Re: [PATCH RFC 3/3] x86: use mwait for trigger API [LWN.net]

From:		Arjan van de Ven <arjan-AT-infradead.org>
To:		Jeremy Fitzhardinge <jeremy-AT-goop.org>
Subject:		Re: [PATCH RFC 3/3] x86: use mwait for trigger API
Date:		Sat, 16 Aug 2008 10:44:04 -0700
Message-ID:		<20080816104404.070e0c14@infradead.org>
Cc:		Ingo Molnar <mingo-AT-elte.hu>, Jens Axboe <jens.axboe-AT-oracle.com>, Peter Zijlstra <a.p.zijlstra-AT-chello.nl>, Christian Borntraeger <borntraeger-AT-de.ibm.com>, Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>, Rusty Russell <rusty-AT-rustcorp.com.au>
Archive-link:		Article, Thread

On Sat, 16 Aug 2008 09:34:26 -0700
Jeremy Fitzhardinge <jeremy@goop.org> wrote:

> If the cpu implements monitor/mwait, use it for the trigger API.
> 
> TODO: work out if any mwait hints are going to be useful here.

monitor/mwait is rather really expensive.. are we really sure we want
to use this?
(from an Intel cpu perspective the answer is very likely no; but I don't
know what AMD does here)

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