Message-ID: <1282406337.4c6ff7c1533ad@imp.free.fr>
Date: Sat, 21 Aug 2010 17:58:57 +0200
From: castet.matthieu@free.fr
To: linux-kernel@vger.kernel.org
Subject: is VM_GROWSDOWN still useful
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7BIT
User-Agent: Internet Messaging Program (IMP) 3.2.8
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 757
Lines: 21

Hi,

I am wondering if the flags GROWSDOWN/GROWSUP is still useful on linux today. It
is only used for the main thread stack.
Stack allocated by pthread doesn't use anymore GROWSDOWN because you can't
guaranty that a user mapping (via mmap) will collide with it.

Why not doing the same for the main thread : allocate a stack of the rlimit size
?

Linux memory allocation use over-commit, and physical memory will only be
allocated when the stack is really used.

Or are they real usage of GROWSDOWN ?

Matthieu
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/