linux-next.git/tools/perf/tests/shell/lib, branch master

perf tests: Fix flakiness in trace record and replay test

2026-07-01T00:09:13+00:00

The `perf trace record and replay` test fails intermittently on slow or virtualized hosts because the default recording workload (`sleep 1`) occasionally completes without scheduling the target `nanosleep` or `clock_nanosleep` system calls inside the recorded sample window, resulting in the error: `Failed: cannot find *nanosleep syscall`. Generalize the `perf_record_with_retry` helper in `tests/shell/lib/perf_record.sh` to support a custom record command prefix via the `PERF_RECORD_CMD` environment variable (defaulting to "perf record"). Update `trace_record_replay.sh` to use this robust retry loop running with `PERF_RECORD_CMD="perf trace record"` and a base workload of `sleep`. The test will automatically retry with scaled sleep durations (from 0.01s up to 2.0s) until the required `nanosleep` event is successfully captured. Fixes: 15bcfb96d0dd ("perf test: Add trace record and replay test") Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf tests: Skip metrics validation if system-wide recording lacks permission

2026-07-01T00:09:13+00:00

The metrics value validation test requires system-wide recording (`-a`), which can fail on systems without root permissions or where paranoid levels restrict tracing. Add a check to skip the test if `-a` is not supported. Also fix false negatives during validation by updating parse error string patterns and resolving issues in metric list generation. Fixes: 3ad7092f5145 ("perf test: Add metric value validation test") Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf tests: Add robust record retry helper and use subsecond workloads

2026-07-01T00:09:13+00:00

Introduce `perf_record_with_retry` and `perf_record_cleanup` in a shared library `tests/shell/lib/perf_record.sh` to prevent record test failures caused by transient recording or workload delays. Update `record.sh`, `record_lbr.sh`, `pipe_test.sh`, `kvm.sh`, and `stat_all_pfm.sh` to use this robust record retry logic. These tests now start with very short durations (e.g. 0.01 seconds) and scale up if the initial recording failed to capture samples, significantly improving test execution speed on success while remaining resilient to slow systems. Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf python: Add LiveSession helper

2026-06-30T17:17:19+00:00

Add LiveSession class in tools/perf/python/perf_live.py to support live event collection using perf.evlist and perf.parse_events, avoiding the need to fork a separate perf record process. Signed-off-by: Ian Rogers Assisted-by: Gemini:gemini-3.1-pro-preview Cc: Adrian Hunter Cc: Alice Rogers Cc: Dapeng Mi Cc: Ingo Molnar Cc: James Clark Cc: Leo Yan Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Thomas Richter Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

perf test cs-etm: Remove unused Coresight workloads

2026-06-10T21:55:49+00:00

These are now unused and had various issues like not working with out of source builds and being slow to compile. Delete them. Signed-off-by: James Clark Tested-by: Leo Yan Cc: Amir Ayupov Cc: Ian Rogers Cc: Jiri Olsa Cc: Jonathan Corbet Cc: Mike Leach Cc: Namhyung Kim Cc: Paschalis Mpeis Cc: Shuah Khan Cc: Suzuki Poulouse Signed-off-by: Arnaldo Carvalho de Melo

perf test: Be tolerant of missing json metric none value

2025-11-17T07:24:00+00:00

print_metric_only_json and print_metric_end in stat-display.c may create a metric value of "none" which fails validation as isfloat. Add a helper to properly validate metric numeric values. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf test stat csv: Update test expectations and events

2025-11-12T00:48:36+00:00

Explicitly use a metric rather than implicitly expecting '-e instructions,cycles' to produce a metric. Use a metric with software events to make it more compatible. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf test stat+json: Improve metric-only testing

2025-11-12T00:48:35+00:00

When testing metric-only, pass a metric to perf rather than expecting a hard coded metric value to be generated. Remove keys that were really metric-only units and instead don't expect metric only to have a matching json key as it encodes metrics as {"metric_name", "metric_value"}. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf stat: Fix uncore aggregation number

2025-06-27T23:14:10+00:00

Follow up: lore.kernel.org/CAP-5=fVDF4-qYL1Lm7efgiHk7X=_nw_nEFMBZFMcsnOOJgX4Kg@mail.gmail.com/ The patch adds unit aggregation during evsel merge the aggregated uncore counters. Change the name of the column to `ctrs` and `counters` for json mode. Tested on a 2-socket machine with SNC3, uncore_imc_[0-11] and cpumask="0,120" Before: perf stat -e clockticks -I 1000 --per-socket # time socket cpus counts unit events 1.001085024 S0 1 9615386315 clockticks 1.001085024 S1 1 9614287448 clockticks perf stat -e clockticks -I 1000 --per-node # time node cpus counts unit events 1.001029867 N0 1 3205726984 clockticks 1.001029867 N1 1 3205444421 clockticks 1.001029867 N2 1 3205234018 clockticks 1.001029867 N3 1 3205224660 clockticks 1.001029867 N4 1 3205207213 clockticks 1.001029867 N5 1 3205528246 clockticks After: perf stat -e clockticks -I 1000 --per-socket # time socket ctrs counts unit events 1.001026071 S0 12 9619677996 clockticks 1.001026071 S1 12 9618612614 clockticks perf stat -e clockticks -I 1000 --per-node # time node ctrs counts unit events 1.001027449 N0 4 3207251859 clockticks 1.001027449 N1 4 3207315930 clockticks 1.001027449 N2 4 3206981828 clockticks 1.001027449 N3 4 3206566126 clockticks 1.001027449 N4 4 3206032609 clockticks 1.001027449 N5 4 3205651355 clockticks Tested with JSON output linter: perf test "perf stat JSON output linter" 94: perf stat JSON output linter : Ok Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Signed-off-by: Chun-Tse Shao Link: https://lore.kernel.org/r/20250627201818.479421-1-ctshao@google.com Signed-off-by: Namhyung Kim

perf test: Change all remaining #!/bin/sh to #!/bin/bash

2025-06-26T17:31:05+00:00

There are 43 instances of posix shell tests and 35 instances of bash. To give us a single consistent language for testing in, replace all #!/bin/sh to #!/bin/bash. Common sources that are included in both different shells will now work as expected. And we no longer have to fix up bashisms that appear to work when someone's system has sh symlinked to bash, but don't work on other systems that have both shells installed. Although we could have chosen sh, it's not backwards compatible so it wouldn't be possible to bulk convert without re-writing the existing bash tests. Choosing bash also gives us some nicer features including 'local' variable definitions and regexes in if statements that are already widely used in the tests. It's not expected that there are any users with only sh available due to the large number of bash tests that exist. Discussed in relation to running shellcheck here: https://lore.kernel.org/linux-perf-users/e3751a74be34bbf3781c4644f518702a7270220b.1749785642.git.collin.funk1@gmail.com/ Signed-off-by: James Clark Reviewed-by: Collin Funk Acked-by: Arnaldo Carvalho de Melo Link: https://lore.kernel.org/r/20250623-james-perf-bash-tests-v1-1-f572f54d4559@linaro.org Signed-off-by: Namhyung Kim