --git a/lib/libthr/thread/thr_pspinlock.c b/lib/libthr/thread/thr_pspinlock.c index 089416a18a07..374fe498034b 100644 --- a/lib/libthr/thread/thr_pspinlock.c +++ b/lib/libthr/thread/thr_pspinlock.c @@ -60,7 +60,8 @@ _pthread_spin_init(pthread_spinlock_t *lock, int pshared) if (lock == NULL) return (EINVAL); if (pshared == PTHREAD_PROCESS_PRIVATE) { - lck = malloc(sizeof(struct pthread_spinlock)); + lck = aligned_alloc(CACHE_LINE_SIZE, + roundup(sizeof(struct pthread_spinlock), CACHE_LINE_SIZE)); if (lck == NULL) return (ENOMEM); *lock = lck; diff --git a/lib/libthr/thread/thr_rwlock.c b/lib/libthr/thread/thr_rwlock.c index b7526376a9a3..3e8af974fa18 100644 --- a/lib/libthr/thread/thr_rwlock.c +++ b/lib/libthr/thread/thr_rwlock.c @@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$"); #include <errno.h> #include <limits.h> #include <stdlib.h> +#include <string.h> #include "namespace.h" #include <pthread.h> @@ -102,9 +103,11 @@ rwlock_init(pthread_rwlock_t *rwlock, const pthread_rwlockattr_t *attr) if (attr == NULL || *attr == NULL || (*attr)->pshared == PTHREAD_PROCESS_PRIVATE) { - prwlock = calloc(1, sizeof(struct pthread_rwlock)); + prwlock = aligned_alloc(CACHE_LINE_SIZE, + roundup(sizeof(struct pthread_rwlock), CACHE_LINE_SIZE)); if (prwlock == NULL) return (ENOMEM); + memset(prwlock, 0, sizeof(struct pthread_rwlock)); *rwlock = prwlock; } else { prwlock = __thr_pshared_offpage(rwlock, 1); |