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Message-ID: <20251114220547.496562-3-irogers@google.com>
Date: Fri, 14 Nov 2025 14:05:47 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Thomas Falcon <thomas.falcon@...el.com>, Howard Chu <howardchu95@...il.com>,
James Clark <james.clark@...aro.org>, Zhongqiu Han <quic_zhonhan@...cinc.com>,
Anubhav Shelat <ashelat@...hat.com>, Ravi Bangoria <ravi.bangoria@....com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 3/3] perf evsel: Skip store_evsel_ids for non-perf-event PMUs
The IDs are associated with perf events and not applicable to non-perf
event PMUs. The failure to generate the ids was causing perf stat
record to fail.
```
$ perf stat record -a sleep 1
Performance counter stats for 'system wide':
47,941 context-switches # nan cs/sec cs_per_second
0.00 msec cpu-clock # 0.0 CPUs CPUs_utilized
3,261 cpu-migrations # nan migrations/sec migrations_per_second
516 page-faults # nan faults/sec page_faults_per_second
7,525,483 cpu_core/branch-misses/ # 2.3 % branch_miss_rate
322,069,004 cpu_core/branches/ # nan M/sec branch_frequency
1,895,684,291 cpu_core/cpu-cycles/ # nan GHz cycles_frequency
2,789,777,426 cpu_core/instructions/ # 1.5 instructions insn_per_cycle
7,074,765 cpu_atom/branch-misses/ # 3.2 % branch_miss_rate (49.89%)
224,225,412 cpu_atom/branches/ # nan M/sec branch_frequency (50.29%)
2,061,679,981 cpu_atom/cpu-cycles/ # nan GHz cycles_frequency (50.33%)
2,011,242,533 cpu_atom/instructions/ # 1.0 instructions insn_per_cycle (50.33%)
TopdownL1 (cpu_core) # 9.0 % tma_bad_speculation
# 28.3 % tma_frontend_bound
# 35.2 % tma_backend_bound
# 27.5 % tma_retiring
TopdownL1 (cpu_atom) # 36.8 % tma_backend_bound (59.65%)
# 22.8 % tma_frontend_bound (59.60%)
# 11.6 % tma_bad_speculation
# 28.8 % tma_retiring (59.59%)
1.006777519 seconds time elapsed
$ perf stat report
Performance counter stats for 'perf':
1,013,376,154 duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
<not counted> duration_time
47,941 context-switches
0.00 msec cpu-clock
3,261 cpu-migrations
516 page-faults
7,525,483 cpu_core/branch-misses/
322,069,814 cpu_core/branches/
322,069,004 cpu_core/branches/
1,895,684,291 cpu_core/cpu-cycles/
1,895,679,209 cpu_core/cpu-cycles/
2,789,777,426 cpu_core/instructions/
<not counted> cpu_core/cpu-cycles/
<not counted> cpu_core/stalled-cycles-frontend/
<not counted> cpu_core/cpu-cycles/
<not counted> cpu_core/stalled-cycles-backend/
<not counted> cpu_core/stalled-cycles-backend/
<not counted> cpu_core/instructions/
<not counted> cpu_core/stalled-cycles-frontend/
7,074,765 cpu_atom/branch-misses/ (49.89%)
221,679,088 cpu_atom/branches/ (49.89%)
224,225,412 cpu_atom/branches/ (50.29%)
2,061,679,981 cpu_atom/cpu-cycles/ (50.33%)
2,016,259,567 cpu_atom/cpu-cycles/ (50.33%)
2,011,242,533 cpu_atom/instructions/ (50.33%)
<not counted> cpu_atom/cpu-cycles/
<not counted> cpu_atom/stalled-cycles-frontend/
<not counted> cpu_atom/cpu-cycles/
<not counted> cpu_atom/stalled-cycles-backend/
<not counted> cpu_atom/stalled-cycles-backend/
<not counted> cpu_atom/instructions/
<not counted> cpu_atom/stalled-cycles-frontend/
17,145,113 cpu_core/INT_MISC.UOP_DROPPING/
10,594,226,100 cpu_core/TOPDOWN.SLOTS/
2,919,021,401 cpu_core/topdown-retiring/
943,101,838 cpu_core/topdown-bad-spec/
3,031,152,533 cpu_core/topdown-fe-bound/
3,739,756,791 cpu_core/topdown-be-bound/
1,909,501,648 cpu_atom/CPU_CLK_UNHALTED.CORE/ (60.04%)
3,516,608,359 cpu_atom/TOPDOWN_BE_BOUND.ALL/ (59.65%)
2,179,403,876 cpu_atom/TOPDOWN_FE_BOUND.ALL/ (59.60%)
2,745,732,458 cpu_atom/TOPDOWN_RETIRING.ALL/ (59.59%)
1.006777519 seconds time elapsed
Some events weren't counted. Try disabling the NMI watchdog:
echo 0 > /proc/sys/kernel/nmi_watchdog
perf stat ...
echo 1 > /proc/sys/kernel/nmi_watchdog
```
Reported-by: James Clark <james.clark@...aro.org>
Closes: https://lore.kernel.org/lkml/ca0f0cd3-7335-48f9-8737-2f70a75b019a@linaro.org/
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
I looked into adding metrics to perf stat report but there would be a
merge conflict with:
https://lore.kernel.org/lkml/20251113180517.44096-1-irogers@google.com/
so holding off for now.
---
tools/perf/util/evsel.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 989c56d4a23f..aee42666e882 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -3974,6 +3974,9 @@ static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
if (evsel__is_retire_lat(evsel))
return 0;
+ if (perf_pmu__kind(evsel->pmu) != PERF_PMU_KIND_PE)
+ return 0;
+
for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
thread++) {
--
2.52.0.rc1.455.g30608eb744-goog
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