Re: perf, x86: Disable PEBS on SandyBridge chips

[H. Peter Anvin]

On 02/17/2012 02:08 PM, David Ahern wrote:
> On 2/17/12 2:40 PM, H. Peter Anvin wrote:
> > On 02/17/2012 07:12 AM, Peter Zijlstra wrote:
> > > On Fri, 2012-02-17 at 13:39 +0100, Maarten Lankhorst wrote:
> > > > Hey Peter,
> > > >
> > > > Why is PEBS disabled? If I look at the intel_clovertown_quirks I can
> > > > see
> > > > why it's disabled for that cpu, but the sandy bridge one lacks any kind
> > > > of clarification or information on why, or how I can learn more.
> > >
> > > hpa, could you get the official Intel answer on this?
> >
> > *Where* is PEBS disabled?
>
> arch/x86/kernel/cpu/perf_event_intel.c,
> intel_sandybridge_quirk()

OK, this is Peter's patch and I don't think I was involved with it... I 
need more of a pointer to be able to track this down.

	-hpa


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