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

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Message-ID: <87fuu7iht0.fsf@yhuang-dev.intel.com>
Date:	Wed, 27 Apr 2016 16:20:43 +0800
From:	"Huang\, Ying" <ying.huang@...el.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	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>
Subject: Re: [LKP] [lkp] [mm, oom] faad2185f4: vm-scalability.throughput -11.8% regression

Michal Hocko <mhocko@...nel.org> writes:

> On Wed 27-04-16 11:15:56, kernel test robot wrote:
>> FYI, we noticed vm-scalability.throughput -11.8% regression with the following commit:
>
> Could you be more specific what the test does please?

The sub-testcase of vm-scalability is swap-w-rand.  An RAM emulated pmem
device is used as a swap device, and a test program will allocate/write
anonymous memory randomly to exercise page allocation, reclaiming, and
swapping in code path.

Best Regards,
Huang, Ying