From mboxrd@z Thu Jan 1 00:00:00 1970 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 38CBAC433FE for ; Tue, 25 Jan 2022 16:32:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238965AbiAYQcP (ORCPT ); Tue, 25 Jan 2022 11:32:15 -0500 Received: from foss.arm.com ([217.140.110.172]:54038 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351666AbiAYQZv (ORCPT ); Tue, 25 Jan 2022 11:25:51 -0500 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 CA3E4D6E; Tue, 25 Jan 2022 08:25:48 -0800 (PST) Received: from e127744.arm.com (unknown [10.57.88.59]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 885263F766; Tue, 25 Jan 2022 08:25:46 -0800 (PST) From: German Gomez To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, acme@kernel.org Cc: German Gomez , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: [PATCH 1/1] perf test: Add branch stack sampling tests for ARM64 Date: Tue, 25 Jan 2022 16:25:09 +0000 Message-Id: <20220125162510.2860932-2-german.gomez@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220125162510.2860932-1-german.gomez@arm.com> References: <1642998653-21377-1-git-send-email-anshuman.khandual@arm.com> <20220125162510.2860932-1-german.gomez@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adds two shell script tests in order to test branch stack sampling on ARM64 plarforms. This functionality is enabled by the Branch Record Buffer Extension (BRBE) on Arm. Information about BRBE can be found in [1] chapter F1. [1]: https://developer.arm.com/documentation/ddi0608/latest Signed-off-by: German Gomez --- .../perf/tests/shell/test_arm_brbe_kernel.sh | 42 ++++++++++ .../tests/shell/test_arm_brbe_userspace.sh | 80 +++++++++++++++++++ 2 files changed, 122 insertions(+) create mode 100755 tools/perf/tests/shell/test_arm_brbe_kernel.sh create mode 100755 tools/perf/tests/shell/test_arm_brbe_userspace.sh diff --git a/tools/perf/tests/shell/test_arm_brbe_kernel.sh b/tools/perf/tests/shell/test_arm_brbe_kernel.sh new file mode 100755 index 000000000..dc5a2238f --- /dev/null +++ b/tools/perf/tests/shell/test_arm_brbe_kernel.sh @@ -0,0 +1,42 @@ +#!/bin/bash +# Arm64 BRBE kernel branches + +# SPDX-License-Identifier: GPL-2.0 +# German Gomez , 2022 + +PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX) + +cleanup_files() { + rm -f $PERF_DATA* +} + +trap cleanup_files exit term int + +test_brbe_kernel() { + lscpu | grep -q "aarch64" || return $? + perf record -o $PERF_DATA --branch-filter any,k -- true > /dev/null 2>&1 +} + +test_brbe_kernel || exit 2 + +# example perf-script output: +# 0xffffffff9a80dd5e/0xffffffff9a87c5c0/P/-/-/1 +# 0xffff8000080ac20c/0xffff800008e99720/P/-/-/2 +# 0xffff8000080ac20c/0xffff800008e99720/P/-/-/3 + +# kernel addresses always have the upper 16 bits set (https://lwn.net/Articles/718895/) +KERNEL_ADDRESS_REGEX="0xffff[0-9a-f]{12}" + +perf record -o $PERF_DATA --branch-filter any,k -a -- sleep 1 +perf script -i $PERF_DATA --fields brstack | egrep "(0x0|$KERNEL_ADDRESS_REGEX)\/(0x0|$KERNEL_ADDRESS_REGEX)\/" > /dev/null +err=$? + +echo -n "BRB kernel branches: " +if [ $err != 0 ]; then + echo "FAIL" + exit 1 +else + echo "PASS" +fi + +exit 0 diff --git a/tools/perf/tests/shell/test_arm_brbe_userspace.sh b/tools/perf/tests/shell/test_arm_brbe_userspace.sh new file mode 100755 index 000000000..4f0bdc03a --- /dev/null +++ b/tools/perf/tests/shell/test_arm_brbe_userspace.sh @@ -0,0 +1,80 @@ +#!/bin/bash +# Arm64 BRBE userspace branches + +# SPDX-License-Identifier: GPL-2.0 +# German Gomez , 2022 + +PERF_DATA=$(mktemp /tmp/__perf_test.perf.data.XXXXX) +TEST_PROGRAM_SOURCE=$(mktemp /tmp/brbe_test_program.XXXXX.c) +TEST_PROGRAM=$(mktemp /tmp/brbe_test_program.XXXXX) + +cleanup_files() { + rm -f $PERF_DATA* + rm -f $TEST_PROGRAM_SOURCE + rm -f $TEST_PROGRAM +} + +trap cleanup_files exit term int + +test_brbe_user() { + lscpu | grep -q "aarch64" || return $? + perf record -o $PERF_DATA --branch-filter any,u -- true > /dev/null 2>&1 +} + +test_brbe_user || exit 2 + +# Skip if there's no compiler +# We need it to compile the test program +if ! [ -x "$(command -v cc)" ]; then + echo "failed: no compiler, install gcc" + exit 2 +fi + +script_has_branch() { + local from="$1\+0x[0-9a-f]+" + local to="$2\+0x[0-9a-f]+" + perf script -i $PERF_DATA --fields brstacksym | egrep -qm 1 " +$from\/$to\/" +} + +# compile test program +cat << EOF > $TEST_PROGRAM_SOURCE +void f2() { +} +void f1() { + f2(); +} +void f0() { + f1(); + f2(); +} +int main() { + while(1) { + f0(); + f1(); + } + return 0; +} +EOF + +CFLAGS="-O0 -fno-inline -static" +cc $CFLAGS $TEST_PROGRAM_SOURCE -o $TEST_PROGRAM || exit 1 + +perf record -o $PERF_DATA --branch-filter any,u -- timeout 1 $TEST_PROGRAM + +script_has_branch "main" "f0" && + script_has_branch "main" "f1" && + script_has_branch "f0" "f1" && + script_has_branch "f0" "f2" && + script_has_branch "f1" "f2" && + script_has_branch "main" "main" +err=$? + +echo -n "BRB user branches: " +if [ $err != 0 ]; then + echo "FAIL" + exit 1 +else + echo "PASS" +fi + +exit 0 -- 2.25.1