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

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Date:	Mon, 9 Mar 2009 08:44:04 +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:

> KAMEZAWA Hiroyuki wrote:
> > From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thank you. (and sorry
-Kame

> > 
> > Documentation for softlimit (3/3)
> > 
> > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > ---
> >  Documentation/cgroups/memory.txt |   19 +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> > 
> > Index: mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt
> > ===================================================================
> > --- mmotm-2.6.29-Mar3.orig/Documentation/cgroups/memory.txt
> > +++ mmotm-2.6.29-Mar3/Documentation/cgroups/memory.txt
> > @@ -322,6 +322,25 @@ will be charged as a new owner of it.
> >    - a cgroup which uses hierarchy and it has child cgroup.
> >    - a cgroup which uses hierarchy and not the root of hierarchy.
> >  
> > +5.4 softlimit
> > +  Memory cgroup supports softlimit and has 2 params for control.
> 
>                                                 parameters
> 
> > +    - memory.softlimit_in_bytes
> > +	- softlimit to this cgroup.
>          softlimit for this cgroup
> 		(i.e., no beginning '-' and no ending '.')
> 
> 
> > +    - memory.softlimit_priority.
> > +	- priority of this cgroup at softlimit reclaim.
> 	 priority of this cgroup at softlimit reclaim
> 
> > +	  Allowed priority level is 3-0 and 3 is the lowest.
> 
> 	Not very user friendly...
> 
> > +	  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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