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Date: Thu, 15 Mar 2007 11:06:21 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Dan Aloni <da-x@monatomic.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: thread stacks and strict vm overcommit accounting
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> On Tue, 13 Mar 2007 18:33:20 +0200 Dan Aloni <da-x@monatomic.org> wrote:
> Hello,
> 
> This question is relevent to 2.6.20.
> 
> I noticed that if the RSS for the stack size is say, 8MB, running
> a single-threaded process doesn't incur an increase of 8MB to
> Committed_AS (/proc/meminfo).
> 
> However, on multi-threaded apps linked with pthread (on Debian
> Etch with 2.6.20 vanilla x86_64), every thread will incur the
> the specified maximum stack size RSS (assuming that you use
> the default attr). In other words, it appears that vm accounting
> works differently in that case.
> 
> Is this the intended behaviour?

That sounds like a bug to me.