[PATCH v1 1/2] perf vendor events arm64: Add N3 events/metrics
James Clark
james.clark at linaro.org
Mon Jan 20 02:14:04 PST 2025
On 18/01/2025 6:22 pm, Namhyung Kim wrote:
> Hello,
>
> On Mon, Jan 13, 2025 at 04:48:06PM +0000, James Clark wrote:
>>
>>
>> On 13/01/2025 3:51 pm, Ian Rogers wrote:
>>> On Mon, Jan 13, 2025 at 4:35 AM James Clark <james.clark at linaro.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 at google.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.
>
> So what's the final decision?
>
> James, do you want to publish the metrics later at once or are you ok
> with this patch for now (and do the incremental change later)?
>
> Thanks,
> Namhyung
>
I'm just finishing off some changes to the generator script and the
change will end up a bit different. Turns out it wasn't updating the
common events properly either.
I think it's best to leave this one out and I'll send a v2 this week.
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