linux-kernel - Re: [RFC][PATCH 0/4] Memory controller soft limit patches

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Message-ID: <20090107185627.GL4145@linux.vnet.ibm.com>
Date:	Thu, 8 Jan 2009 00:26:27 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][PATCH 0/4] Memory controller soft limit patches

On Thu, Jan 08, 2009 at 12:11:10AM +0530, Balbir Singh wrote:
> 
> Here is v1 of the new soft limit implementation. Soft limits is a new feature
> for the memory resource controller, something similar has existed in the
> group scheduler in the form of shares. We'll compare shares and soft limits
> below. I've had soft limit implementations earlier, but I've discarded those
> approaches in favour of this one.
> 
> Soft limits are the most useful feature to have for environments where
> the administrator wants to overcommit the system, such that only on memory
> contention do the limits become active. The current soft limits implementation
> provides a soft_limit_in_bytes interface for the memory controller and not
> for memory+swap controller. The implementation maintains an RB-Tree of groups
> that exceed their soft limit and starts reclaiming from the group that
> exceeds this limit by the maximum amount.
> 
> This is an RFC implementation and is not meant for inclusion
> 
> TODOs
> 
> 1. The shares interface is not yet implemented, the current soft limit
>    implementation is not yet hierarchy aware. The end goal is to add
>    a shares interface on top of soft limits and to maintain shares in
>    a manner similar to the group scheduler

Just to clarify, when there is no contention, you want to share memory
proportionally?

thanks,
-- 
regards,
Dhaval
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