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

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Message-Id: <20161103151700.73a98155238acff3f3f98e8b@linux-foundation.org>
Date:   Thu, 3 Nov 2016 15:17:00 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vitaly Wool <vitalywool@...il.com>
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, 3 Nov 2016 22:24:07 +0100 Vitaly Wool <vitalywool@...il.com> wrote:

> 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.

But the patch didn't change the locking.  And as far as I can tell,
neither does "z3fold: extend compaction function".