Re: [patch 0/2] NOHZ vs. profile/oprofile v2

[Ingo Molnar]

* Martin Schwidefsky <schwidefsky@xxxxxxxxxx> wrote:

> On Mon, 22 Jun 2009 16:41:10 +0200
> Ingo Molnar <mingo@xxxxxxx> wrote:
> 
> > Hm, this is rather ugly. Why not use hrtimers like 'perf' does when 
> > it fallback-samples based on the timer tick?
> > 
> > That method has three advantages:
> > 
> >  - no weird hookery needed
> >  - resolution can go far beyond HZ
> >  - it is evidently dynticks-safe
> 
> Hmm, if we replace the HZ based oprofile tick with an hrtimer we 
> should add an interface to configure the sample interval as well, 
> no? Otherwise we just replace one timer event (HZ) with another 
> (hrtimer).

Even if the hrtimer is set with a 1/HZ period it's a better 
solution, as it's dynticks safe without invasive changes.

	Ingo
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