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

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Message-Id: <20090108093700.2ad10d85.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 8 Jan 2009 09:37:00 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	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>
Subject: Re: [RFC][PATCH 0/4] Memory controller soft limit patches

On Thu, 8 Jan 2009 00:26:27 +0530
Dhaval Giani <dhaval@...ux.vnet.ibm.com> wrote:

> 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?
> 
I don't like to add "share" as the kernel interface of memcg.
We used "bytes" to do (hard) limit. Please just use "bytes".

Thanks,
-Kame

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