Messages in this thread | | | Subject | Re: [RFC PATCH 1/1] perf arm64: Implement --topdown with metrics | From | John Garry <> | Date | Fri, 17 Dec 2021 10:19:31 +0000 |
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On 14/12/2021 18:42, Andrew Kilroy wrote: > This patch implements the --topdown option by making use of metrics to > dictate what counters are obtained in order to show the various topdown > columns, e.g. Frontend Bound, Backend Bound, Retiring and Bad > Speculation. > > The MetricGroup name is used to identify which set of metrics are to be > shown. For the moment use TopDownL1 and enable for arm64 > > Signed-off-by: Andrew Kilroy<andrew.kilroy@arm.com>
This works in that it gives results, but does not supply the same output format as for x86 nor has same restrictions in usage (-a commandline required, for example, below).
For my x86 broadwell:
john@localhost:~/linux/tools/perf> sudo ./perf stat --topdown sleep 1 top down event configuration requires system-wide mode (-a)
john@localhost:~/linux/tools/perf> sudo ./perf stat --topdown -a sleep 1 Performance counter stats for 'system wide':
retiring bad speculation frontend bound backend bound S0-D0-C0 2 29.2% 6.3% 37.4% 27.1% S0-D0-C1 2 20.4% 6.2% 42.1% 31.3%
0.998007338 seconds time elapsed
john@localhost:~/linux/tools/perf>
---
Then my arm64 hip08 platform:
john@debian:~/kernel-dev/tools/perf$ sudo ./perf stat --topdown sleep 1
Performance counter stats for 'sleep 1':
retiring bad_speculation backend_bound frontend_bound 0.19 0.17 0.27 0.37
1.000832714 seconds time elapsed
0.000891000 seconds user 0.000000000 seconds sys
And there is no colouring for results which are above/below standard thresholds (see stat-shadow.c:get_radio_color()).
My impression is that we're not plugging the results from metricgroup__parse_groups_to_evlist() into the --topdown print functionality properly.
Thanks, John
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