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authorUros Bizjak <ubizjak@gmail.com>2022-07-12 18:44:55 +0300
committerJens Axboe <axboe@kernel.dk>2022-07-13 00:46:03 +0300
commit96388f57d2aad9836b2c589181fa1dbaba4066b4 (patch)
tree8d55b77e103b15559c7b64e034ca5ea0df21ea0e /block/blk-cgroup.h
parentaee8960c2eae12636040dbf0f04e135273b1612d (diff)
downloadlinux-96388f57d2aad9836b2c589181fa1dbaba4066b4.tar.xz
blk-cgroup: Use atomic{,64}_try_cmpxchg
Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old in blkcg_unuse_delay, blkcg_set_delay and blkcg_clear_delay and atomic64_try_cmpxchg in blkcg_scale_delay. x86 CMPXCHG instruction returns success in ZF flag, so this change saves a compare after cmpxchg (and related move instruction in front of cmpxchg). Also, atomic_try_cmpxchg implicitly assigns old *ptr value to "old" when cmpxchg fails, enabling further code simplifications. No functional change intended. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Cc: Jens Axboe <axboe@kernel.dk> Link: https://lore.kernel.org/r/20220712154455.66868-1-ubizjak@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-cgroup.h')
-rw-r--r--block/blk-cgroup.h12
1 files changed, 4 insertions, 8 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index d4de0a35e066..d2724d1dd7c9 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -430,12 +430,8 @@ static inline int blkcg_unuse_delay(struct blkcg_gq *blkg)
* then check to see if we were the last delay so we can drop the
* congestion count on the cgroup.
*/
- while (old) {
- int cur = atomic_cmpxchg(&blkg->use_delay, old, old - 1);
- if (cur == old)
- break;
- old = cur;
- }
+ while (old && !atomic_try_cmpxchg(&blkg->use_delay, &old, old - 1))
+ ;
if (old == 0)
return 0;
@@ -458,7 +454,7 @@ static inline void blkcg_set_delay(struct blkcg_gq *blkg, u64 delay)
int old = atomic_read(&blkg->use_delay);
/* We only want 1 person setting the congestion count for this blkg. */
- if (!old && atomic_cmpxchg(&blkg->use_delay, old, -1) == old)
+ if (!old && atomic_try_cmpxchg(&blkg->use_delay, &old, -1))
atomic_inc(&blkg->blkcg->css.cgroup->congestion_count);
atomic64_set(&blkg->delay_nsec, delay);
@@ -475,7 +471,7 @@ static inline void blkcg_clear_delay(struct blkcg_gq *blkg)
int old = atomic_read(&blkg->use_delay);
/* We only want 1 person clearing the congestion count for this blkg. */
- if (old && atomic_cmpxchg(&blkg->use_delay, old, 0) == old)
+ if (old && atomic_try_cmpxchg(&blkg->use_delay, &old, 0))
atomic_dec(&blkg->blkcg->css.cgroup->congestion_count);
}