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

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Message-Id: <20090331155614.8ad0c9b2.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 31 Mar 2009 15:56:14 +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 12:19:02 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> > 
> > > > Nothing special boot options. My test was on VMware 2cpus/1.6GB memory.
> > > > 
> > > > I wonder why swapout can be 0 on your test. Do you add some extra hooks to
> > > > kswapd ?
> > > >
> > > 
> > > Nope.. no special hooks to kswapd. B never enters the RB-Tree and thus
> > > never hits the memcg soft limit reclaim path. kswapd can reclaim from
> > > it, but it grows back quickly.
> > Why grows back ? tasks in B sleeps ?
> 
> Since B continuously consumes memory
> 
Not sleep ?

In my test
 1. malloc 1GB and touch all and sleep in B. Wait until the memory usage in B
    goes up to 1024MB. This never wake up until 3. 
 2. run make in group A.
 3. kill malloc program.

Then why why continuously consumes memory ?

Thanks,
-Kame

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