linux-kernel - Re: [PATCH 0/3] OOM detection rework v4

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Message-ID: <20160225110235.GA493@swordfish>
Date:	Thu, 25 Feb 2016 20:02:35 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Hillf Danton <hillf.zj@...baba-inc.com>
Cc:	'Michal Hocko' <mhocko@...nel.org>,
	'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>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, 'LKML' <linux-kernel@...r.kernel.org>,
	'Sergey Senozhatsky' <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH 0/3] OOM detection rework v4

On (02/25/16 17:48), Hillf Danton wrote:
> > > Can you please schedule a run for the diff attached, in which
> > > non-expensive allocators are allowed to burn more CPU cycles.
> > 
> > I do not think your patch will help. As you can see, both OOMs were for
> > order-2 and there simply are no order-2+ free blocks usable for the
> > allocation request so the watermark check will fail for all eligible
> > zones and no_progress_loops is simply ignored. This is what I've tried
> > to address by patch I have just posted as a reply to Hugh's email
> > http://lkml.kernel.org/r/20160225092315.GD17573@dhcp22.suse.cz
> > 
> Hm, Mr. Swap can tell us more.


Hi,

after *preliminary testing* both patches seem to work. at least I don't
see oom-kills and there are some swapouts.

Michal Hocko's
              total        used        free      shared  buff/cache   available
Mem:        3836880     2458020       35992      115984     1342868     1181484
Swap:       8388604        2008     8386596

              total        used        free      shared  buff/cache   available
Mem:        3836880     2459516       39616      115880     1337748     1180156
Swap:       8388604        2052     8386552

              total        used        free      shared  buff/cache   available
Mem:        3836880     2460584       33944      115880     1342352     1179004
Swap:       8388604        2132     8386472
...




Hillf Danton's
              total        used        free      shared  buff/cache   available
Mem:        3836880     1661000      554236      116448     1621644     1978872
Swap:       8388604        1548     8387056

              total        used        free      shared  buff/cache   available
Mem:        3836880     1660500      554740      116448     1621640     1979376
Swap:       8388604        1548     8387056

...


I'll do more tests tomorrow.


	-ss