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

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Date:   Fri, 9 Dec 2016 17:05:34 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
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 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.