linux-kernel - Re: [RFC][PATCH 0/5] Memory controller soft limit patches (v9)

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Message-Id: <20090721090317.786141e9.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 21 Jul 2009 09:03:17 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	lizf@...fujitsu.com, linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC][PATCH 0/5] Memory controller soft limit patches (v9)

On Mon, 20 Jul 2009 21:18:59 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * Balbir Singh <balbir@...ux.vnet.ibm.com> [2009-07-10 18:29:50]:
> 
> > 
> > From: Balbir Singh <balbir@...ux.vnet.ibm.com>
> > 
> > New Feature: Soft limits for memory resource controller.
> > 
> > Here is v9 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. The CPU controllers interpretation
> > of shares is very different though. 
> > 
> > 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.
> > 
> > v9 attempts to address several review comments for v8 by Kamezawa, including
> > moving over to an event based approach for soft limit rb tree management,
> > simplification of data structure names and many others. Comments not
> > addressed have been answered via email or I've added comments in the code.
> > 
> > TODOs
> > 
> > 1. The current implementation maintains the delta from the soft limit
> >    and pushes back groups to their soft limits, a ratio of delta/soft_limit
> >    might be more useful
> > 
> 
> 
> Hi, Andrew,
> 
> Could you please pick up this patchset for testing in -mm, both
> Kamezawa-San and Kosaki-San have looked at the patches. I think they
> are ready for testing in mmotm.
> 
ok, plz go. But please consider to rewrite res_coutner related part in more
generic style, allowing mulitple threshold & callbacks without overheads.

Thanks,
-Kame


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