linux-kernel - Re: [RFC] How to handle the rules engine for cgroups

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Message-ID: <486D963E.60202@cn.fujitsu.com>
Date:	Fri, 04 Jul 2008 11:17:18 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Libcg Devel Mailing List <libcg-devel@...ts.sourceforge.net>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Paul Menage <menage@...gle.com>,
	Peter Zijlstra <pzijlstr@...hat.com>,
	Kazunaga Ikeno <k-ikeno@...jp.nec.com>,
	Morton Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Graf <tgraf@...hat.com>, Rik Van Riel <riel@...hat.com>
Subject: Re: [RFC] How to handle the rules engine for cgroups

>> Because "a child inherits parent's" rule is very strong, I think the amount
>> of events we have to check is much less than we get report. Can't we add some
>> filter/assumption here ?
>>
> 
> I am not sure if proc connector currently allows filtering of various
> events like fork, exec, exit etc. In a quick look it looks like it
> does not. But probably that can be worked out. Even then, it will just
> help reduce the number of messages queued for user space on that socket
> but will not take away the fact that messages can be dropped under
> memory pressure. 
> 

Proc connector doesn't support event filtering. We can easily add a
global event mask, but not straightforward to add per-socket event mask
if not impossible.

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