Re: [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg

From	Jason Low <jason.low2@hp.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg
Date	2015-06-16 03:10 +0200
Message-ID	<pBNy2-3LE-5@gated-at.bofh.it> (permalink)
References	(1 earlier) <prTv4-4VH-5@gated-at.bofh.it> <pxZ4K-9G-13@gated-at.bofh.it> <pyocO-427-3@gated-at.bofh.it> <pBHsB-3bH-3@gated-at.bofh.it> <pBIoG-4yI-15@gated-at.bofh.it>
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On Mon, Jun 15, 2015 at 12:37 PM, Davidlohr Bueso <dave@stgolabs.net> wrote:
> On Mon, 2015-06-15 at 11:34 -0700, Jason Low wrote:
>> The CCAS technique was typically used in the slow paths for those
>> other locks, where the chance of the operation returning false is
>> higher.
>
> That is true. Although I really want to use it in patch 4, I guess I
> could move the check in there, and thus avoid having it in the fastpath.

I agree, that way, we only have the extra check in cases where it is
beneficial, like in the optimistic spin loop.

Jason
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Re: [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg Davidlohr Bueso <dave@stgolabs.net> - 2015-06-15 21:40 +0200
  Re: [PATCH 2/4] locking/rtmutex: Use cmp-cmpxchg Jason Low <jason.low2@hp.com> - 2015-06-16 03:10 +0200

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