Messages in this thread | | | From | Jens Axboe <> | Subject | Re: [PATCH v2] blk-iolatency: Use atomic{,64}_try_cmpxchg | Date | Tue, 12 Jul 2022 15:45:44 -0600 |
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On Tue, 12 Jul 2022 17:19:47 +0200, Uros Bizjak wrote: > Use atomic_try_cmpxchg instead of atomic_cmpxchg (*ptr, old, new) == old > in check_scale_change and atomic64_try_cmpxchg in blkcg_iolatency_done_bio. > x86 CMPXCHG instruction returns success in ZF flag, so this change saves a > compare after cmpxchg (and related move instruction in front of cmpxchg). > > No functional change intended. > > [...]
Applied, thanks!
[1/1] blk-iolatency: Use atomic{,64}_try_cmpxchg commit: aee8960c2eae12636040dbf0f04e135273b1612d
Best regards, -- Jens Axboe
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