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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# perf record LBR tests
set -e
shelldir=$(dirname "$0")
. "${shelldir}"/lib/perf_record.sh
ParanoidAndNotRoot() {
[ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
}
if [ ! -f /sys/bus/event_source/devices/cpu/caps/branches ] &&
[ ! -f /sys/bus/event_source/devices/cpu_core/caps/branches ]
then
echo "Skip: only x86 CPUs support LBR"
exit 2
fi
err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
cleanup() {
rm -rf "${perfdata}"
rm -rf "${perfdata}".old
rm -rf "${perfdata}".txt
perf_record_cleanup
trap - EXIT TERM INT
}
trap_cleanup() {
echo "Unexpected signal in ${FUNCNAME[1]}"
cleanup
exit 1
}
trap trap_cleanup EXIT TERM INT
check_lbr_callgraph() {
perf report --stitch-lbr -i "${perfdata}" > "${perfdata}".txt 2>&1
}
lbr_callgraph_test() {
test="LBR callgraph"
echo "$test"
set +e
perf_record_with_retry "${perfdata}" "check_lbr_callgraph" "perf test -w thloop" \
-e cycles --call-graph lbr
local ret=$?
set -e
if [ $ret -eq 2 ]; then
echo "$test [Failed support missing]"
if [ $err -eq 0 ]
then
err=2
fi
return
elif [ $ret -eq 1 ]; then
cat "${perfdata}".txt
echo "$test [Failed in perf report]"
err=1
return
fi
echo "$test [Success]"
}
check_lbr_samples() {
local out
out=$(perf report -D -i "${perfdata}" 2> /dev/null | grep -A1 'PERF_RECORD_SAMPLE')
[ "$(echo "$out" | grep -c 'PERF_RECORD_SAMPLE' || true)" -gt 0 ]
}
lbr_test() {
local branch_flags=$1
local test="LBR $2 test"
local threshold=$3
local out
local sam_nr
local bs_nr
local zero_nr
local r
echo "$test"
set +e
perf_record_with_retry "${perfdata}" "check_lbr_samples" "perf test -w thloop" \
-e cycles $branch_flags
local ret=$?
set -e
if [ $ret -eq 2 ]; then
echo "$test [Failed support missing]"
if [ $err -eq 0 ]
then
err=2
fi
return
elif [ $ret -eq 1 ]; then
echo "$test [Failed no samples captured]"
err=1
return
fi
out=$(perf report -D -i "${perfdata}" 2> /dev/null | grep -A1 'PERF_RECORD_SAMPLE')
sam_nr=$(echo "$out" | grep -c 'PERF_RECORD_SAMPLE' || true)
echo "$test: $sam_nr samples"
bs_nr=$(echo "$out" | grep -c 'branch stack: nr:' || true)
if [ $sam_nr -ne $bs_nr ]
then
echo "$test [Failed samples missing branch stacks]"
err=1
return
fi
zero_nr=$(echo "$out" | grep -A3 'branch stack: nr:0' | grep thread | grep -cv swapper || true)
r=$(($zero_nr * 100 / $bs_nr))
if [ $r -gt $threshold ]; then
echo "$test [Failed empty br stack ratio exceed $threshold%: $r%]"
err=1
return
fi
echo "$test [Success]"
}
parallel_lbr_test() {
err=0
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
lbr_test "$1" "$2" "$3"
cleanup
exit $err
}
lbr_callgraph_test
# Sequential
lbr_test "-b" "any branch" 2
lbr_test "-j any_call" "any call" 2
lbr_test "-j any_ret" "any ret" 2
lbr_test "-j ind_call" "any indirect call" 2
lbr_test "-j ind_jmp" "any indirect jump" 100
lbr_test "-j call" "direct calls" 2
lbr_test "-j ind_call,u" "any indirect user call" 100
if ! ParanoidAndNotRoot 1
then
lbr_test "-a -b" "system wide any branch" 2
lbr_test "-a -j any_call" "system wide any call" 2
fi
# Parallel
parallel_lbr_test "-b" "parallel any branch" 100 &
pid1=$!
parallel_lbr_test "-j any_call" "parallel any call" 100 &
pid2=$!
parallel_lbr_test "-j any_ret" "parallel any ret" 100 &
pid3=$!
parallel_lbr_test "-j ind_call" "parallel any indirect call" 100 &
pid4=$!
parallel_lbr_test "-j ind_jmp" "parallel any indirect jump" 100 &
pid5=$!
parallel_lbr_test "-j call" "parallel direct calls" 100 &
pid6=$!
parallel_lbr_test "-j ind_call,u" "parallel any indirect user call" 100 &
pid7=$!
if ParanoidAndNotRoot 1
then
pid8=
pid9=
else
parallel_lbr_test "-a -b" "parallel system wide any branch" 100 &
pid8=$!
parallel_lbr_test "-a -j any_call" "parallel system wide any call" 100 &
pid9=$!
fi
for pid in $pid1 $pid2 $pid3 $pid4 $pid5 $pid6 $pid7 $pid8 $pid9
do
set +e
wait $pid
child_err=$?
set -e
if ([ $err -eq 2 ] && [ $child_err -eq 1 ]) || [ $err -eq 0 ]
then
err=$child_err
fi
done
cleanup
exit $err
|
