[RFC PATCH 0/1] topdown with metrics

[Andrew Kilroy]

Hi John,

> BTW, I was looking at adding perf tool --topdown support for arm64. This will require L1 metricgroup support per core - see what I did here for our hisilicon platform already:
> 
> [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/pmu-events/arch/arm64/hisilicon/hip08/metrics.json
> 
> I would like to add support for more cores. Generally the arm common events match up to the definitions here:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Documentation/perf-stat.txt#n400
> 
> Apart from frontend_bound - would you have an equivalent metric expression for this for these Neoverse cores?
> 
> [0] Note that I think that the divisor in the metric expressions is max uops that the core can deal with. 

Thanks for this, we’ve been working on how to support perf --topdown.
We’re still considering the right events/calculations on our CPUs.

To introduce the calculations in metrics jsons we would like this patch
to alter the --topdown option on arm64.

How does this fit with your solution?

Andrew


Andrew Kilroy (1):
  perf arm64: Implement --topdown with metrics

 tools/perf/arch/arm64/util/Build     |  1 +
 tools/perf/arch/arm64/util/topdown.c |  8 ++++++++
 tools/perf/builtin-stat.c            | 13 +++++++++++++
 tools/perf/util/metricgroup.c        | 12 ++++++++++++
 tools/perf/util/metricgroup.h        |  7 +++++++
 tools/perf/util/topdown.c            |  6 ++++++
 tools/perf/util/topdown.h            |  1 +
 7 files changed, 48 insertions(+)
 create mode 100644 tools/perf/arch/arm64/util/topdown.c

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2.17.1