linux-kernel - Re: Silent hang up caused by pages being not scanned?

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Message-ID: <20151019125729.GG11998@dhcp22.suse.cz>
Date:	Mon, 19 Oct 2015 14:57:29 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	torvalds@...ux-foundation.org, rientjes@...gle.com,
	oleg@...hat.com, kwalker@...hat.com, cl@...ux.com,
	akpm@...ux-foundation.org, hannes@...xchg.org,
	vdavydov@...allels.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, skozina@...hat.com, mgorman@...e.de,
	riel@...hat.com
Subject: Re: Silent hang up caused by pages being not scanned?

On Sat 17-10-15 03:49:39, Tetsuo Handa wrote:
> Linus Torvalds wrote:
> > Tetsuo, mind trying it out and maybe tweaking it a bit for the load
> > you have? Does it seem to improve on your situation?
> 
> Yes, I already tried it and just replied to Michal.
> 
> I tested for one hour using various memory stressing programs.
> As far as I tested, I did not hit silent hang up (

Thank you for your testing!

[...]

> Only problem I felt is that the ratio of inactive_file/writeback
> (shown below) was high (compared to shown above) when I did

Yes this is the lack of congestion on the bdi as Linus expected.
Another patch I've just posted should help in that regards. At least it
seems to help in my testing.

[...]

> I can still hit OOM livelock (
> 
>  MemAlloc-Info: X stalling task, Y dying task, Z victim task.
> 
> where X > 0 && Y > 0).

This seems a separate issue, though.
-- 
Michal Hocko
SUSE Labs
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