linux-kernel - Re: 2.6.21-rc6-mm1

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Message-Id: <20070411110659.d6ab6b39.akpm@linux-foundation.org>
Date:	Wed, 11 Apr 2007 11:06:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <ak@...e.de>
Cc:	eranian@....hp.com,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Adam Belay <abelay@...ell.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	randy.dunlap@...cle.com, lenb@...nel.org
Subject: Re: 2.6.21-rc6-mm1

On Wed, 11 Apr 2007 12:39:05 +0200
Andi Kleen <ak@...e.de> wrote:

> > The next kernel patch for Perfmon will not make use of the idle notification
> > anymore on any platform.
> 
> What do you use instead? 
> 
> I've been actually thinking to add idle notifier support to oprofile to correct
> for the "perfctr doesn't tick in idle" issue which makes numbers not add up to 100%. 
> A lot of people are currently running idle=poll to work around this and that is very
> wasteful.

There was some plan to be able to switch idle handlers at runtime, so one can select
idle=poll just during oprofile operation.  I'm not sure what happened to that idea.
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