linux-kernel - Re: [patch v2] mm, oom: fix concurrent munlock and oom reaper unmap

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Message-ID: <20180423160920.GX17484@dhcp22.suse.cz>
Date:   Mon, 23 Apr 2018 10:09:20 -0600
From:   Michal Hocko <mhocko@...nel.org>
To:     David Rientjes <rientjes@...gle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Roman Gushchin <guro@...com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [patch v2] mm, oom: fix concurrent munlock and oom reaper unmap

On Sun 22-04-18 07:18:57, Michal Hocko wrote:
> On Sat 21-04-18 20:45:11, David Rientjes wrote:
[...]
> Maybe invoking the reaper as suggested by Tetsuo will help here. Maybe
> we will come up with something more smart. But I would like to have a
> stop gap solution for stable that is easy enough. And your patch is not
> doing that because it adds a very subtle dependency on the page lock.
> So please stop repeating your arguments all over and either come with
> an argument which proves me wrong and the lock_page dependency is not
> real or come with an alternative solution which doesn't make
> MMF_OOM_SKIP depend on the page lock.

I though I would give this a try but I am at a conference and quite
busy. Tetsuo are you willing to give it a try so that we have something
to compare and decide, please?
-- 
Michal Hocko
SUSE Labs