From: William Lee Irwin III <wli@holomorphy.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] flexible-mmap-2.6.7-D5
Date: Fri, 18 Jun 2004 16:16:31 -0700 [thread overview]
Message-ID: <20040618231631.GO1863@holomorphy.com> (raw)
In-Reply-To: <20040618213814.GA589@elte.hu>
On Fri, Jun 18, 2004 at 11:38:14PM +0200, Ingo Molnar wrote:
> the flexible-mmap-2.6.7-D5 patch (attached) splits the flexible-mmap
> layout stuff out of exec-shield. The patch is against 2.6.7 + my latest
> NX patch. (i've attached the NX patch too, for convenience.)
> the goal of the patch is to change the way virtual memory is allocated,
> from:
> 0x08000000 ... binary image
> 0x08xxxxxx ... brk area, grows upwards
> 0x40000000 ... start of mmap, new mmaps go after old ones
> 0xbfxxxxxx ... stack
> to a more flexible top-down mmap() method:
>
> 0x08000000 ... binary image
> 0x08xxxxxx ... brk area, grows upwards
> 0xbfxxxxxx ... _end_ of all mmaps, new mmaps go below old ones
> 0xbfyyyyyy ... stack
It may be useful to move STACK_TOP to 0x8040000 give the stack more head
room and fit small statically-linked executables into one pagetable page.
Otherwise the stack has very little headroom after the first mmap().
-- wli
next prev parent reply other threads:[~2004-06-18 23:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-18 21:38 [patch] flexible-mmap-2.6.7-D5 Ingo Molnar
2004-06-18 23:16 ` William Lee Irwin III [this message]
2004-06-19 7:46 ` Ingo Molnar
2004-06-19 8:34 ` William Lee Irwin III
2004-06-19 11:38 ` Ingo Molnar
2004-06-19 21:34 ` William Lee Irwin III
2004-06-19 8:06 ` Ingo Molnar
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