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

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Date:	Sat, 28 Mar 2009 23:41:00 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"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

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-03-27 13:59:33]:

> ==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 ran the same tests, booted the machine with mem=1700M and maxcpus=2

Here is what I see with

A has a swapout of 344M and B has not swapout at all, since B is
always under its soft limit. vm.swappiness is set to 60

I think the above is more along the lines of the expected functional behaviour. 

-- 
	Balbir
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