linux-kernel - Re: [RFC PATCH 1/2] mm, vmscan: account the number of isolated pages per zone

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Message-ID: <20170221155337.GK15595@dhcp22.suse.cz>
Date:   Tue, 21 Feb 2017 16:53:37 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     david@...morbit.com, dchinner@...hat.com, hch@....de,
        mgorman@...e.de, viro@...IV.linux.org.uk, linux-mm@...ck.org,
        hannes@...xchg.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] mm, vmscan: account the number of isolated pages
 per zone

On Tue 21-02-17 23:35:07, Tetsuo Handa wrote:
> Michal Hocko wrote:
> > OK, so it seems that all the distractions are handled now and linux-next
> > should provide a reasonable base for testing. You said you weren't able
> > to reproduce the original long stalls on too_many_isolated(). I would be
> > still interested to see those oom reports and potential anomalies in the
> > isolated counts before I send the patch for inclusion so your further
> > testing would be more than appreciated. Also stalls > 10s without any
> > previous occurrences would be interesting.
> 
> I confirmed that linux-next-20170221 with kmallocwd applied can reproduce
> infinite too_many_isolated() loop problem. Please send your patches to linux-next.

So I assume that you didn't see the lockup with the patch applied and
the OOM killer has resolved the situation by killing other tasks, right?
Can I assume your Tested-by?

Thanks for your testing!
-- 
Michal Hocko
SUSE Labs