Re: [RFC PATCH 2/2] perf stat: Use event group to simulate PMI on PMI-less hardware counter

[Zhang Rui <rui.zhang@intel.com>]

On Thu, 2010-11-11 at 20:46 +0800, Peter Zijlstra wrote:
> On Thu, 2010-11-11 at 10:00 +0800, Zhang Rui wrote:
> > Well, the RAPL package energy perf event may need this piece of code.
> > 
> >  "MSR_PKG_ENERGY_STATUS is a read-only MSR. It reports the actual energy
> > use for the package domain. This MSR is updated every ~1msec. It has a
> > wraparound time of around 60 secs when power consumption is high, and
> > may be longer otherwise."
> > 
> > As it's an energy counter, we should show it in "perf stat", right?
> > As it doesn't have interrupt, I want to schedule a timer interrupt every
> > 30s to update the event counter. 
> 
> So use a timer inside the RAPL pmu driver. No need to change the
> interface or add generic code.

Okay.
I was wondering if this can be done with the current perf framework.
If not, surely I'm okay with using a timer inside RAPL driver. :)

thanks,
rui