linux-kernel - Re: [PATCH] mm, vmscan: do not count freed pages as PGDEACTIVATE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 13 Jan 2017 10:55:00 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm, vmscan: do not count freed pages as PGDEACTIVATE

On 01/12/2017 10:12 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> PGDEACTIVATE represents the number of pages moved from the active list
> to the inactive list. At least this sounds like the original motivation
> of the counter. move_active_pages_to_lru, however, counts pages which
> got freed in the mean time as deactivated as well. This is a very rare
> event and counting them as deactivation in itself is not harmful but it
> makes the code more convoluted than necessary - we have to count both
> all pages and those which are freed which is a bit confusing.
>
> After this patch the PGDEACTIVATE should have a slightly more clear
> semantic and only count those pages which are moved from the active to
> the inactive list which is a plus.
>
> Suggested-by: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>