linux-kernel - Re: [PATCH RFC 3/3] x86: use mwait for trigger API

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

On Sat, 16 Aug 2008 09:34:26 -0700
Jeremy Fitzhardinge <jeremy@...p.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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