linux-kernel - Re: [PATCH 2/3] mm, vmscan: consider eligible zones in get_scan

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Date:   Mon, 6 Feb 2017 15:40:50 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...e.de>,
        Minchan Kim <minchan@...nel.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Trevor Cordes <trevor@...nopolis.ca>
Subject: Re: [PATCH 2/3] mm, vmscan: consider eligible zones in
 get_scan_count

On Mon, 6 Feb 2017 09:10:07 +0100 Michal Hocko <mhocko@...nel.org> wrote:

> Hi Andrew,
> it turned out that this is not a theoretical issue after all. Trevor
> (added to the CC) was seeing pre-mature OOM killer triggering [1]
> bisected to b2e18757f2c9 ("mm, vmscan: begin reclaiming pages on a
> per-node basis").
> After some going back and forth it turned out that b4536f0c829c ("mm,
> memcg: fix the active list aging for lowmem requests when memcg is
> enabled") helped a lot but it wasn't sufficient on its own. We also
> need this patch to make the oom behavior stable again. So I suggest
> backporting this to stable as well. Could you update the changelog as
> follows?
> 
> The patch would need to be tweaked a bit to apply to 4.10 and older
> but I will do that as soon as it hits the Linus tree in the next merge
> window.
> 
> ...
>
> Fixes: b2e18757f2c9 ("mm, vmscan: begin reclaiming pages on a per-node basis")
> Cc: stable # 4.8+
> Tested-by: Trevor Cordes <trevor@...nopolis.ca>

No probs.