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perf arm-spe: Snapshot mode test

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Shell script test_arm_spe.sh has been added to test the recording of SPE
tracing events in snapshot mode.

Reviewed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: German Gomez <german.gomez@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20211109163009.92072-4-german.gomez@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
German Gomez 2021-11-09 16:30:09 +00:00 committed by Arnaldo Carvalho de Melo
parent 56c31cdff7
commit 6b1b208bef
1 changed files with 89 additions and 0 deletions
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89
tools/perf/tests/shell/test_arm_spe.sh Executable file
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#!/bin/sh
# Check Arm SPE trace data recording and synthesized samples
# Uses the 'perf record' to record trace data of Arm SPE events;
# then verify if any SPE event samples are generated by SPE with
# 'perf script' and 'perf report' commands.
# SPDX-License-Identifier: GPL-2.0
# German Gomez <german.gomez@arm.com>, 2021
skip_if_no_arm_spe_event() {
perf list | egrep -q 'arm_spe_[0-9]+//' && return 0
# arm_spe event doesn't exist
return 2
}
skip_if_no_arm_spe_event || exit 2
perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)
glb_err=0
cleanup_files()
{
rm -f ${perfdata}
exit $glb_err
}
trap cleanup_files exit term int
arm_spe_report() {
if [ $2 != 0 ]; then
echo "$1: FAIL"
glb_err=$2
else
echo "$1: PASS"
fi
}
perf_script_samples() {
echo "Looking at perf.data file for dumping samples:"
# from arm-spe.c/arm_spe_synth_events()
events="(ld1-miss|ld1-access|llc-miss|lld-access|tlb-miss|tlb-access|branch-miss|remote-access|memory)"
# Below is an example of the samples dumping:
# dd 3048 [002] 1 l1d-access: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
# dd 3048 [002] 1 tlb-access: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
# dd 3048 [002] 1 memory: ffffaa64999c __GI___libc_write+0x3c (/lib/aarch64-linux-gnu/libc-2.27.so)
perf script -F,-time -i ${perfdata} 2>&1 | \
egrep " +$1 +[0-9]+ .* +${events}:(.*:)? +" > /dev/null 2>&1
}
perf_report_samples() {
echo "Looking at perf.data file for reporting samples:"
# Below is an example of the samples reporting:
# 73.04% 73.04% dd libc-2.27.so [.] _dl_addr
# 7.71% 7.71% dd libc-2.27.so [.] getenv
# 2.59% 2.59% dd ld-2.27.so [.] strcmp
perf report --stdio -i ${perfdata} 2>&1 | \
egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
}
arm_spe_snapshot_test() {
echo "Recording trace with snapshot mode $perfdata"
perf record -o ${perfdata} -e arm_spe// -S \
-- dd if=/dev/zero of=/dev/null > /dev/null 2>&1 &
PERFPID=$!
# Wait for perf program
sleep 1
# Send signal to snapshot trace data
kill -USR2 $PERFPID
# Stop perf program
kill $PERFPID
wait $PERFPID
perf_script_samples dd &&
perf_report_samples dd
err=$?
arm_spe_report "SPE snapshot testing" $err
}
arm_spe_snapshot_test
exit $glb_err