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

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Message-ID: <20160429130055.GN21977@dhcp22.suse.cz>
Date:	Fri, 29 Apr 2016 15:00:55 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Aaron Lu <aaron.lu@...el.com>
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 29-04-16 20:54:13, Aaron Lu wrote:
> 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 :-)

Thanks a lot for double checking! This is highly appreciated!
-- 
Michal Hocko
SUSE Labs