linux-kernel - Re: [LKP] [lkp] [mm, oom] faad2185f4: vm-scalability.throughput -11.8% regression

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Date:	Fri, 29 Apr 2016 20:54:13 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	kernel test robot <xiaolong.ye@...el.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>, lkp@...org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [LKP] [lkp] [mm, oom] faad2185f4: vm-scalability.throughput
 -11.8% regression

On Fri, Apr 29, 2016 at 11:29:36AM +0200, Michal Hocko wrote:
> On Fri 29-04-16 16:59:37, Aaron Lu wrote:
> > On Thu, Apr 28, 2016 at 01:21:35PM +0200, Michal Hocko wrote:
> > > All of them are order-2 and this was a known problem for "mm, oom:
> > > rework oom detection" commit and later should make it much more
> > > resistant to failures for higher (!costly) orders. So I would definitely
> > > encourage you to retest with the current _complete_ mmotm tree.
> > 
> > OK, will run the test on this branch:
> > https://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-4.5
> > with head commit:
> > commit 81cc2e6f1e8bd81ebc7564a3cd3797844ee1712e
> > Author: Michal Hocko <mhocko@...e.com>
> > Date:   Thu Apr 28 12:03:24 2016 +0200
> > 
> >     drm/amdgpu: make amdgpu_mn_get wait for mmap_sem killable
> > 
> > Please let me know if this isn't right.
> 
> Yes that should contain all the oom related patches in the mmotm tree.

The test shows commit 81cc2e6f1e doesn't OOM anymore and its throughput 
is 43609, the same level compared to 43802, so everyting is fine :-)