From: Ingo Molnar <mingo@elte.hu>
To: Sven-Thorsten Dietrich <sdietrich@mvista.com>
Cc: Esben Nielsen <simlo@phys.au.dk>,
Daniel Walker <dwalker@mvista.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] local_irq_disable removal
Date: Mon, 13 Jun 2005 09:56:35 +0200 [thread overview]
Message-ID: <20050613075635.GA16151@elte.hu> (raw)
In-Reply-To: <1118649197.5729.68.camel@sdietrich-xp.vilm.net>
* Sven-Thorsten Dietrich <sdietrich@mvista.com> wrote:
> > > Is there any such SMP concept as a local_preempt_disable() ?
> > >
> > You must think of preempt_disable() ? Except for the interface is a little
> > bit different using flags in local_irq_save(), preempt_disable() works
> > exactly the same way, blocking for everything but interrupts - on the
> > _local_ CPU. (Under PREEMPT_RT it ofcourse also blocks for threaded IRQ
> > handlers.)
>
> Doesn't preempt_disable() also block rescheduling on other CPUs?
>
> We only need to prevent rescheduling on THIS CPU.
it doesnt. It's 2-4 instructions similar to the assembly i posted
before, changing current_thread_info->preempt_count, nothing else.
Ingo
next prev parent reply other threads:[~2005-06-13 7:59 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
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 [this message]
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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