linux-kernel - Re: [PATCH, RFC] mm: Implement RLIMIT

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Date:	Thu, 13 Jun 2013 17:57:32 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Jörn Engel <joern@...fs.org>
Cc:	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH, RFC] mm: Implement RLIMIT_RSS

Hey Jörn,

On Tue, Jun 11, 2013 at 05:53:20PM -0400, Jörn Engel wrote:
> On Tue, 11 June 2013 17:16:01 -0400, Johannes Weiner wrote:
> > On Tue, Jun 11, 2013 at 02:29:21PM -0400, Jörn Engel wrote:
> > > I've seen a couple of instances where people try to impose a vsize
> > > limit simply because there is no rss limit in Linux.  The vsize limit
> > > is a horrible approximation and even this patch seems to be an
> > > improvement.
> > > 
> > > Would there be strong opposition to actually supporting RLIMIT_RSS?
> > 
> > This is trivial to exploit by creating the mappings first and
> > populating them later, so while it may cover some use cases, it does
> > not have the protection against malicious programs aspect that all the
> > other rlimits have.
> 
> Hm.  The use case I have is that an application wants to limit itself.
> It is effectively a special assert to catch memory leaks and the like.
> So malicious programs are not my immediate concern.

Just out of curisoity.

It means you already know the max rss of the application in advance
so you can use taskstats's hiwater_rss if you don't need to catch
the moment which rss is over the limit.

-- 
Kind regards,
Minchan Kim
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