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 01:13:25 -0700 [thread overview]
Message-ID: <45051AA5.6090102@goop.org> (raw)
In-Reply-To: <20060911080115.GB5328@elte.hu>
Ingo Molnar wrote:
> the ratio between the number of syscalls vs. the number of context
> switches is 1-2 orders of magnitude. So a loss of 9 cycles in the
> syscall path is roughly equal to a loss of 90-900 cycles in switch_to()
> costs ...
>
I agree.
> the TLS ABI is just a gcc stupidity. Why did they pick the _second_
> extra selector, instead of the first one ...?
Well, it doesn't matter which they chose if its the same for user and
kernel space. Why does x86-64 have swapgs rather than swapfs?
> Anyway, perhaps this could
> be solved by extending gcc with a switch to also generate __thread code
> off %fs. Probably not worth the pain though ...
If there's gcc hacking to be done, it would be trying to get it make the
TLS offsets from the PDA/TCB positive rather than negative...
J
next prev parent reply other threads:[~2006-09-11 8:13 UTC|newest]
Thread overview: 103+ 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 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
2006-09-10 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
2006-09-11 8:01 ` Ingo Molnar
2006-09-11 8:13 ` Jeremy Fitzhardinge [this message]
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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