diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2012-11-27 22:59:52 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-11-28 07:33:50 -0800 |
| commit | 4b05a1c74d1cfae37cf6ff293ee928350f031418 (patch) | |
| tree | 1b5c9507f5622fbf1affe4fc4e07ed0b60c3413e /include/linux/percpu-rwsem.h | |
| parent | e23739b4ade80a3a7f87198f008f6c44a7cbc9fd (diff) | |
| download | lwn-4b05a1c74d1cfae37cf6ff293ee928350f031418.tar.gz lwn-4b05a1c74d1cfae37cf6ff293ee928350f031418.zip | |
percpu-rwsem: use synchronize_sched_expedited
Use synchronize_sched_expedited() instead of synchronize_sched()
to improve mount speed.
This patch improves mount time from 0.500s to 0.013s for Jeff's
test-case.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reported-and-tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/percpu-rwsem.h')
| -rw-r--r-- | include/linux/percpu-rwsem.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index 250a4acddb2b..bd1e86071e57 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -13,7 +13,7 @@ struct percpu_rw_semaphore { }; #define light_mb() barrier() -#define heavy_mb() synchronize_sched() +#define heavy_mb() synchronize_sched_expedited() static inline void percpu_down_read(struct percpu_rw_semaphore *p) { @@ -51,7 +51,7 @@ static inline void percpu_down_write(struct percpu_rw_semaphore *p) { mutex_lock(&p->mtx); p->locked = true; - synchronize_sched(); /* make sure that all readers exit the rcu_read_lock_sched region */ + synchronize_sched_expedited(); /* make sure that all readers exit the rcu_read_lock_sched region */ while (__percpu_count(p->counters)) msleep(1); heavy_mb(); /* C, between read of p->counter and write to data, paired with B */ |