linux-kernel - Re: [PATCH-tip] locking/pvqspinlock: Relax cmpxchg's to improve performance on some archs

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Message-ID: <192df241-642b-9b04-dd5c-31597bf9c574@redhat.com>
Date:   Fri, 9 Dec 2016 11:10:23 -0500
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Pan Xinhui <xinhui@...ux.vnet.ibm.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH-tip] locking/pvqspinlock: Relax cmpxchg's to improve
 performance on some archs

On 12/09/2016 11:05 AM, Peter Zijlstra wrote:
> On Tue, Dec 06, 2016 at 02:14:42PM -0500, Waiman Long wrote:
>> A number of cmpxchg calls in qspinlock_paravirt.h were replaced by more
>> relaxed versions to improve performance on architectures that use LL/SC.
> I would feel so much better if each change were to have some rationale
> included. Either enumerate them in the changelog, or split them up into
> smaller patches.
>
>
OK, I will update the patch to either document them with comments or
enumerate them in the change log.

Cheers,
Longman