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author | Mateusz Guzik <mjg@FreeBSD.org> | 2017-02-05 09:54:16 +0000 |
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committer | Mateusz Guzik <mjg@FreeBSD.org> | 2017-02-05 09:54:16 +0000 |
commit | 6ebb77b6a6dcc1fd13c7ac9f94ab3ec536ce50f5 (patch) | |
tree | 6d580299b2242eff129dd2c83b9e3287d86bb3f8 /sys/kern | |
parent | dc0896512cd91cb390cc35ba96e9285cd04383da (diff) | |
download | src-6ebb77b6a6dcc1fd13c7ac9f94ab3ec536ce50f5.tar.gz src-6ebb77b6a6dcc1fd13c7ac9f94ab3ec536ce50f5.zip |
sx: move lockstat handling out of inline primitives
See r313275 for details.
Notes
Notes:
svn path=/head/; revision=313280
Diffstat (limited to 'sys/kern')
-rw-r--r-- | sys/kern/kern_sx.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/sys/kern/kern_sx.c b/sys/kern/kern_sx.c index 183726c8e558..4cce16d301b8 100644 --- a/sys/kern/kern_sx.c +++ b/sys/kern/kern_sx.c @@ -310,6 +310,7 @@ sx_try_slock_(struct sx *sx, const char *file, int line) int _sx_xlock(struct sx *sx, int opts, const char *file, int line) { + uintptr_t tid, x; int error = 0; if (SCHEDULER_STOPPED()) @@ -321,7 +322,13 @@ _sx_xlock(struct sx *sx, int opts, const char *file, int line) ("sx_xlock() of destroyed sx @ %s:%d", file, line)); WITNESS_CHECKORDER(&sx->lock_object, LOP_NEWORDER | LOP_EXCLUSIVE, file, line, NULL); - error = __sx_xlock(sx, curthread, opts, file, line); + tid = (uintptr_t)curthread; + x = SX_LOCK_UNLOCKED; + if (!atomic_fcmpset_acq_ptr(&sx->sx_lock, &x, tid)) + error = _sx_xlock_hard(sx, x, tid, opts, file, line); + else + LOCKSTAT_PROFILE_OBTAIN_RWLOCK_SUCCESS(sx__acquire, sx, + 0, 0, file, line, LOCKSTAT_WRITER); if (!error) { LOCK_LOG_LOCK("XLOCK", &sx->lock_object, 0, sx->sx_recurse, file, line); @@ -379,7 +386,7 @@ _sx_xunlock(struct sx *sx, const char *file, int line) WITNESS_UNLOCK(&sx->lock_object, LOP_EXCLUSIVE, file, line); LOCK_LOG_LOCK("XUNLOCK", &sx->lock_object, 0, sx->sx_recurse, file, line); - __sx_xunlock(sx, curthread, file, line); + _sx_xunlock_hard(sx, (uintptr_t)curthread, file, line); TD_LOCKS_DEC(curthread); } @@ -757,8 +764,13 @@ _sx_xunlock_hard(struct sx *sx, uintptr_t tid, const char *file, int line) MPASS(!(sx->sx_lock & SX_LOCK_SHARED)); - /* If the lock is recursed, then unrecurse one level. */ - if (sx_xlocked(sx) && sx_recursed(sx)) { + if (!sx_recursed(sx)) { + LOCKSTAT_PROFILE_RELEASE_RWLOCK(sx__release, sx, + LOCKSTAT_WRITER); + if (atomic_cmpset_rel_ptr(&sx->sx_lock, tid, SX_LOCK_UNLOCKED)) + return; + } else { + /* The lock is recursed, unrecurse one level. */ if ((--sx->sx_recurse) == 0) atomic_clear_ptr(&sx->sx_lock, SX_LOCK_RECURSED); if (LOCK_LOG_TEST(&sx->lock_object, 0)) |