linux-kernel - Re: [RFC][PATCH 0/4] perf: Enable symbolic event names

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Message-ID: <C2D7FE5348E1B147BCA15975FBA230756659D931@IN01WEMBXB.internal.synopsys.com>
Date:	Sat, 2 May 2015 07:02:11 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Michael Ellerman" <mpe@...erman.id.au>,
	Jiri Olsa <jolsa@...hat.com>,
	"Arnaldo Carvalho de Melo" <acme@...nel.org>,
	Paul Mackerras <paulus@...ba.org>
CC:	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/4] perf: Enable symbolic event names

On Friday 01 May 2015 12:35 PM, Sukadev Bhattiprolu wrote:
> Implement ability to specify Power PMU events by their symbolic event
> names rather than raw codes. This approach pulls tables of the Power7
> and Power8 PMU events into the perf source tree and uses these tables
> to create aliases for the PMU events. With these aliases users can run:
> 
> 	perf stat -e PM_1PLUS_PPC_CMPL:ku sleep 1
> or
> 	perf stat -e cpu/PM_VSU_SINGLE/ sleep 1
> 
> This is an early POC patchset based on discussions with Jiri Olsa,
> Michael Ellerman and Ingo Molnar. Lightly tested on Power7 and Power8.
> 
> Can other architectures can implement arch_get_events_table() and similarly 
> use symoblic event names?


Yes, ARC can certainly use this infrastructure. Our hardware conditions are
actually 1-8 char strings. So using raw events requires me to first convert the
string to ASCII.

> 
> I am also assuming that if the header files like power8-events.h are
> easily readable, we don't need the JSON files anymore?
> 
> TODO:
> 	- Maybe translate event names to lower-case?
> 	- Allow perf to process event descriptions (need Andi Kleen's patch)
> 
> 
> Sukadev Bhattiprolu (4):
>   perf: Create a table of Power7 PMU events
>   perf: Create a table of Power8 PMU events
>   perf/powerpc: Move mfspr and friends to header file
>   perf: Create aliases for Power PMU events
> 
>  tools/perf/arch/powerpc/util/Build           |    2 +-
>  tools/perf/arch/powerpc/util/header.c        |    9 +-
>  tools/perf/arch/powerpc/util/header.h        |    9 +
>  tools/perf/arch/powerpc/util/pmu-events.c    |   52 +
>  tools/perf/arch/powerpc/util/pmu-events.h    |   17 +
>  tools/perf/arch/powerpc/util/power7-events.h | 3315 +++++++++++++
>  tools/perf/arch/powerpc/util/power8-events.h | 6408 ++++++++++++++++++++++++++
>  tools/perf/util/pmu.c                        |   77 +
>  tools/perf/util/pmu.h                        |   10 +
>  9 files changed, 9890 insertions(+), 9 deletions(-)
>  create mode 100644 tools/perf/arch/powerpc/util/header.h
>  create mode 100644 tools/perf/arch/powerpc/util/pmu-events.c
>  create mode 100644 tools/perf/arch/powerpc/util/pmu-events.h
>  create mode 100644 tools/perf/arch/powerpc/util/power7-events.h
>  create mode 100644 tools/perf/arch/powerpc/util/power8-events.h
> 

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