From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Andrew Morton <akpm@osdl.org>, Andi Kleen <ak@suse.de>,
Laurent Riffard <laurent.riffard@free.fr>,
Arjan van de Ven <arjan@infradead.org>,
Kernel development list <linux-kernel@vger.kernel.org>,
Jeremy Fitzhardinge <jeremy@xensource.com>
Subject: Re: 2.6.18-rc6-mm1: GPF loop on early boot
Date: Mon, 11 Sep 2006 00:59:39 -0700 [thread overview]
Message-ID: <4505176B.6030803@goop.org> (raw)
In-Reply-To: <20060911073649.GA3188@elte.hu>
Ingo Molnar wrote:
> yes - but loading a null selector is a special-case: you dont have to
> invalidate/reload the shadow, you just have to turn access off. This
> might or might not make a difference on modern CPUs (it makes a
> difference with older CPUs) - but it's worth a try nevertheless. You
> measured a 9 cycles degradation with the %gs method, we could recover
> some of that.
>
It's a worthwhile experiment. The gain would be the NULL selector load,
but the loss would be an additional segment reload on context switch and
TLS ABI incompatibility (which is more difficult to quantify).
First step is to make sure the PDA is set up before hitting C code...
J
next prev parent reply other threads:[~2006-09-11 7:59 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-08 8:13 2.6.18-rc6-mm1 Andrew Morton
2006-09-08 11:49 ` 2.6.18-rc6-mm1 Andy Whitcroft
2006-09-08 12:07 ` 2.6.18-rc6-mm1 Frederik Deweerdt
2006-09-08 12:16 ` [patch -mm] s390: fix save_stack_trace Heiko Carstens
2006-09-09 13:36 ` Andi Kleen
2006-09-08 12:23 ` 2.6.18-rc6-mm1 - x86_64-mm-lockdep-dont-force-framepointer.patch Heiko Carstens
2006-09-09 13:39 ` Andi Kleen
2006-09-11 8:45 ` Martin Schwidefsky
2006-09-08 14:26 ` 2.6.18-rc6-mm1 Rafael J. Wysocki
2006-09-08 20:44 ` [linux-usb-devel] 2.6.18-rc6-mm1 Alan Stern
2006-09-08 22:57 ` Rafael J. Wysocki
2006-09-11 22:08 ` Rafael J. Wysocki
2006-09-12 14:28 ` Alan Stern
2006-09-12 17:22 ` Mattia Dongili
2006-09-12 18:04 ` Mattia Dongili
2006-09-12 20:10 ` Alan Stern
2006-09-13 17:00 ` Rafael J. Wysocki
2006-09-13 12:07 ` [linux-usb-devel] 2.6.18-rc6-mm1 (-mm2): ohci resume problem Rafael J. Wysocki
2006-09-13 12:42 ` Rafael J. Wysocki
2006-09-13 18:38 ` Alan Stern
2006-09-13 20:00 ` Rafael J. Wysocki
2006-09-13 21:01 ` Alan Stern
2006-09-13 21:32 ` Rafael J. Wysocki
2006-09-13 21:55 ` Alan Stern
2006-09-14 13:14 ` Rafael J. Wysocki
2006-09-14 14:08 ` Rafael J. Wysocki
2006-09-14 15:04 ` Alan Stern
2006-09-14 16:17 ` Alan Stern
2006-09-14 17:08 ` Rafael J. Wysocki
2006-09-14 17:13 ` Rafael J. Wysocki
2006-09-14 17:24 ` Alan Stern
2006-09-14 17:22 ` Alan Stern
2006-09-14 17:35 ` Rafael J. Wysocki
2006-09-14 18:28 ` Alan Stern
[not found] ` <200609142137.52066.rjw@sisk.pl>
