linux-kernel - Re: [PATCH v1 1/2] perf vendor events arm64: Add N3 events/metrics

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Message-ID: <d0ebae42-99b6-42be-beaa-947160da3b88@linaro.org>
Date: Mon, 13 Jan 2025 16:48:06 +0000
From: James Clark <james.clark@...aro.org>
To: Ian Rogers <irogers@...gle.com>
Cc: John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
 Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org,
 Nick Forrington <nick.forrington@....com>
Subject: Re: [PATCH v1 1/2] perf vendor events arm64: Add N3 events/metrics



On 13/01/2025 3:51 pm, Ian Rogers wrote:
> On Mon, Jan 13, 2025 at 4:35 AM James Clark <james.clark@...aro.org> wrote:
>>
>>
>>
>> On 10/01/2025 5:20 pm, Ian Rogers wrote:
>>> Using the scripts at:
>>> https://gitlab.arm.com/telemetry-solution/telemetry-solution/
>>>
>>> Generate perf json for neoverse-n3 using the following command:
>>> ```
>>> $ telemetry-solution/tools/perf_json_generator/generate.py \
>>>     tools/perf/ --telemetry-files \
>>>     telemetry-solution/data/pmu/cpu/neoverse/neoverse-n3.json:neoverse-n3
>>> ```
>>>
>>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>>> ---
>>>    .../arm64/arm/neoverse-n3/core-imp-def.json   | 930 ++++++++++++++++++
>>
>> I assume you got warnings about missing groups, if one is missing that
>> results in everything being dumped in core-imp-def.json. I have an
>> internal ticket open about it which is why I didn't post N3 and V3 jsons
>> yet, I'll check on it again.
> 
> I was testing with JEVENTS_ARCH=all. I'm not sure what the group
> warning is, do you have a link?
> 

 From the perf_json_generator:

  $ telemetry-solution/tools/perf_json_generator/generate.py \
    tools/perf/ --telemetry-files \
    telemetry-solution/data/pmu/cpu/neoverse/neoverse-n3.json:neoverse-n3

  Warning: Not writing events which do not have a group (note that the
  mnemonic printed may differ to the one in the source json if it differs
  in the common Perf files):

  IMP_CT_FLUSH: Counts flushes including architectural,
  microarchitectural, and branch redirects.
  ...

>> Up to you whether you want to continue with it like this and I can send
>> a fix up later but there's also a conflict with the recent Fujitsu
>> Monaka events.
> 
> I'm happy to let you push the updates. An alternative, that may work
> around the group issue, is just to push the event updates. Any chance
> on an ETA?
> 
> Thanks,
> Ian

Can't say on an eta. There was a fix already done but not made live yet, 
but now it turns out maybe we don't want to put these particular events 
into Perf because they're not in the TRM. Could be several weeks before 
anything goes live.

It's a bit of a hack but I can regenerate them without these particular 
events in a V2, and then whatever the outcome is from above will be an 
incremental change later.