Re: [RFC][PATCH] perf_events, x86: PEBS support

[Peter Zijlstra]

On Tue, 2010-02-02 at 19:26 +0100, Ingo Molnar wrote:
> * Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> > @@ -203,8 +203,9 @@ struct perf_event_attr {
> >  				enable_on_exec :  1, /* next exec enables     */
> >  				task           :  1, /* trace fork/exit       */
> >  				watermark      :  1, /* wakeup_watermark      */
> > +				precise        :  1,
> 
> I think we want to default to precise events even if not specifically 
> requested by user-space, in the cases where that's possible on the CPU 
> without additional limitations.
> 
> That way people will default to better (and possibly cheaper) PEBS profiling 
> on modern Intel CPUs.

Sure, I'll look at that once it starts working :-)

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