From: Ingo Molnar <mingo@elte.hu>
To: Nicolas Pitre <nico@cam.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjanv@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
David Howells <dhowells@redhat.com>
Subject: Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
Date: Wed, 21 Dec 2005 07:26:23 +0100 [thread overview]
Message-ID: <20051221062623.GB32711@elte.hu> (raw)
In-Reply-To: <Pine.LNX.4.64.0512202304580.26663@localhost.localdomain>
* Nicolas Pitre <nico@cam.org> wrote:
> > Please consider using (a variant of) xchg() instead. Although
> > atomic_dec() is available on all architectures, its implementation is
> > far from being the most efficient thing to do for them all.
>
> Actually, the best thing to do is to let the architecture do what is
> the most efficient. [...]
i have already added something similar. Furthermore, i have also
eliminated the CMPXCHG requirement from MUTEX_FASTPATH, which should
open ARM up to the generic lockless fastpath. (but you can still choose
to reimplement it in the architecture) I'll send a new queue later
today.
Ingo
next prev parent reply other threads:[~2005-12-21 6:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-19 1:35 Ingo Molnar
2005-12-19 17:49 ` Zwane Mwaikambo
2005-12-19 20:58 ` David Woodhouse
2005-12-20 4:31 ` Ingo Molnar
2005-12-20 6:30 ` Nicolas Pitre
2005-12-20 8:12 ` Nick Piggin
2005-12-20 14:10 ` Nicolas Pitre
2005-12-20 14:12 ` Nick Piggin
2005-12-20 14:35 ` Nicolas Pitre
2005-12-20 15:05 ` Nick Piggin
2005-12-20 16:35 ` Nicolas Pitre
2005-12-20 19:20 ` Russell King
2005-12-20 19:32 ` Arjan van de Ven
2005-12-20 19:37 ` Russell King
2005-12-20 19:59 ` Nicolas Pitre
2005-12-20 19:43 ` Steven Rostedt
2005-12-20 19:57 ` Russell King
2005-12-20 20:35 ` Horst von Brand
2005-12-20 19:55 ` Nicolas Pitre
2005-12-20 18:27 ` Linus Torvalds
2005-12-20 19:34 ` Russell King
2005-12-20 20:10 ` Linus Torvalds
2005-12-20 21:18 ` Nicolas Pitre
2005-12-20 22:04 ` Linus Torvalds
2005-12-20 22:19 ` Steven Rostedt
2005-12-20 22:43 ` Nicolas Pitre
2005-12-21 6:00 ` Ingo Molnar
2005-12-21 2:12 ` Nick Piggin
2005-12-20 19:49 ` Nicolas Pitre
2005-12-20 18:25 ` Linus Torvalds
2005-12-21 6:20 ` Ingo Molnar
2005-12-21 4:16 ` Nicolas Pitre
2005-12-21 6:26 ` Ingo Molnar [this message]
2005-12-20 4:29 ` Ingo Molnar
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