linux-kernel - Re: OOM killer not nearly agressive enough?

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Message-ID: <20200109210307.GA1553@duo.ucw.cz>
Date:   Thu, 9 Jan 2020 22:03:07 +0100
From:   Pavel Machek <pavel@....cz>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...l.org>, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: OOM killer not nearly agressive enough?

On Thu 2020-01-09 12:56:33, Michal Hocko wrote:
> On Tue 07-01-20 21:44:12, Pavel Machek wrote:
> > Hi!
> > 
> > I updated my userspace to x86-64, and now chromium likes to eat all
> > the memory and bring the system to standstill.
> > 
> > Unfortunately, OOM killer does not react:
> > 
> > I'm now running "ps aux", and it prints one line every 20 seconds or
> > more. Do we agree that is "unusable" system? I attempted to do kill
> > from other session.
> 
> Does sysrq+f help?

May try that next time.

> > Do we agree that OOM killer should have reacted way sooner?
> 
> This is impossible to answer without knowing what was going on at the
> time. Was the system threshing over page cache/swap? In other words, is
> the system completely out of memory or refaulting the working set all
> the time because it doesn't fit into memory?

Swap was full, so "completely out of memory", I guess. Chromium does
that fairly often :-(.

> > Is there something I can tweak to make it behave more reasonably?
> 
> PSI based early OOM killing might help. See https://github.com/facebookincubator/oomd

Um. Before doing that... is there some knob somewhere saying "hey
oomkiller, one hour to recover machine is a bit too much, can you
please react sooner"? PSI is completely different system, but I guess
I should attempt to tweak the existing one first...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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