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|
#!/bin/sh
# perf record offcpu profiling tests
# SPDX-License-Identifier: GPL-2.0
set -e
err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
cleanup() {
rm -f ${perfdata}
rm -f ${perfdata}.old
trap - EXIT TERM INT
}
trap_cleanup() {
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
test_offcpu_priv() {
echo "Checking off-cpu privilege"
if [ "$(id -u)" != 0 ]
then
echo "off-cpu test [Skipped permission]"
err=2
return
fi
if perf version --build-options 2>&1 | grep HAVE_BPF_SKEL | grep -q OFF
then
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]"
err=1
return
fi
if ! perf evlist -i ${perfdata} | grep -q "offcpu-time"
then
echo "Basic off-cpu test [Failed no event]"
err=1
return
fi
if ! perf report -i ${perfdata} -q --percent-limit=90 | grep -E -q sleep
then
echo "Basic off-cpu test [Failed missing output]"
err=1
return
fi
echo "Basic off-cpu test [Success]"
}
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 at least for poll, so it should be more than 400 events
if ! perf report -i ${perfdata} -s comm -q -n -t ';' --percent-limit=90 | \
awk -F ";" '{ if (NF > 3 && int($3) < 400) 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
|
