linux-kernel - Re: [RESEND][PATCH] Mark thread stack correctly in proc/<pid>/maps

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Message-ID: <CAAHN_R13iFpMQLPDM8y9gTjf+QdiO61LU_HVkUronrOBZRJvTA@mail.gmail.com>
Date:	Fri, 3 Feb 2012 15:19:42 +0530
From:	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Jamie Lokier <jamie@...reable.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-man@...r.kernel.org
Subject: Re: [RESEND][PATCH] Mark thread stack correctly in proc/<pid>/maps

On Fri, Feb 3, 2012 at 1:31 PM, KOSAKI Motohiro
<kosaki.motohiro@...il.com> wrote:
> The fact is, now process stack and pthread stack clearly behave
> different dance. libc don't expect pthread stack grow automatically.
> So, your patch will break userland. Just only change display thing.

Thanks for your feedback. This attempt was to unify this behaviours,
but I guess you're right; I need to check if glibc really has a
problem with this than assuming that it should not. I will check with
glibc maintainers on this and update here. Since this flag is
specifically for glibc, it should not affect other applications or
libraries.

The proc changes won't make sense without the change to mark thread
stacks unless we create yet another vm flag to reflect MAP_STACK in
the vma and then use that for both process and its threads. I'll
submit a patch with this (if acceptable of course) if glibc strictly
requires fixed sized stacks.

-- 
Siddhesh Poyarekar
http://siddhesh.in
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