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Subject[PATCH 6/6] perf offcpu: Update offcpu test for child process
Date
Record off-cpu data with perf bench sched messaging workload and count
the number of offcpu-time events. Also update the test script not to
run next tests if failed already and revise the error messages.

$ sudo ./perf test offcpu -v
88: perf record offcpu profiling tests :
--- start ---
test child forked, pid 344780
Checking off-cpu privilege
Basic off-cpu test
Basic off-cpu test [Success]
Child task off-cpu test
Child task off-cpu test [Success]
test child finished with 0
---- end ----
perf record offcpu profiling tests: Ok

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/tests/shell/record_offcpu.sh | 57 ++++++++++++++++++++++---
1 file changed, 50 insertions(+), 7 deletions(-)

diff --git a/tools/perf/tests/shell/record_offcpu.sh b/tools/perf/tests/shell/record_offcpu.sh
index 96e0739f7478..611b2d7c779b 100755
--- a/tools/perf/tests/shell/record_offcpu.sh
+++ b/tools/perf/tests/shell/record_offcpu.sh
@@ -19,20 +19,26 @@ trap_cleanup() {
}
trap trap_cleanup exit term int

-test_offcpu() {
- echo "Basic off-cpu test"
+test_offcpu_priv() {
+ echo "Checking off-cpu privilege"
+
if [ `id -u` != 0 ]
then
- echo "Basic off-cpu test [Skipped permission]"
+ echo "off-cpu test [Skipped permission]"
err=2
return
fi
- if perf record --off-cpu -o ${perfdata} --quiet true 2>&1 | grep BUILD_BPF_SKEL
+ if perf record --off-cpu -o /dev/null --quiet true 2>&1 | grep BUILD_BPF_SKEL
then
- echo "Basic off-cpu test [Skipped missing BPF support]"
+ echo "off-cpu test [Skipped missing BPF support]"
err=2
return
fi
+}
+
+test_offcpu_basic() {
+ echo "Basic off-cpu test"
+
if ! perf record --off-cpu -e dummy -o ${perfdata} sleep 1 2> /dev/null
then
echo "Basic off-cpu test [Failed record]"
@@ -41,7 +47,7 @@ test_offcpu() {
fi
if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
then
- echo "Basic off-cpu test [Failed record]"
+ echo "Basic off-cpu test [Failed no event]"
err=1
return
fi
@@ -54,7 +60,44 @@ test_offcpu() {
echo "Basic off-cpu test [Success]"
}

-test_offcpu
+test_offcpu_child() {
+ echo "Child task off-cpu test"
+
+ # perf bench sched messaging creates 400 processes
+ if ! perf record --off-cpu -e dummy -o ${perfdata} -- \
+ perf bench sched messaging -g 10 > /dev/null 2&>1
+ then
+ echo "Child task off-cpu test [Failed record]"
+ err=1
+ return
+ fi
+ if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
+ then
+ echo "Child task off-cpu test [Failed no event]"
+ err=1
+ return
+ fi
+ # each process waits for read and write, so it should be more than 800 events
+ if ! perf report -i ${perfdata} -s comm -q -n -t ';' | \
+ awk -F ";" '{ if (NF > 3 && int($3) < 800) exit 1; }'
+ then
+ echo "Child task off-cpu test [Failed invalid output]"
+ err=1
+ return
+ fi
+ echo "Child task off-cpu test [Success]"
+}
+
+
+test_offcpu_priv
+
+if [ $err = 0 ]; then
+ test_offcpu_basic
+fi
+
+if [ $err = 0 ]; then
+ test_offcpu_child
+fi

cleanup
exit $err
--
2.37.0.rc0.161.g10f37bed90-goog
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