From: Ingo Molnar <mingo@elte.hu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Daniel Walker <dwalker@mvista.com>,
Esben Nielsen <simlo@phys.au.dk>,
linux-kernel@vger.kernel.org, sdietrich@mvista.com
Subject: Re: [PATCH] local_irq_disable removal
Date: Sun, 12 Jun 2005 08:57:33 +0200 [thread overview]
Message-ID: <20050612065733.GA6997@elte.hu> (raw)
In-Reply-To: <1118533485.13312.91.camel@tglx.tec.linutronix.de>
* Thomas Gleixner <tglx@linutronix.de> wrote:
> On Sat, 2005-06-11 at 13:51 -0700, Daniel Walker wrote:
> > On Sat, 11 Jun 2005, Ingo Molnar wrote:
>
> > Interesting .. So "cli" takes 7 cycles , "sti" takes 7 cycles. The current
> > method does "lea" which takes 1 cycle, and "or" which takes 1 cycle. I'm
> > not sure if there is any function call overhead .. So the soft replacment
> > of cli/sti is 70% faster on a per instruction level .. So it's at least
> > not any slower .. Does everyone agree on that?
>
> No, because x86 is not the whole universe
x86 is actually a 'worst-case', because it has one of the cheapest CPU
level cli/sti implementations. Usually it's the hard-local_irq_disable()
overhead on non-x86 platforms that is a problem. (ARM iirc) So in this
sense the soft-flag should be a win on most sane architectures.
Ingo
next prev parent reply other threads:[~2005-06-12 6:58 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-08 7:08 [PATCH] local_irq_disable removal Daniel Walker
2005-06-08 11:21 ` Ingo Molnar
2005-06-08 20:33 ` Daniel Walker
2005-06-09 11:56 ` Ingo Molnar
2005-06-10 23:37 ` Esben Nielsen
2005-06-11 0:20 ` Daniel Walker
2005-06-11 13:13 ` Esben Nielsen
2005-06-11 13:46 ` Ingo Molnar
2005-06-11 14:32 ` Esben Nielsen
2005-06-11 16:36 ` Daniel Walker
2005-06-11 17:26 ` Thomas Gleixner
2005-06-11 18:40 ` Sven-Thorsten Dietrich
2005-06-12 0:07 ` Thomas Gleixner
2005-06-12 0:15 ` Sven-Thorsten Dietrich
2005-06-12 0:22 ` Thomas Gleixner
2005-06-12 0:24 ` Sven-Thorsten Dietrich
2005-06-11 19:16 ` Ingo Molnar
2005-06-11 19:34 ` Esben Nielsen
2005-06-11 19:44 ` Sven-Thorsten Dietrich
2005-06-11 19:53 ` Daniel Walker
2005-06-11 20:23 ` Esben Nielsen
2005-06-11 22:59 ` Sven-Thorsten Dietrich
2005-06-13 5:22 ` Steven Rostedt
2005-06-13 6:20 ` Sven-Thorsten Dietrich
2005-06-13 12:28 ` Steven Rostedt
2005-06-11 20:03 ` Ingo Molnar
2005-06-11 20:51 ` Daniel Walker
2005-06-11 23:44 ` Thomas Gleixner
2005-06-11 23:50 ` Daniel Walker
2005-06-12 0:01 ` Thomas Gleixner
2005-06-12 0:09 ` Sven-Thorsten Dietrich
2005-06-12 0:28 ` Thomas Gleixner
2005-06-12 1:05 ` Gene Heskett
2005-06-13 12:03 ` Paulo Marques
2005-06-13 12:19 ` Esben Nielsen
2005-06-12 4:50 ` cutaway
2005-06-12 6:57 ` Ingo Molnar [this message]
2005-06-12 11:15 ` Esben Nielsen
2005-06-12 11:52 ` Ingo Molnar
2005-06-13 7:01 ` Sven-Thorsten Dietrich
2005-06-13 7:53 ` Esben Nielsen
2005-06-13 8:05 ` Sven-Thorsten Dietrich
2005-06-13 8:54 ` Esben Nielsen
2005-06-13 9:13 ` Ingo Molnar
2005-06-12 15:28 ` Daniel Walker
2005-06-12 4:31 ` Karim Yaghmour
2005-06-12 4:32 ` Daniel Walker
2005-06-12 4:56 ` Karim Yaghmour
2005-06-12 4:55 ` Daniel Walker
2005-06-12 5:16 ` Karim Yaghmour
2005-06-12 5:14 ` Daniel Walker
2005-06-12 5:27 ` Karim Yaghmour
2005-06-12 15:27 ` Zwane Mwaikambo
2005-06-12 15:46 ` Daniel Walker
2005-06-12 19:02 ` Ingo Molnar
2005-06-12 17:02 ` Andi Kleen
2005-06-13 7:08 ` Sven-Thorsten Dietrich
2005-06-13 7:44 ` Esben Nielsen
2005-06-13 7:53 ` Sven-Thorsten Dietrich
2005-06-13 7:56 ` Ingo Molnar
2005-06-13 7:47 ` Ingo Molnar
2005-06-11 16:41 ` Sven-Thorsten Dietrich
2005-06-11 17:16 ` Esben Nielsen
2005-06-11 19:29 ` Sven-Thorsten Dietrich
2005-06-11 20:02 ` Sven-Thorsten Dietrich
2005-06-11 16:19 ` Daniel Walker
2005-06-11 13:51 ` Ingo Molnar
2005-06-11 15:00 ` Mika Penttilä
2005-06-11 16:45 ` Sven-Thorsten Dietrich
2005-06-11 16:53 ` Mika Penttilä
2005-06-11 17:13 ` Daniel Walker
2005-06-11 17:22 ` Mika Penttilä
2005-06-11 17:25 ` Daniel Walker
2005-06-11 17:29 ` Mika Penttilä
2005-06-11 17:30 ` Daniel Walker
2005-06-11 17:55 ` Mika Penttilä
2005-06-11 16:28 ` Daniel Walker
2005-06-11 16:46 ` Esben Nielsen
2005-06-11 16:09 ` Daniel Walker
2005-06-11 16:31 ` Esben Nielsen
2005-06-11 16:51 ` Christoph Hellwig
2005-06-11 22:44 ` Ed Tomlinson
2005-06-12 6:23 ` Ingo Molnar
2005-06-12 9:28 ` Christoph Hellwig
2005-06-13 4:39 ` [RT] " Steven Rostedt
2005-06-16 5:35 ` Lee Revell
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