[PATCH 4/4] perf tests: Add leader sampling test in record tests

Dapeng Mi
2024-07-02T06:39:53Z

Add leader sampling test to validate event counts are captured into
record and the count value is consistent.

Suggested-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
tools/perf/tests/shell/record.sh | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/tools/perf/tests/shell/record.sh b/tools/perf/tests/shell/record.sh
index 3d1a7759a7b2..8e3e66780fed 100755
--- a/tools/perf/tests/shell/record.sh
+++ b/tools/perf/tests/shell/record.sh
@@ -17,6 +17,7 @@ skip_test_missing_symbol ${testsym}

err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
+script_output=$(mktemp /tmp/__perf_test.perf.data.XXXXX.script)
testprog="perf test -w thloop"
cpu_pmu_dir="/sys/bus/event_source/devices/cpu*"
br_cntr_file="/caps/branch_counter_nr"
@@ -190,11 +191,38 @@ test_branch_counter() {
echo "Basic branch counter test [Success]"
}

+test_leader_sampling() {
+ echo "Basic leader sampling test"
+ if ! perf record -o "${perfdata}" -e "{branches,branches}:Su" perf test -w brstack 2> /dev/null
+ then
+ echo "Leader sampling [Failed record]"
+ err=1
+ return
+ fi
+ index=0
+ perf script -i "${perfdata}" > $script_output
+ while IFS= read -r line
+ do
+ # Check if the two branches counts are equal in each record
+ branches=$(echo $line | awk '{for(i=1;i<=NF;i++) if($i=="branches:") print $(i-1)}')
+ if [ $(($index%2)) -ne 0 ] && [ ${branches}x != ${prev_branches}x ]
+ then
+ echo "Leader sampling [Failed inconsistent branches count]"
+ err=1
+ return
+ fi
+ index=$(($index+1))
+ prev_branches=$branches
+ done < $script_output
+ echo "Basic leader sampling test [Success]"
+}
+
test_per_thread
test_register_capture
test_system_wide
test_workload
test_branch_counter
+test_leader_sampling

cleanup
exit $err
--
2.40.1