Re: 2.6.21-rc6-mm1

Andrew Morton
2007-04-11T18:15:27Z

On Wed, 11 Apr 2007 12:39:05 +0200
Andi Kleen <ak@suse.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.