From: Andi Kleen <ak@muc.de>
To: Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>
Subject: Re: serious performance regression due to NX patch
Date: 11 Jul 2004 14:43:07 +0200
Date: Sun, 11 Jul 2004 14:43:07 +0200 [thread overview]
Message-ID: <20040711124307.GA88881@muc.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0407110754280.26194@devserv.devel.redhat.com>
On Sun, Jul 11, 2004 at 07:56:10AM -0400, Ingo Molnar wrote:
>
> On Sun, 11 Jul 2004, Andi Kleen wrote:
>
> > > +#ifdef __i386__
> >
> > Won't do on x86-64.
>
> well on x86-64 'non-executable' really means non-executable, and always
> did, right? (and this is completely separate from the issue of whether the
> process stack is executable or not. This is about x86 that didnt enforce
> the vma's protection bit.)
Not quite - there is 32bit emulation. And the 64bit version also doesn't
do NX by default, but also relies on ELF header bits for this.
-Andi
next prev parent reply other threads:[~2004-07-11 12:43 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2giKE-67F-1@gated-at.bofh.it>
[not found] ` <2gIc8-6pd-29@gated-at.bofh.it>
[not found] ` <2gJ8a-72b-11@gated-at.bofh.it>
[not found] ` <2gJhY-776-21@gated-at.bofh.it>
2004-07-11 10:09 ` serious performance regression due to NX patch Andi Kleen
2004-07-11 11:56 ` Ingo Molnar
2004-07-11 12:43 ` Andi Kleen [this message]
[not found] ` <2gJrv-7kp-5@gated-at.bofh.it>
[not found] ` <2gLD2-qn-3@gated-at.bofh.it>
2004-07-11 13:38 ` Andi Kleen
2004-07-11 14:04 ` Matthew Wilcox
2004-07-10 5:28 David Mosberger
2004-07-11 8:38 ` Ingo Molnar
2004-07-11 9:39 ` Ingo Molnar
2004-07-11 9:52 ` Ingo Molnar
2004-07-11 10:02 ` Andrew Morton
2004-07-11 12:19 ` Matthew Wilcox
2004-07-11 10:22 ` Christoph Hellwig
2004-07-11 12:38 ` Jakub Jelinek
2004-07-12 18:08 ` Ingo Molnar
2004-07-12 18:24 ` Christoph Hellwig
2004-07-12 18:29 ` Ingo Molnar
2004-07-12 19:10 ` David Mosberger
2004-07-12 19:54 ` Ingo Molnar
2004-07-12 20:08 ` David Mosberger
2004-07-12 20:17 ` Linus Torvalds
2004-07-12 20:21 ` David Mosberger
2004-07-12 20:24 ` David Mosberger
2004-07-13 4:23 ` Ingo Molnar
2004-07-13 5:23 ` David Mosberger
2004-07-13 16:05 ` Mark Haverkamp
2004-07-13 16:49 ` Daniel McNeil
2004-07-17 0:06 ` David Mosberger
2004-07-17 1:39 ` Linus Torvalds
2004-07-17 4:37 ` David Mosberger
2004-07-13 3:58 ` Ingo Molnar
2004-07-17 0:35 ` David Mosberger
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