linux-kernel - Re: [PATCH v1] perf test all metrics: Fully ignore Default metric failures

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Message-ID: <aR9nKoW0f-gByJQc@google.com>
Date: Thu, 20 Nov 2025 11:08:26 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Clark <james.clark@...aro.org>,
	Thomas Richter <tmricht@...ux.ibm.com>
Subject: Re: [PATCH v1] perf test all metrics: Fully ignore Default metric
 failures

On Wed, Nov 19, 2025 at 11:30:47AM -0800, Ian Rogers wrote:
> Determine if a metric is default from `perf list --raw-dump $m` eg:
> ```
> $ perf list --raw-dump l1_prefetch_miss_rate
> Default4 l1_prefetch_miss_rate
> ```
> If a metric has "not supported" or "no supported events" then ignore
> these failures for default metrics. Tidy up the skip/fail messages in
> the output to make them easier to spot/read.
> 
> Reported-by: Thomas Richter <tmricht@...ux.ibm.com>
> Closes: https://lore.kernel.org/linux-perf-users/20251119104751.51960-1-tmricht@linux.ibm.com/
> Reported-by: Namhyung Kim <namhyung@...nel.org>
> Reported-by: James Clark <james.clark@...aro.org>
> Closes: https://lore.kernel.org/lkml/aRi9xnwdLh3Dir9f@google.com/
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Thanks for the fix!

  $ sudo ./perf test -vv "all metrics"
  103: perf all metrics test:
  --- start ---
  test child forked, pid 3329979
  Testing CPUs_utilized
  Testing backend_cycles_idle
  [Ignored backend_cycles_idle] failed but as a Default metric this can be expected
  Performance counter stats for 'system wide': <not counted> cpu-cycles <not supported> stalled-cycles-backend 0.013059060 seconds time elapsed
  Testing branch_frequency
  Testing branch_miss_rate
  Testing cs_per_second
  Testing cycles_frequency
  Testing frontend_cycles_idle
  Testing insn_per_cycle
  Testing migrations_per_second
  Testing page_faults_per_second
  Testing stalled_cycles_per_instruction
  [Ignored stalled_cycles_per_instruction] failed but as a Default metric this can be expected
  Error: No supported events found. The stalled-cycles-backend event is not supported.
  Testing l1d_miss_rate
  Testing llc_miss_rate
  [Ignored llc_miss_rate] failed but as a Default metric this can be expected
  Error: No supported events found. The LLC-loads event is not supported.
  Testing dtlb_miss_rate
  Testing itlb_miss_rate
  Testing l1i_miss_rate
  Testing l1_prefetch_miss_rate
  [Ignored l1_prefetch_miss_rate] failed but as a Default metric this can be expected
  Performance counter stats for 'system wide': <not counted> L1-dcache-prefetches <not supported> L1-dcache-prefetch-misses 0.012868128 seconds time elapsed
  Testing branch_misprediction_ratio
  Testing all_remote_links_outbound
  Testing nps1_die_to_dram
  Testing all_l2_cache_accesses
  Testing all_l2_cache_hits
  Testing all_l2_cache_misses
  Testing ic_fetch_miss_ratio
  Testing l2_cache_accesses_from_l2_hwpf
  Testing l2_cache_misses_from_l2_hwpf
  Testing l3_read_miss_latency
  Testing l1_itlb_misses
  ---- end(0) ----
  103: perf all metrics test                                           : Ok