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

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Message-ID: <20170831105317.GQ17961@rric.localdomain>
Date:   Thu, 31 Aug 2017 12:53:17 +0200
From:   Robert Richter <robert.richter@...ium.com>
To:     Zhangshaokun <zhangshaokun@...ilicon.com>
Cc:     Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Will.Deacon@....com, 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,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH v6 4/4] perf vendor events arm64: Add ThunderX2
 implementation defined pmu core events

Shaokun,

On 31.08.17 18:29:01, Zhangshaokun wrote:
> On 2017/8/29 20:47, Robert Richter wrote:
> > 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
> > 
> 
> Check it again that not all vendors have specific platform config per SoC family,
> so this would not work for us (HiSilicon) and maybe some other vendors.

Even if there is no specific platform defined in Kconfig, you still
could create a platform dir in tools/perf/. There must not be a 1:1
mapping. DT compatible strings may give a hint for naming then.

-Robert