From nobody Tue Jun 23 17:17:41 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C34BC433F5 for ; Tue, 1 Mar 2022 13:34:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235059AbiCANfG (ORCPT ); Tue, 1 Mar 2022 08:35:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233631AbiCANfE (ORCPT ); Tue, 1 Mar 2022 08:35:04 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 876353A198; Tue, 1 Mar 2022 05:34:23 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 27B571042; Tue, 1 Mar 2022 05:34:23 -0800 (PST) Received: from ip-10-252-15-108.eu-west-1.compute.internal (unknown [10.252.15.108]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 94B393F70D; Tue, 1 Mar 2022 05:34:21 -0800 (PST) From: German Gomez To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, acme@kernel.org Cc: German Gomez , Jiri Olsa , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: [PATCH] perf test arm64: Test unwinding using fame-pointer (fp) mode Date: Tue, 1 Mar 2022 13:34:13 +0000 Message-Id: <20220301133414.11766-1-german.gomez@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add a shell script to check that the call-graphs generated using frame pointers (--call-graph fp) are complete and not missing leaf functions: | $ perf test 88 -v | 88: Check Arm64 callgraphs are complete in fp mode : | --- start --- | test child forked, pid 8734 | + Compiling test program (/tmp/test_program.Cz3yL)... | + Recording (PID=3D8749)... | + Stopping perf-record... | test_program.Cz | 728 leaf | 753 parent | 76c main | test child finished with 0 | ---- end ---- | Check Arm SPE callgraphs are complete in fp mode: Ok Fixes: b9f6fbb3b2c2 ("perf arm64: Inject missing frames when using 'perf re= cord --call-graph=3Dfp'") Suggested-by: Jiri Olsa Signed-off-by: German Gomez --- .../perf/tests/shell/test_arm_callgraph_fp.sh | 65 +++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100755 tools/perf/tests/shell/test_arm_callgraph_fp.sh diff --git a/tools/perf/tests/shell/test_arm_callgraph_fp.sh b/tools/perf/t= ests/shell/test_arm_callgraph_fp.sh new file mode 100755 index 000000000..c4fa9255b --- /dev/null +++ b/tools/perf/tests/shell/test_arm_callgraph_fp.sh @@ -0,0 +1,65 @@ +#!/bin/sh +# Check Arm64 callgraphs are complete in fp mode +# SPDX-License-Identifier: GPL-2.0 + +lscpu | grep -q "aarch64" || exit 2 + +if ! [ -x "$(command -v cc)" ]; then + echo "failed: no compiler, install gcc" + exit 2 +fi + +PERF_DATA=3D$(mktemp /tmp/__perf_test.perf.data.XXXXX) +TEST_PROGRAM_SOURCE=3D$(mktemp /tmp/test_program.XXXXX.c) +TEST_PROGRAM=3D$(mktemp /tmp/test_program.XXXXX) + +cleanup_files() +{ + rm -f $PERF_DATA + rm -f $TEST_PROGRAM_SOURCE + rm -f $TEST_PROGRAM +} + +trap cleanup_files exit term int + +cat << EOF > $TEST_PROGRAM_SOURCE +int a =3D 0; +void leaf(void) { + for (;;) + a +=3D a; +} +void parent(void) { + leaf(); +} +int main(void) { + parent(); + return 0; +} +EOF + +echo " + Compiling test program ($TEST_PROGRAM)..." +CFLAGS=3D"-O0 -fno-inline -fno-omit-frame-pointer" +cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1 + +# Add a 1 second delay to skip samples that are not in the leaf() function +perf record -o $PERF_DATA --call-graph fp -e cycles//u -D 1000 -- $TEST_PR= OGRAM 2> /dev/null & +PID=3D$! +echo " + Recording (PID=3D$PID)..." +sleep 2 +echo " + Stopping perf-record..." +kill $PID +wait $PID + +# example perf-script output: +# +# program=20 +# 728 leaf +# 753 parent +# 76c main +# ... + +perf script -i $PERF_DATA -F comm,ip,sym | head -n4 +perf script -i $PERF_DATA -F comm,ip,sym | head -n4 | + awk '{ if ($2 !=3D "") sym[i++] =3D $2 } END { if (sym[0] !=3D "leaf" || + sym[1] !=3D "parent" || + sym[2] !=3D "main") exit 1 }' --=20 2.25.1