Commit 199d5e87 authored by Ian Rogers's avatar Ian Rogers Committed by Namhyung Kim
Browse files

perf tests script dlfilter: Add a dlfilter test 



Compile a simple dlfilter and make sure it remove samples from
everything other than a test_loop.

Signed-off-by: default avatarIan Rogers <irogers@google.com>
Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
parent 526ed2f8

tools/perf/tests/shell/script_dlfilter.sh

0 → 100755
+107 −0
Original line number Diff line number Diff line 
#!/bin/bash

# perf script --dlfilter tests

# SPDX-License-Identifier: GPL-2.0



set -e



shelldir=$(dirname "$0")

# shellcheck source=lib/setup_python.sh

. "${shelldir}"/lib/setup_python.sh



# skip if there's no compiler

if ! [ -x "$(command -v cc)" ]; then

	echo "failed: no compiler, install gcc"

	exit 2

fi



err=0

perfdata=$(mktemp /tmp/__perf_test.perf.data.XXXXX)

dlfilter_c=$(mktemp /tmp/__perf_test.dlfilter.test.c.XXXXX)

dlfilter_so=$(mktemp /tmp/__perf_test.dlfilter.so.XXXXX)



cleanup() {

	rm -f "${perfdata}"

	rm -f "${dlfilter_c}"

	rm -f "${dlfilter_so}"

	rm -f "${dlfilter_so}.o"



	trap - EXIT TERM INT

}



trap_cleanup() {

	echo "Unexpected signal in ${FUNCNAME[1]}"

	cleanup

	exit 1

}

trap trap_cleanup EXIT TERM INT



cat <<EOF > "${dlfilter_c}"

#include <perf/perf_dlfilter.h>

#include <string.h>

#include <stdio.h>



struct perf_dlfilter_fns perf_dlfilter_fns;



int filter_event(void *data, const struct perf_dlfilter_sample *sample, void *ctx)

{

	const struct perf_dlfilter_al *al;



	if (!sample->ip)

		return 0;



	al = perf_dlfilter_fns.resolve_ip(ctx);

	if (!al || !al->sym || strcmp(al->sym, "test_loop"))

		return 1;



	return 0;

}

EOF



test_dlfilter() {

	echo "Basic --dlfilter test"

	# Generate perf.data file

	if ! perf record -o "${perfdata}" perf test -w thloop 1 2> /dev/null

	then

		echo "Basic --dlfilter test [Failed record]"

		err=1

		return

	fi



	# Build the dlfilter

	if ! cc -c -I tools/perf/include -fpic -x c "${dlfilter_c}" -o "${dlfilter_so}.o"

	then

		echo "Basic --dlfilter test [Failed to build dlfilter object]"

		err=1

		return

	fi



	if ! cc -shared -o "${dlfilter_so}" "${dlfilter_so}.o"

	then

		echo "Basic --dlfilter test [Failed to link dlfilter shared object]"

		err=1

		return

	fi



	# Check that the output contains "test_loop" and nothing else

	if ! perf script -i "${perfdata}" --dlfilter "${dlfilter_so}" | grep -q "test_loop"

	then

		echo "Basic --dlfilter test [Failed missing output]"

		err=1

		return

	fi



	# The filter should filter out everything except test_loop, so ensure no other symbols are present

	# This is a simple check; we could be more rigorous

	if perf script -i "${perfdata}" --dlfilter "${dlfilter_so}" | grep -v "test_loop" | grep -q "perf"

	then

		echo "Basic --dlfilter test [Failed filtering]"

		err=1

		return

	fi



	echo "Basic --dlfilter test [Success]"

}



test_dlfilter

cleanup

exit $err