linux-kernel - Re: [PATCH v6 4/4] perf vendor events arm64: Add ThunderX2 implementation defined pmu core events

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Message-ID: <20171011135517.GF11106@arm.com>
Date:   Wed, 11 Oct 2017 14:55:17 +0100
From:   Will Deacon <will.deacon@....com>
To:     Robert Richter <robert.richter@...ium.com>
Cc:     Zhangshaokun <zhangshaokun@...ilicon.com>,
        Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        catalin.marinas@....com, mark.rutland@....com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        mingo@...hat.com, jnair@...iumnetworks.com,
        Jonathan.Cameron@...wei.com, gklkml16@...il.com
Subject: Re: [PATCH v6 4/4] perf vendor events arm64: Add ThunderX2
 implementation defined pmu core events

On Wed, Oct 11, 2017 at 03:24:31PM +0200, Robert Richter wrote:
> On 11.10.17 13:19:27, Will Deacon wrote:
> > On Tue, Aug 29, 2017 at 02:47:30PM +0200, Robert Richter wrote:
> > > Shaokun,
> > > 
> > > On 29.08.17 17:26:00, Zhangshaokun wrote:
> > > > On 2017/8/24 20:03, Ganapatrao Kulkarni wrote:
> > > > > This is not a full event list, but a short list of useful events.
> > > > > 
> > > > > Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
> > > > > ---
> > > > >  tools/perf/pmu-events/arch/arm64/mapfile.csv       | 15 ++++++
> > > > >  .../arm64/thunderx2/implementation-defined.json    | 62 ++++++++++++++++++++++
> > > > >  2 files changed, 77 insertions(+)
> > > > >  create mode 100644 tools/perf/pmu-events/arch/arm64/mapfile.csv
> > > > >  create mode 100644 tools/perf/pmu-events/arch/arm64/thunderx2/implementation-defined.json
> > > > > 
> > > > 
> > > > I saw you also used thunderx2 in tools/perf/pmu-events/arch/arm64/, how about John's suggestion
> > > > that would use vendor sub-folder?
> > > > Of course, appreciate maintainer's comments.
> > > 
> > > this would just add another level of subdirectories. I rather would
> > > prefer to have a per platform dir comparable to what is listed in
> > > 
> > >  arch/arm64/Kconfig.platforms
> > > 
> > > This is the same as Ganapat has implemented it.
> > 
> > FWIW, I agree with Zhangshaokun here that a silicon vendor subdirectory
> > would organise things better. It also matches what we do for
> > arch/arm64/boot/dts/
> 
> A file structure like:
> 
>  tools/perf/pmu-events/arch/arm64/cavium/thunderx2/implementation-defined.json
> 
> looks quite horible. In contrast to dts dir we will need another
> subdir for each platform and will then have two levels of subdirs.

In which case, call the file thunderx2-imp-def.json or something. The
advantage then is that the SoC names are namespaced by vendor, which is
the best way to avoid confusion imo.

Will