linux-kernel - Re: [PATCH] perf/x86/amd: Explicitly define PERF_COUNT_HW_REF_CPU

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Message-ID: <20160427093251.GA13534@angband.pl>
Date:	Wed, 27 Apr 2016 11:32:51 +0200
From:	Adam Borowski <kilobyte@...band.pl>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] perf/x86/amd: Explicitly define
 PERF_COUNT_HW_REF_CPU_CYCLES as undefined.

On Wed, Apr 27, 2016 at 10:03:45AM +0200, Ingo Molnar wrote:
> * Adam Borowski <kilobyte@...band.pl> wrote:
> > diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
> > index 86a9bec..5fa1b8e 100644
> > --- a/arch/x86/events/amd/core.c
> > +++ b/arch/x86/events/amd/core.c
> > @@ -125,6 +125,7 @@ static const u64 amd_perfmon_event_map[] =
> >    [PERF_COUNT_HW_BRANCH_MISSES]			= 0x00c3,
> >    [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND]	= 0x00d0, /* "Decoder empty" event */
> >    [PERF_COUNT_HW_STALLED_CYCLES_BACKEND]	= 0x00d1, /* "Dispatch stalls" event */
> > +  [PERF_COUNT_HW_REF_CPU_CYCLES]		=      0,
> >  };
> 
> Hm, I think it would be cleaner and more robust to change this (and all other 
> similar, if any) arrays to [PERF_COUNT_HW_MAX] instead.

Good idea!  Both of Intel's copies (one for p4, one for core+) already set
the size this way.

-- 
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