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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"
return
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
}
test_record_concurrent()
{
echo "Testing perf lock record and perf lock contention at the same time"
perf lock record -o- -- perf bench sched messaging 2> /dev/null | \
perf lock contention -i- -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_aggr_task()
{
echo "Testing perf lock contention --threads"
perf lock contention -i ${perfdata} -t -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
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
# the perf lock contention output goes to the stderr
perf lock con -a -b -t -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
}
test_aggr_addr()
{
echo "Testing perf lock contention --lock-addr"
perf lock contention -i ${perfdata} -l -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
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
# the perf lock contention output goes to the stderr
perf lock con -a -b -l -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
}
test_type_filter()
{
echo "Testing perf lock contention --type-filter (w/ spinlock)"
perf lock contention -i ${perfdata} -Y spinlock -q 2> ${result}
if [ $(grep -c -v spinlock "${result}") != "0" ]; then
echo "[Fail] Recorded should not have non-spinlocks:" $(cat "${result}")
err=1
exit
fi
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
perf lock con -a -b -Y spinlock -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ $(grep -c -v spinlock "${result}") != "0" ]; then
echo "[Fail] Recorded should not have non-spinlocks:" $(cat "${result}")
err=1
exit
fi
}
test_lock_filter()
{
echo "Testing perf lock contention --lock-filter (w/ tasklist_lock)"
perf lock contention -i ${perfdata} -l -q 2> ${result}
if [ $(grep -c tasklist_lock "${result}") != "1" ]; then
echo "[Skip] Could not find 'tasklist_lock'"
return
fi
perf lock contention -i ${perfdata} -L tasklist_lock -q 2> ${result}
# find out the type of tasklist_lock
local type=$(head -1 "${result}" | awk '{ print $8 }' | sed -e 's/:.*//')
if [ $(grep -c -v "${type}" "${result}") != "0" ]; then
echo "[Fail] Recorded should not have non-${type} locks:" $(cat "${result}")
err=1
exit
fi
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
perf lock con -a -b -L tasklist_lock -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ $(grep -c -v "${type}" "${result}") != "0" ]; then
echo "[Fail] Recorded should not have non-${type} locks:" $(cat "${result}")
err=1
exit
fi
}
check
test_record
test_bpf
test_record_concurrent
test_aggr_task
test_aggr_addr
test_type_filter
test_lock_filter
exit ${err}
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