linux-kernel - Re: [RFC][PATCH 3/3] memcg documenation soft limit (Yet Another One)

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Message-Id: <20090309084536.d5b1c110.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 9 Mar 2009 08:45:36 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Bharata B Rao <bharata@...ibm.com>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH 3/3] memcg documenation soft limit (Yet Another
 One)

On Fri, 06 Mar 2009 08:47:31 -0800
Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > +	  Allowed priority level is 3-0 and 3 is the lowest.
> 
> 	Not very user friendly...
> 
Ok, then, 0(lowest) - 8(highest) in the next version.

-Kame

> > +	  If 0, this cgroup will not be target of softlimit.
> > +
> > +  At memory shortage of the system (or local node/zone), softlimit helps
> > +  kswapd(), a global memory recalim kernel thread, and inform victim cgroup
> 
>                                reclaim                    informs
> 
> > +  to be shrinked to kswapd.
> > +
> > +  Victim selection logic:
> > +  The kernel searches from the lowest priroty(3) up to the highest(1).
> 
>                                          priority                     0 ?? (from above)
> 
> > +  If it find a cgroup witch has memory larger than softlimit, steal memory
> 
>            finds         which
> 
> > +  from it.
> > +  If multiple cgroups are on the same priority, each cgroup wil be a
> 
>                                                                will
> 
> > +  victim in turn.
> >  
> >  6. Hierarchy support
> 
> 
> -- 
> ~Randy
> 
> --
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