linux-kernel - Re: [PATCH v2 07/11] convert this_cpu_cmpxchg users to this_cpu_cmpxchg

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Date:   Thu, 2 Mar 2023 15:54:59 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Christoph Lameter <cl@...ux.com>,
        Aaron Tomlin <atomlin@...mlin.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 07/11] convert this_cpu_cmpxchg users to
 this_cpu_cmpxchg_local

On Thu, Feb 09, 2023 at 12:01:57PM -0300, Marcelo Tosatti wrote:
> this_cpu_cmpxchg was modified to atomic version, which 
> can be more costly than non-atomic version.
> 
> Switch users of this_cpu_cmpxchg to this_cpu_cmpxchg_local
> (which preserves pre-non-atomic this_cpu_cmpxchg behaviour).
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>

Yes afaict these are the only pieces that uses the helper besides vmstat
udpates.

Acked-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu