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Date: Thu, 15 Mar 2007 23:33:43 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Hugh Dickins <hugh@veritas.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Dan Aloni <da-x@monatomic.org>,
       linux-kernel@vger.kernel.org
Subject: Re: thread stacks and strict vm overcommit accounting
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> Stack RSS should certainly be included in Committed_AS,
> but RLIMIT_STACK merely limits how big the stack vma may grow to:
> at any moment the stack vma is probably very much smaller,
> and only its current size is accounted in Committed_AS.

With a typical size as a fuzz factor preaccounted in later kernels.

> > > Is this the intended behaviour?
> > 
> > That sounds like a bug to me.
> 
> I'm suspecting it's an oddity rather than a bug.

It is intended behaviour.