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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 tracepoint | grep -q lock:contention_begin; then
echo "[Skip] No lock contention tracepoints"
err=2
exit
fi
# shellcheck disable=SC2046
if [ `nproc` -lt 4 ]; then
echo "[Skip] Low number of CPUs (`nproc`), lock event cannot be triggered certainly"
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_aggr_cgroup()
{
echo "Testing perf lock contention --lock-cgroup"
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 -g -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 "${result}")" != "0" ]; then
echo "[Fail] Recorded result should not have non-spinlocks:" "$(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 "${result}")" != "0" ]; then
echo "[Fail] BPF result should not have non-spinlocks:" "$(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> ${result}
# find out the type of tasklist_lock
test_lock_filter_type=$(head -1 "${result}" | awk '{ print $8 }' | sed -e 's/:.*//')
if [ "$(grep -c -v "${test_lock_filter_type}" "${result}")" != "0" ]; then
echo "[Fail] Recorded result should not have non-${test_lock_filter_type} locks:" "$(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 "${test_lock_filter_type}" "${result}")" != "0" ]; then
echo "[Fail] BPF result should not have non-${test_lock_filter_type} locks:" "$(cat "${result}")"
err=1
exit
fi
}
test_stack_filter()
{
echo "Testing perf lock contention --callstack-filter (w/ unix_stream)"
perf lock contention -i ${perfdata} -v -q 2> ${result}
if [ "$(grep -c unix_stream "${result}")" = "0" ]; then
echo "[Skip] Could not find 'unix_stream'"
return
fi
perf lock contention -i ${perfdata} -E 1 -S unix_stream -q 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] Recorded result should have a lock from unix_stream:" "$(cat "${result}")"
err=1
exit
fi
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
perf lock con -a -b -S unix_stream -E 1 -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] BPF result should have a lock from unix_stream:" "$(cat "${result}")"
err=1
exit
fi
}
test_aggr_task_stack_filter()
{
echo "Testing perf lock contention --callstack-filter with task aggregation"
perf lock contention -i ${perfdata} -v -q 2> ${result}
if [ "$(grep -c unix_stream "${result}")" = "0" ]; then
echo "[Skip] Could not find 'unix_stream'"
return
fi
perf lock contention -i ${perfdata} -t -E 1 -S unix_stream -q 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] Recorded result should have a task from unix_stream:" "$(cat "${result}")"
err=1
exit
fi
if ! perf lock con -b true > /dev/null 2>&1 ; then
return
fi
perf lock con -a -b -t -S unix_stream -E 1 -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] BPF result should have a task from unix_stream:" "$(cat "${result}")"
err=1
exit
fi
}
test_cgroup_filter()
{
echo "Testing perf lock contention --cgroup-filter"
if ! perf lock con -b true > /dev/null 2>&1 ; then
echo "[Skip] No BPF support"
return
fi
perf lock con -a -b -g -E 1 -F wait_total -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] BPF result should have a cgroup result:" "$(cat "${result}")"
err=1
exit
fi
cgroup=$(cat "${result}" | awk '{ print $3 }')
perf lock con -a -b -g -E 1 -G "${cgroup}" -q -- perf bench sched messaging > /dev/null 2> ${result}
if [ "$(cat "${result}" | wc -l)" != "1" ]; then
echo "[Fail] BPF result should have a result with cgroup filter:" "$(cat "${cgroup}")"
err=1
exit
fi
}
test_csv_output()
{
echo "Testing perf lock contention CSV output"
perf lock contention -i ${perfdata} -E 1 -x , --output ${result}
# count the number of commas in the header
# it should have 5: contended, total-wait, max-wait, avg-wait, type, caller
header=$(grep "# output:" ${result} | tr -d -c , | wc -c)
if [ "${header}" != "5" ]; then
echo "[Fail] Recorded result does not have enough output columns: ${header} != 5"
err=1
exit
fi
# count the number of commas in the output
output=$(grep -v "^#" ${result} | tr -d -c , | wc -c)
if [ "${header}" != "${output}" ]; then
echo "[Fail] Recorded result does not match the number of commas: ${header} != ${output}"
err=1
exit
fi
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 -x , --output ${result} -- perf bench sched messaging > /dev/null 2>&1
output=$(grep -v "^#" ${result} | tr -d -c , | wc -c)
if [ "${header}" != "${output}" ]; then
echo "[Fail] BPF result does not match the number of commas: ${header} != ${output}"
err=1
exit
fi
}
check
test_record
test_bpf
test_record_concurrent
test_aggr_task
test_aggr_addr
test_aggr_cgroup
test_type_filter
test_lock_filter
test_stack_filter
test_aggr_task_stack_filter
test_cgroup_filter
test_csv_output
exit ${err}
|
