From: Nicolas Pitre <nico@cam.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Ingo Molnar <mingo@elte.hu>,
David Woodhouse <dwmw2@infradead.org>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
lkml <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
Arjan van de Ven <arjanv@infradead.org>,
Steven Rostedt <rostedt@goodmis.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Christoph Hellwig <hch@infradead.org>, Andi Kleen <ak@suse.de>,
David Howells <dhowells@redhat.com>,
Alexander Viro <viro@parcelfarce.linux.theplanet.co.uk>,
Oleg Nesterov <oleg@tv-sign.ru>, Paul Jackson <pj@sgi.com>
Subject: Re: [patch 04/15] Generic Mutex Subsystem, add-atomic-call-func-x86_64.patch
Date: Tue, 20 Dec 2005 09:35:07 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.64.0512200927450.26663@localhost.localdomain> (raw)
In-Reply-To: <43A81132.8040703@yahoo.com.au>
On Wed, 21 Dec 2005, Nick Piggin wrote:
> Nicolas Pitre wrote:
> > On Tue, 20 Dec 2005, Nick Piggin wrote:
>
> > > Considering that on UP, the arm should not need to disable interrupts
> > > for this function (or has someone refuted Linus?), how about:
> >
> >
> > Kernel preemption.
> >
>
> preempt_disable() ?
Sure, and we're now more costly than the current implementation with irq
disabling.
If we go with simple mutexes that's because there is a gain, even a huge
one on ARM, especially for the fast uncontended case. If you guys
insist on making things so generic and rigid then there is no gain
anymore worth the bother.
Nicolas
next prev parent reply other threads:[~2005-12-20 14:35 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 [this message]
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
2005-12-20 4:29 ` Ingo Molnar
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