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Date:	Thu, 26 May 2011 21:34:31 -0700
From:	Ying Han <yinghan@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"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 Thu, May 26, 2011 at 8:05 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> 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.

Yes, i have that changed in my previous testing
>
> So, how do you enabled async_control ?

$ echo 1 >/dev/cgroup/memory/D/memory.async_control

?

--Ying
>
> Thanks,
> -Kame
>
>
>
>
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