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

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Date:	Fri, 06 Mar 2009 08:47:31 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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)

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