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

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Message-Id: <20090331141140.9acd9b85.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 31 Mar 2009 14:11:40 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.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

On Tue, 31 Mar 2009 10:31:43 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2009-03-31 09:06:07]:
> 
> > On Sat, 28 Mar 2009 23:57:47 +0530
> > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> > 
> > > * Balbir Singh <balbir@...ux.vnet.ibm.com> [2009-03-28 23:41:00]:
> > > 
> > > > * 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
> > > 
> > > I meant to say, Here is what I see with my patches (v7)
> > > 
> > 
> > your malloc program is like this ?
> > 
> > int main(int argc, char *argv[])
> > {
> >     c = malloc(1G);
> >     memset(c, 0, 1G);
> >     getc();
> > }
> >
> 
> Very similar, instead of memset, we go integer by integer and set it
> to 0, do two loops of touching and wait for user input before exiting.
>  
Why two loops of touching ? has special meanings ?

-Kame


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