linux-kernel - Re: [PATCH 1/1] Memory usage limit notification addition to memcg

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Message-Id: <20090713095209.d8b6e566.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 13 Jul 2009 09:52:09 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Vladislav D. Buzov" <vbuzov@...eddedalley.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Containers Mailing List 
	<containers@...ts.linux-foundation.org>,
	Dan Malek <dan@...eddedalley.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>, linux-mm@...ck.org
Subject: Re: [PATCH 1/1] Memory usage limit notification addition to memcg

On Wed, 08 Jul 2009 18:43:48 -0700
"Vladislav D. Buzov" <vbuzov@...eddedalley.com> wrote:

> KAMEZAWA Hiroyuki wrote:

> > 2 points.
> >  - Do we have to check this always we account ?
> >   
> What are the options? Every N pages? How to select N?
> 
I think you can reuse Balbir's softlimit event counter. (see v9.)


> > If this is true, "set limit" should be checked to guarantee this.
> > plz allow minus this for avoiding mess.
> Setting the memory controller cgroup limit and the notification
> threshold are two separate operations. There isn't any "mess," just some
> validation testing for reporting back to the source of the request. When
> changing the memory controller limit, we ensure the threshold limit is
> never allowed "negative." At most, the threshold limit will be equal the
> memory controller cgroup limit. Otherwise, the arithmetic and
> conditional tests during the operational part of the software becomes
> more complex, which we don't want.
> 
Hmm, then, plz this interface put under "set_limit_mutex".

Thanks,
-Kame

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