linux-kernel - Re: [RFC][PATCH] memcg soft limit (yet another new design) v1

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Message-ID: <fe5dec67977261684809e4fb7a63dbc1.squirrel@webmail-b.css.fujitsu.com>
Date:	Thu, 2 Apr 2009 00:11:11 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [RFC][PATCH] memcg soft limit (yet another new design) v1

Balbir Singh wrote:
>> ==brief test result==
>> On 2CPU/1.6GB bytes machine. create group A and B
>>   A.  soft limit=300M
>>   B.  no soft limit
>>
>>   Run a malloc() program on B and allcoate 1G of memory. The program
>> just
>>   sleeps after allocating memory and no memory refernce after it.
>>   Run make -j 6 and compile the kernel.
>>
>>   When vm.swappiness = 60  => 60MB of memory are swapped out from B.
>>   When vm.swappiness = 10  => 1MB of memory are swapped out from B
>>
>>   If no soft limit, 350MB of swap out will happen from B.(swapiness=60)
>>
>
> I did some brief functionality tests and the results are far better
> than the previous versions of the patch. Both my v7 (with some minor
> changes) and this patchset seem to do well functionally. Time to do
> some more exhaustive tests. Any results from your end?
>
Grad to hear that.

Seems good result under several simple tests after fixing
inactive_anon_is_low(). But needed some fixes for corner cases,
add hook to uncharge, hook to cpu hotplug, etc....and making codes
slim, tuning parameters to make more sense. (or adding comments.)

I wonder whether it's convenient to post v2 before new mmotm.
(mmotm includes some fixes around memcg/vmscan.)
I'll continue test (hopefully more complicated cases on big machine.)

Anyway, I often update patch to v5 or more before posting final ones ;)

Thanks,
-Kame



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