linux-kernel - RE: [PATCH V3 1/5] perf/x86/intel/uncore: customized pmu event read for client IMC uncore

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Date:   Thu, 2 Nov 2017 13:51:58 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "acme@...nel.org" <acme@...nel.org>,
        "eranian@...gle.com" <eranian@...gle.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: RE: [PATCH V3 1/5] perf/x86/intel/uncore: customized pmu event read
 for client IMC uncore

> On Tue, 24 Oct 2017, kan.liang@...el.com wrote:
> > -	if (event->hw.idx >= UNCORE_PMC_IDX_FIXED)
> > +	if (event->hw.idx == UNCORE_PMC_IDX_FIXED)
> >  		shift = 64 - uncore_fixed_ctr_bits(box);
> >  	else
> >  		shift = 64 - uncore_perf_ctr_bits(box); diff --git
> > a/arch/x86/events/intel/uncore_snb.c
> > b/arch/x86/events/intel/uncore_snb.c
> > index db1127c..9d5cd3f 100644
> > --- a/arch/x86/events/intel/uncore_snb.c
> > +++ b/arch/x86/events/intel/uncore_snb.c
> > @@ -498,6 +498,30 @@ static void snb_uncore_imc_event_del(struct
> perf_event *event, int flags)
> >  	snb_uncore_imc_event_stop(event, PERF_EF_UPDATE);  }
> >
> > +static void snb_uncore_imc_event_read(struct perf_event *event) {
> > +	struct intel_uncore_box *box = uncore_event_to_box(event);
> > +	u64 prev_count, new_count, delta;
> > +	int shift;
> > +
> > +	if (event->hw.idx >= UNCORE_PMC_IDX_FIXED)
> 
> And this needs to be >= because?

Patch 5/5 will clean up the client IMC uncore.
Before that, we still need it to make client IMC uncore work.

This patch isolates the >= case for client IMC uncore.

Thanks,
Kan