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From: Vitaly Wool <vitalywool@gmail.com>
Newsgroups: linux.kernel
Subject: Re: [PATCH] z3fold: make pages_nr atomic
Date: Thu, 03 Nov 2016 22:30:01 +0100
Message-ID: <szxK9-Rd-27@gated-at.bofh.it>
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On Thu, Nov 3, 2016 at 10:14 PM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Thu, 3 Nov 2016 22:00:58 +0100 Vitaly Wool <vitalywool@gmail.com> wrote:
>
>> This patch converts pages_nr per-pool counter to atomic64_t.
>
> Which is slower.
>
> Presumably there is a reason for making this change.  This reason
> should be described in the changelog.

The reason [which I thought was somewhat obvious :) ] is that there
won't be a need to take a per-pool lock to read or modify that
counter.

Best regards,
   Vitaly