From: Andrew Kilroy <andrew.kilroy@arm.com>
To: John Garry <john.garry@huawei.com>, Ian Rogers <irogers@google.com>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
acme@kernel.org, Will Deacon <will@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Leo Yan <leo.yan@linaro.org>, Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 1/1] perf arm64: Implement --topdown with metrics
Date: Wed, 15 Dec 2021 12:38:47 +0000 [thread overview]
Message-ID: <d91a1b98-2c2b-a961-543f-d540b3c7a146@arm.com> (raw)
In-Reply-To: <b1640897-10d7-c11e-4a7a-d17633916c8e@huawei.com>
Ian, John, thanks for the feedback.
On 15/12/2021 10:52, John Garry wrote:
> Hi Andrew,
>
>>> const struct pmu_event *metricgroup__find_metric(const char *metric,
>>> const struct
>>> pmu_events_map *map);
>>> int metricgroup__parse_groups_test(struct evlist *evlist,
>>> diff --git a/tools/perf/util/topdown.c b/tools/perf/util/topdown.c
>>> index 1081b20f9891..57c0c5f2c6bd 100644
>>> --- a/tools/perf/util/topdown.c
>>> +++ b/tools/perf/util/topdown.c
>>> @@ -56,3 +56,9 @@ __weak bool arch_topdown_sample_read(struct evsel
>>> *leader __maybe_unused)
>>> {
>>> return false;
>>> }
>>> +
>>> +__weak bool arch_topdown_use_json_metrics(void)
>>> +{
>
> AFAICS, only x86 supports topdown today and that is because they have
> special kernel topdown events exposed for the kernel CPU PMU driver. So
> other architectures - not only arm - would need rely on metricgroups for
> topdown support. So let's make this generic for all archs.
>
>> I like this extension! I've ranted in the past about weak symbols
>> breaking with archives due to lazy loading [1]. In this case
>> tools/perf/arch/arm64/util/topdown.c has no other symbols within it
>> and so the weak symbol has an extra chance of being linked
>> incorrectly. We could add a new command line of --topdown-json to
>> avoid this, but there seems little difference in doing this over just
>> doing '-M TopDownL1'.
>
>
>> Is it possible to use the json metric approach
>> for when the CPU version fails?
>
> I think that's a good idea.
>
Taking a look.
> In addition we could also add a --topdown arg to force using JSON
> metricgroups.
>
What arg do think would be supplied?
> Did you actually test this patch? I have something experimental working
> from some time ago, and it was more complicated than this. I need to
> check the code again...
>
I got stats back from this implementation, yes. Let me know if there's
things my patch isn't catering for.
> Thanks,
> John
next prev parent reply other threads:[~2021-12-15 12:39 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-10 12:37 [PATCH v2 0/2] perf vendor events: Arm Neoverse N2 Andrew Kilroy
2021-12-10 12:37 ` [PATCH v2 1/2] perf vendor events: For the " Andrew Kilroy
2021-12-10 13:21 ` John Garry
2021-12-14 18:42 ` [RFC PATCH 0/1] topdown with metrics Andrew Kilroy
2021-12-14 18:42 ` [RFC PATCH 1/1] perf arm64: Implement --topdown " Andrew Kilroy
2021-12-14 20:32 ` Ian Rogers
2021-12-15 10:38 ` James Clark
2021-12-15 10:52 ` John Garry
2021-12-15 12:38 ` Andrew Kilroy [this message]
2021-12-15 12:53 ` John Garry
2022-01-06 16:33 ` Andrew Kilroy
2022-01-06 18:24 ` John Garry
2022-01-11 15:07 ` [RFC PATCH v2 0/5] topdown " Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 1/5] perf stat: Implement --topdown " Andrew Kilroy
2022-01-28 13:44 ` John Garry
2022-01-11 15:07 ` [RFC PATCH v2 2/5] perf stat: Topdown kernel events setup function Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 3/5] perf stat: Topdown json metrics " Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 4/5] perf stat: Detect if topdown kernel events supported Andrew Kilroy
2022-01-11 15:07 ` [RFC PATCH v2 5/5] perf stat: Ensure only topdown kernel events used on x86 Andrew Kilroy
2022-01-20 9:26 ` [RFC PATCH v2 0/5] topdown with metrics John Garry
2022-01-20 16:22 ` Al Grant
2022-01-27 11:42 ` Andrew Kilroy
2022-02-08 15:58 ` Andrew Kilroy
2021-12-20 17:21 ` [RFC PATCH 1/1] perf arm64: Implement --topdown " Andrew Kilroy
2021-12-21 14:03 ` Andi Kleen
2022-01-27 11:11 ` Andrew Kilroy
2021-12-17 10:19 ` John Garry
2021-12-21 14:31 ` Andrew Kilroy
2022-01-05 16:58 ` Andrew Kilroy
2022-01-28 18:00 ` John Garry
2021-12-10 12:37 ` [PATCH v2 2/2] perf vendor events: Rename arm64 arch std event files Andrew Kilroy
2021-12-10 13:46 ` John Garry
2021-12-10 19:01 ` Arnaldo Carvalho de Melo
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