linux-kernel - Re: [RFC PATCH V2] Enforce RSS+Swap rlimit

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Message-ID: <4EC2FDA9.6050401@jp.fujitsu.com>
Date:	Tue, 15 Nov 2011 19:02:49 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	jmarchan@...hat.com
CC:	bsingharora@...il.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC PATCH V2] Enforce RSS+Swap rlimit

On 11/15/2011 8:10 AM, Jerome Marchand wrote:
> 
> Change since V1: rebase on 3.2-rc1
> 
> Currently RSS rlimit is not enforced. We can not forbid a process to exceeds
> its RSS limit and allow it swap out. That would hurts the performance of all
> system, even when memory resources are plentiful.
> 
> Therefore, instead of enforcing a limit on rss usage alone, this patch enforces
> a limit on rss+swap value. This is similar to memsw limits of cgroup.
> If a process rss+swap usage exceeds RLIMIT_RSS max limit, he received a SIGBUS
> signal. 

No good idea.
 - RLIMIT_RSS has clear definition and this patch break it. you should makes
   another rlimit at least.
 - SIGBUS can be ignored. rlimit shouldn't ignorable.


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