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#!/bin/sh
# kernel lock contention analysis test
# SPDX-License-Identifier: GPL-2.0
set -e
err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
result=$(mktemp /tmp/__perf_test.result.XXXXX)
cleanup() {
rm -f ${perfdata}
rm -f ${result}
trap - exit term int
}
trap_cleanup() {
cleanup
exit ${err}
}
trap trap_cleanup exit term int
check() {
if [ `id -u` != 0 ]; then
echo "[Skip] No root permission"
err=2
exit
fi
if ! perf list | grep -q lock:contention_begin; then
echo "[Skip] No lock contention tracepoints"
err=2
exit
fi
}
test_record()
{
echo "Testing perf lock record and perf lock contention"
perf lock record -o ${perfdata} -- perf bench sched messaging > /dev/null 2>&1
# the output goes to the stderr and we expect only 1 output (-E 1)
perf lock contention -i ${perfdata} -E 1 -q 2> ${result}
if [ $(cat "${result}" | wc -l) != "1" ]; then
echo "[Fail] Recorded result count is not 1:" $(cat "${result}" | wc -l)
err=1
exit
fi
}
test_bpf()
{
echo "Testing perf lock contention --use-bpf"
if ! perf lock con -b true > /dev/null 2>&1 ; then
echo "[Skip] No BPF support"
exit
fi
# the perf lock contention output goes to the stderr
perf lock con -a -b -E 1 -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ $(cat "${result}" | wc -l) != "1" ]; then
echo "[Fail] BPF result count is not 1:" $(cat "${result}" | wc -l)
err=1
exit
fi
}
check
test_record
test_bpf
exit ${err}
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