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perf tests: Add test for stat delay option with duration_time

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Add a new test case `test_stat_delay` to `stat.sh` to verify that
`duration_time` correctly excludes the delay period when using the
delay option (-D).

The test runs `perf stat -D 1000 -e duration_time sleep 2` and
verifies that `duration_time` is ~1s (excluding the 1s delay), not
~2s.

Assisted-by: Antigravity:gemini-3-flash
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Francesco Nigro <nigro.fra@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-05-18 18:41:06 -07:00 committed by Arnaldo Carvalho de Melo
parent 0b18bced54
commit f83deb0580
1 changed files with 53 additions and 0 deletions
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53
tools/perf/tests/shell/stat.sh
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@ -483,6 +483,58 @@ test_stat_pid() {
wait $pid 2>/dev/null || true
}
test_stat_delay() {
echo "stat -D test"
if ! env LC_ALL=C perf stat -D 1000 -e duration_time sleep 2 > "${stat_output}" 2>&1
then
echo "stat -D test [Failed - command failed]"
cat "${stat_output}"
err=1
return
fi
duration=$(grep "duration_time" "${stat_output}" | awk '{print $1}' | tr -d ',')
elapsed=$(grep "seconds time elapsed" "${stat_output}" | awk '{print $1}')
if [ -z "$duration" ] || [ -z "$elapsed" ]
then
echo "stat -D test [Failed - failed to find duration_time or time elapsed in output]"
cat "${stat_output}"
err=1
return
fi
# Compare duration (ns) and elapsed (s) using awk to handle float and allow tolerance.
if ! awk -v d="$duration" -v e="$elapsed" '
BEGIN {
diff = d - (e * 1e9);
if (diff < 0) diff = -diff;
# Allow 200ms tolerance (200,000,000 ns) for loaded CI machines.
if (diff > 200000000) {
printf "Fail: duration (%d ns) and elapsed (%f s) mismatch (diff %d ns)\n", d, e, diff;
exit 1;
}
# Lower bound check: must be at least 0.5s.
if (d < 500000000) {
printf "Fail: duration (%d ns) is abnormally small\n", d;
exit 1;
}
# Upper bound check: must be strictly less than 1.7s (proving delay was excluded).
if (d > 1700000000) {
printf "Fail: duration (%d ns) is too large (delay might not be excluded)\n", d;
exit 1;
}
exit 0;
}'
then
echo "stat -D test [Failed - validation failed]"
cat "${stat_output}"
err=1
return
fi
echo "stat -D test [Success]"
}
test_default_stat
test_null_stat
test_offline_cpu_stat
@ -498,6 +550,7 @@ test_stat_no_aggr
test_stat_detailed
test_stat_repeat
test_stat_pid
test_stat_delay
cleanup
exit $err