linux-kernel - RE: [PATCH 1/1] perf, x86: bug fix for cycles:p and cycles:pp on SLM

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Date:	Mon, 22 Dec 2014 13:34:33 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: RE: [PATCH 1/1] perf, x86: bug fix for cycles:p and cycles:pp on SLM


> 
> On Mon, Dec 08, 2014 at 06:27:43AM -0800, kan.liang@...el.com wrote:
> > +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
> > @@ -568,8 +568,8 @@ struct event_constraint
> > intel_atom_pebs_event_constraints[] = {  };
> >
> >  struct event_constraint intel_slm_pebs_event_constraints[] = {
> > -	/* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */
> > -	INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf),
> > +	/* INST_RETIRED.ANY_P */
> > +	INTEL_UEVENT_CONSTRAINT(0x00c0, 0x1),
> 
> Should that not be:
> 	INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x1),
> 
> instead?

No, please refer to Table 19-20 in 19.10 Vol. 3 of SDM.
PEBS is only supported with PMC0.
There is no requirement to set inv and cmask.

Thanks,
Kan

> 
> >  	/* Allow all events as PEBS with no flags */
> >  	INTEL_ALL_EVENT_CONSTRAINT(0, 0x1),
> >  	EVENT_CONSTRAINT_END
> > --
> > 1.8.3.1
> >
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