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

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Date:	Fri, 29 Apr 2016 16:59:37 +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 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.