2006-09-14 20:21 ` Rafael J. Wysocki
2006-09-14 20:55 ` Alan Stern
2006-09-14 21:47 ` Rafael J. Wysocki
2006-09-14 22:19 ` Alan Stern
2006-09-14 16:48 ` Rafael J. Wysocki
2006-09-13 20:38 ` Mattia Dongili
2006-09-13 20:54 ` Alan Stern
2006-09-14 20:19 ` Mattia Dongili
2006-09-14 20:25 ` Alan Stern
2006-09-14 20:35 ` Mattia Dongili
2006-09-16 11:58 ` Mattia Dongili
2006-09-16 14:31 ` Alan Stern
2006-09-08 17:43 ` 2.6.18-rc6-mm1 Stefan Richter
2006-09-08 18:04 ` 2.6.18-rc6-mm1 Andrew Morton
2006-09-08 18:36 ` 2.6.18-rc6-mm1 Stefan Richter
2006-09-08 19:23 ` 2.6.18-rc6-mm1 Michal Piotrowski
2006-09-08 19:43 ` 2.6.18-rc6-mm1 Andrew Morton
2006-09-08 20:01 ` 2.6.18-rc6-mm1 Michal Piotrowski
2006-09-08 19:30 ` 2.6.18-rc6-mm1 thunder7
2006-09-08 19:44 ` 2.6.18-rc6-mm1 Andrew Morton
2006-09-09 9:04 ` 2.6.18-rc6-mm1 thunder7
2006-09-09 15:31 ` 2.6.18-rc6-mm1 Andrew Morton
2006-09-09 22:02 ` 2.6.18-rc6-mm1 Jean Delvare
2006-09-10 6:30 ` 2.6.18-rc6-mm1 thunder7
2006-09-09 8:35 ` lockdep warning in check_flags() Frederik Deweerdt
2006-09-11 5:43 ` Ingo Molnar
2006-09-12 14:13 ` Frederik Deweerdt
2006-09-12 16:54 ` Ingo Molnar
2006-09-12 20:21 ` Frederik Deweerdt
[not found] ` <4503DC64.9070007@free.fr>
2006-09-10 8:32 ` 2.6.18-rc6-mm1: GPF loop on early boot Andi Kleen
2006-09-10 10:29 ` Arjan van de Ven
2006-09-10 11:57 ` Ingo Molnar
2006-09-10 11:34 ` Andi Kleen
2006-09-10 13:26 ` Ingo Molnar
2006-09-10 13:55 ` Andi Kleen
2006-09-10 14:02 ` Ingo Molnar
2006-09-10 16:33 ` Andrew Morton
2006-09-10 23:03 ` Jeremy Fitzhardinge
2006-09-11 5:10 ` Ingo Molnar
2006-09-11 7:31 ` Jeremy Fitzhardinge
2006-09-11 7:29 ` Ingo Molnar
2006-09-11 7:41 ` Jeremy Fitzhardinge
2006-09-11 7:36 ` Ingo Molnar
2006-09-11 7:59 ` Jeremy Fitzhardinge [this message]
2006-09-11 8:01 ` Ingo Molnar
2006-09-11 8:13 ` Jeremy Fitzhardinge
2006-09-11 7:38 ` Ingo Molnar
2006-09-11 7:56 ` Jeremy Fitzhardinge
2006-09-11 7:55 ` Ingo Molnar
2006-09-11 5:21 ` Laurent Riffard
2006-09-11 5:18 ` Ingo Molnar
2006-09-11 5:25 ` [patch] i386-PDA, lockdep: fix %gs restore Ingo Molnar
2006-09-11 5:41 ` Andi Kleen
2006-09-11 5:48 ` Ingo Molnar
2006-09-11 5:46 ` Ingo Molnar
2006-09-11 16:35 ` Laurent Riffard
2006-09-11 7:42 ` Jeremy Fitzhardinge
2006-09-11 19:33 ` Jeremy Fitzhardinge
2006-09-11 21:25 ` Jeremy Fitzhardinge
2006-09-11 20:20 ` Andi Kleen
2006-09-11 21:37 ` Jeremy Fitzhardinge
2006-09-11 20:48 ` Andi Kleen
2006-09-10 12:36 ` 2.6.18-rc6-mm1: GPF loop on early boot Laurent Riffard
2006-09-10 13:07 ` Ingo Molnar
2006-09-10 13:11 ` Ingo Molnar
2006-09-11 21:19 ` 2.6.18-rc6-mm1 Mark Haverkamp
2006-09-11 22:16 ` 2.6.18-rc6-mm1 Andrew Morton
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