linux-kernel - Re: [PATCH 4/6] x86/cpufreq: use cpumask

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Message-Id: <200906111204.48441.rusty@rustcorp.com.au>
Date:	Thu, 11 Jun 2009 12:04:47 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Langsdorf, Mark" <mark.langsdorf@....com>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Yinghai Lu" <yinghai@...nel.org>, "Avi Kivity" <avi@...hat.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	"Dave Jones" <davej@...hat.com>, cpufreq@...r.kernel.org
Subject: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =

On Thu, 11 Jun 2009 05:12:16 am Langsdorf, Mark wrote:
> > powernow_k8_target is problematic: it grabs a mutex.  cpufreq
> > people, is this called often?
>
> Yes.  It's the function that makes a frequency change
> happen, so 5+ times per second per core isn't
> unreasonable.

Right, so we need to revisit this.  I'll leave it for the moment and put it on 
my TODO list.

Thanks,
Rusty.
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