linux-kernel - Re: [PATCH] mm, vmscan: do not loop on too_many

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Message-ID: <20170710165859.GA12036@cmpxchg.org>
Date:   Mon, 10 Jul 2017 12:58:59 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Rik van Riel <riel@...hat.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] mm, vmscan: do not loop on too_many_isolated for ever

On Mon, Jul 10, 2017 at 09:58:03AM -0400, Rik van Riel wrote:
> On Mon, 2017-07-10 at 09:48 +0200, Michal Hocko wrote:
> 
> > Johannes and Rik had some concerns that this could lead to premature
> > OOM kills. I agree with them that we need a better throttling
> > mechanism. Until now we didn't give the issue described above a high
> > priority because it usually required a really insane workload to
> > trigger. But it seems that the issue can be reproduced also without
> > having an insane number of competing threads [3].
> 
> My worries stand, but lets fix the real observed bug, and not worry
> too much about the theoretical bug for now.
> 
> Acked-by: Rik van Riel <riel@...hat.com>

I agree with this.

Acked-by: Johannes Weiner <hannes@...xchg.org>