Re: [PATCH] z3fold: make pages_nr atomic

[Vitaly Wool]

On Thu, Nov 3, 2016 at 10:14 PM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Thu, 3 Nov 2016 22:00:58 +0100 Vitaly Wool <vitalywool@xxxxxxxxx> 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