linux-kernel - Re: [RFC][PATCH v3 0/10] memcg async reclaim

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Date:	Fri, 27 May 2011 12:05:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Ying Han <yinghan@...gle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH v3 0/10] memcg async reclaim

On Fri, 27 May 2011 11:48:37 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Thu, 26 May 2011 18:49:26 -0700
> Ying Han <yinghan@...gle.com> wrote:
 
> > Hmm.. I noticed a very strange behavior on a simple test w/ the patch set.
> > 
> > Test:
> > I created a 4g memcg and start doing cat. Then the memcg being OOM
> > killed as soon as it reaches its hard_limit. We shouldn't hit OOM even
> > w/o async-reclaim.
> > 
> > Again, I will read through the patch. But like to post the test result first.
> > 
> > $ echo $$ >/dev/cgroup/memory/A/tasks
> > $ cat /dev/cgroup/memory/A/memory.limit_in_bytes
> > 4294967296
> > 
> > $ time cat /export/hdc3/dd_A/tf0 > /dev/zero
> > Killed
> > 
> > real	0m53.565s
> > user	0m0.061s
> > sys	0m4.814s
> > 
> 
> Hmm, what I see is
> ==
> root@...extal kamezawa]# ls -l test/1G
> -rw-rw-r--. 1 kamezawa kamezawa 1053261824 May 13 13:58 test/1G
> [root@...extal kamezawa]# mkdir /cgroup/memory/A
> [root@...extal kamezawa]# echo 0 > /cgroup/memory/A/tasks
> [root@...extal kamezawa]# echo 300M > /cgroup/memory/A/memory.limit_in_bytes
> [root@...extal kamezawa]# echo 1 > /cgroup/memory/A/memory.async_control
> [root@...extal kamezawa]# cat test/1G > /dev/null
> [root@...extal kamezawa]# cat /cgroup/memory/A/memory.reclaim_stat
> recent_scan_success_ratio 83
> limit_scan_pages 82
> limit_freed_pages 49
> limit_elapsed_ns 242507
> soft_scan_pages 0
> soft_freed_pages 0
> soft_elapsed_ns 0
> margin_scan_pages 218630
> margin_freed_pages 181598
> margin_elapsed_ns 117466604
> [root@...extal kamezawa]#
> ==
> 
> I'll turn off swapaccount and try again.
> 

A bug found....I added memory.async_control file to memsw.....file set by mistake.
Then, async_control cannot be enabled when swapaccount=0. I'll fix that.

So, how do you enabled async_control ?

Thanks,
-Kame



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