linux-kernel - Re: [PATCH] perf/x86/intel/rapl: Add support for Knights Landing (KNL)

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Message-ID: <1435006562.15776.3.camel@localhost>
Date:	Mon, 22 Jun 2015 13:56:02 -0700
From:	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Jacob Pan Jun <jacob.jun.pan@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86 <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nikhil Rao <nikhil.rao@...el.com>
Subject: Re: [PATCH] perf/x86/intel/rapl: Add support for Knights Landing
 (KNL)

On Mon, 2015-06-22 at 11:52 -0700, Stephane Eranian wrote:
> On Fri, May 29, 2015 at 4:55 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > On Tue, May 26, 2015 at 11:47:39AM -0700, Dasaratharaman Chandramouli wrote:
> > > Knights Landing DRAM RAPL supports PKG and DRAM RAPL domains.
> > > DRAM RAPL has a different fixed energy unit (2^-16J) similar to
> > > that of HSW.
> > >
> >
> > Please also Cc the author of the code you're patching.
> >
> > Cc: Stephane Eranian <eranian@...gle.com>
> > > Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@...el.com>
> > > ---
> > >  arch/x86/kernel/cpu/perf_event_intel_rapl.c | 20 ++++++++++++++++++++
> > >  1 file changed, 20 insertions(+)
> > >
> > > diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> > > index 999289b9..96633fb 100644
> > > --- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> > > +++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
> > > @@ -86,6 +86,10 @@ static const char *rapl_domain_names[NR_RAPL_DOMAINS] __initconst = {
> > >                        1<<RAPL_IDX_RAM_NRG_STAT|\
> > >                        1<<RAPL_IDX_PP1_NRG_STAT)
> > >
> > > +/* Knights Landing has PKG, RAM */
> > > +#define RAPL_IDX_KNL (1<<RAPL_IDX_PKG_NRG_STAT|\
> > > +                      1<<RAPL_IDX_RAM_NRG_STAT)
> > > +
> > >  /*
> > >   * event code: LSB 8 bits, passed in attr->config
> > >   * any other bit is reserved
> > > @@ -487,6 +491,18 @@ static struct attribute *rapl_events_hsw_attr[] = {
> > >       NULL,
> > >  };
> > >
> > > +static struct attribute *rapl_events_knl_attr[] = {
> > > +     EVENT_PTR(rapl_pkg),
> > > +     EVENT_PTR(rapl_ram),
> > > +
> > > +     EVENT_PTR(rapl_pkg_unit),
> > > +     EVENT_PTR(rapl_ram_unit),
> > > +
> > > +     EVENT_PTR(rapl_pkg_scale),
> > > +     EVENT_PTR(rapl_ram_scale),
> > > +     NULL,
> > > +};
> > > +
> > >  static struct attribute_group rapl_pmu_events_group = {
> > >       .name = "events",
> > >       .attrs = NULL, /* patched at runtime */
> > > @@ -730,6 +746,10 @@ static int __init rapl_pmu_init(void)
> > >               rapl_cntr_mask = RAPL_IDX_SRV;
> > >               rapl_pmu_events_group.attrs = rapl_events_srv_attr;
> > >               break;
> > > +     case 87: /* Knights Landing */
> > > +             rapl_add_quirk(rapl_hsw_server_quirk);
> 
> 
> Does KNL also have different raw units for RAM requiring the use of the quirk?

That is right. KNL's DRAM has a different fixed energy unit (2^-16J)
similar to that of HSW

> 
> >
> > > +             rapl_cntr_mask = RAPL_IDX_KNL;
> > > +             rapl_pmu_events_group.attrs = rapl_events_knl_attr;
> >
> >                 break;
> >
> > ?


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