linux-kernel - Re: [PATCH] z3fold: make pages

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Message-ID: <CAMJBoFOJqSk+KE8y_jtvGe5TBHevei7ZRjg93tvb1MuqaO9BZg@mail.gmail.com>
Date:   Thu, 3 Nov 2016 22:24:07 +0100
From:   Vitaly Wool <vitalywool@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Dan Streetman <ddstreet@...e.org>
Subject: Re: [PATCH] z3fold: make pages_nr atomic

On Thu, Nov 3, 2016 at 10:14 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Thu, 3 Nov 2016 22:00:58 +0100 Vitaly Wool <vitalywool@...il.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