linux-kernel - Re: [PATCH] mm, oom: protect !costly allocations some more (was: Re: [PATCH 0/3] OOM detection rework v4)

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Message-ID: <20160308092435.GA3860@swordfish>
Date:	Tue, 8 Mar 2016 18:24:35 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <js1304@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH] mm, oom: protect !costly allocations some more (was: Re:
 [PATCH 0/3] OOM detection rework v4)

On (03/08/16 10:08), Michal Hocko wrote:
> On Tue 08-03-16 12:51:04, Sergey Senozhatsky wrote:
> > Hello Michal,
> > 
> > On (03/07/16 17:08), Michal Hocko wrote:
> > > On Mon 29-02-16 22:02:13, Michal Hocko wrote:
> > > > Andrew,
> > > > could you queue this one as well, please? This is more a band aid than a
> > > > real solution which I will be working on as soon as I am able to
> > > > reproduce the issue but the patch should help to some degree at least.
> > > 
> > > Joonsoo wasn't very happy about this approach so let me try a different
> > > way. What do you think about the following? Hugh, Sergey does it help
> > > for your load? I have tested it with the Hugh's load and there was no
> > > major difference from the previous testing so at least nothing has blown
> > > up as I am not able to reproduce the issue here.
> > 
> > (next-20160307 + "[PATCH] mm, oom: protect !costly allocations some more")
> > 
> > seems it's significantly less likely to oom-kill now, but I still can see
> > something like this
> 
> Thanks for the testing. This is highly appreciated. If you are able to
> reproduce this then collecting compaction related tracepoints might be
> really helpful.
> 

oh, wow... compaction is disabled, somehow.

  $ zcat /proc/config.gz | grep -i CONFIG_COMPACTION
  # CONFIG_COMPACTION is not set

I should have checked that, sorry!

will enable and re-test.

	-ss