Received: by 2002:a6b:fb09:0:0:0:0:0 with SMTP id h9csp505467iog; Wed, 15 Jun 2022 06:47:24 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzAPRIbp/EnRRz1OnK6hWxT2Xhe2qWiCgoP1QjhbsE3+8GHGmZpPhr72bXj83hpe4Sw4MGS X-Received: by 2002:a05:6a00:164c:b0:50a:472a:6b0a with SMTP id m12-20020a056a00164c00b0050a472a6b0amr10142612pfc.77.1655300844427; Wed, 15 Jun 2022 06:47:24 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1655300844; cv=none; d=google.com; s=arc-20160816; b=cu+pkeYS2n8/75H5xih1BAI2tgNdExaDq5bEyJmAjYy9YwH68XXGxZNO/Rqa3ChWZ+ fOAtA1AhpqIV0AQ7UhaNZycgDEB7o5ND/Q9WFzyHpgYC6MCvzGeH6W7j/HIhEyxFTEI4 JkOrf5FI5ExOjI50mK7CasVNZXtOV6KxEc5T3tdJKY7suEsbfHQtoWy8b1+m2yetPy3W 5qbg77rHauGLvAAqoCRMbchx4JYYZLPaedKkrTBc2lIpK0KTwKFrtzAKkdOgSOZLDM4X VUt61OJCEuUqPlCy1k6rHbMGw0M7cxIxRJgWQS3otcO34f/ue+p4T2SXyNBYaIVlt4rA 8Rjg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from; bh=0peP6wXoOcQCz6oojM+xCSdlHi87iXYsjuKEU88Z/BA=; b=M570kS6hIX3EMVJ2kXjzCFdTDlCBrCw1TKQvUGQWcLwQuzJ9Wj6a3EmQHBztjKH3cT EN+ANUhnSLgQZAdOYeaZt860K2Yb8YM6C7OQYtdxMp+aEahQPkBld9MtQqGNbeIWcKes Zu4nqHJPu2dRATJlCC9ai9RrbxcFs4b7eoO8LijJ/bYTp7qfrFJqEhqzWdaaOkuC/LZg twP+PNwWjJvNE+6SDZs06okJREvBy97z17uNkBLJvAvl2wDZZWcN8m+Z18g9uKZkHZtE OcEcaeommC6mHm9Tx8qR9+Q/e6PpaNVJxky4qffuLW2GSnyuJ6lzSdTK0eLHzMgVMPRc 8a9w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id jh1-20020a170903328100b00161872d6f01si15741060plb.98.2022.06.15.06.47.06; Wed, 15 Jun 2022 06:47:24 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348591AbiFONJQ (ORCPT + 99 others); Wed, 15 Jun 2022 09:09:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47106 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234938AbiFONJP (ORCPT ); Wed, 15 Jun 2022 09:09:15 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F312122297; Wed, 15 Jun 2022 06:09:13 -0700 (PDT) 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 DA4071570; Wed, 15 Jun 2022 06:09:13 -0700 (PDT) Received: from e127744.arm.com (unknown [10.57.84.186]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id ABE563F66F; Wed, 15 Jun 2022 06:09:11 -0700 (PDT) From: German Gomez To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, acme@kernel.org Cc: German Gomez , Anshuman Khandual , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: [PATCH] perf test: Add test for branch stack sampling Date: Wed, 15 Jun 2022 14:09:01 +0100 Message-Id: <20220615130901.1151397-2-german.gomez@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220615130901.1151397-1-german.gomez@arm.com> References: <20220615130901.1151397-1-german.gomez@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a self test for branch stack sampling, to check that we get the expected branch types, and filters behave as expected. Suggested-by: Anshuman Khandual Signed-off-by: German Gomez --- tools/perf/tests/shell/lib/brstack/main.h | 16 +++++ tools/perf/tests/shell/lib/brstack/test.c | 24 +++++++ tools/perf/tests/shell/test_brstack.sh | 86 +++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 tools/perf/tests/shell/lib/brstack/main.h create mode 100644 tools/perf/tests/shell/lib/brstack/test.c create mode 100755 tools/perf/tests/shell/test_brstack.sh diff --git a/tools/perf/tests/shell/lib/brstack/main.h b/tools/perf/tests/shell/lib/brstack/main.h new file mode 100644 index 000000000..94d2665ec --- /dev/null +++ b/tools/perf/tests/shell/lib/brstack/main.h @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0 +#define BENCH_RUNS 99999 + +void bench(void); + +int main(void) +{ + int cnt = 0; + + while (1) { + if ((cnt++) > BENCH_RUNS) + break; + bench(); /* call */ + } /* branch (uncond) */ + return 0; +} diff --git a/tools/perf/tests/shell/lib/brstack/test.c b/tools/perf/tests/shell/lib/brstack/test.c new file mode 100644 index 000000000..8a2308901 --- /dev/null +++ b/tools/perf/tests/shell/lib/brstack/test.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "main.h" + +int cnt; + +void bar(void) +{ +} /* return */ + +void foo(void) +{ + bar(); /* call */ +} /* return */ + +void bench(void) +{ + void (*foo_ind)(void) = foo; + + if ((cnt++) % 3) /* branch (cond) */ + foo(); /* call */ + + bar(); /* call */ + foo_ind(); /* call (ind) */ +} diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh new file mode 100755 index 000000000..2b1a1b20a --- /dev/null +++ b/tools/perf/tests/shell/test_brstack.sh @@ -0,0 +1,86 @@ +#!/bin/sh +# Check branch stack sampling + +# SPDX-License-Identifier: GPL-2.0 +# German Gomez , 2022 + +set -e + +# we need a C compiler to build the test programs +# so bail if none is found +if ! [ -x "$(command -v cc)" ]; then + echo "failed: no compiler, install gcc" + exit 2 +fi + +# skip the test if the hardware doesn't support branch stack sampling +perf record -b -o- -- true > /dev/null || exit 2 + +TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX) + +cleanup() { + rm -rf $TMPDIR +} + +trap cleanup exit term int + +test_user_branches() { + echo + echo "Testing user branch stack sampling" + echo + + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out + + perf record -o $TMPDIR/perf.data -q --branch-filter any,save_type,u -- $TMPDIR/a.out + perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script + + # example of branch entries: + # foo+0x14/bar+0x40/P/-/-/0/CALL + + set -x + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/IND_CALL$" $TMPDIR/perf.script + egrep -m1 "^foo\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bar\+[^ ]*/foo\+[^ ]*/RET$" $TMPDIR/perf.script + egrep -m1 "^foo\+[^ ]*/bench\+[^ ]*/RET$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/bench\+[^ ]*/COND$" $TMPDIR/perf.script + egrep -m1 "^main\+[^ ]*/main\+[^ ]*/UNCOND$" $TMPDIR/perf.script + set +x + + # some branch types are still not being tested: + # IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX +} + +test_filter() { + local filter=$1 + local expect=$2 + + echo + echo "Testing branch stack filtering permutation ($filter,$expect)" + echo + + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out + + perf record -o $TMPDIR/perf.data -q --branch-filter $filter,save_type,u -- $TMPDIR/a.out + perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script + + # fail if we find any branch type that doesn't match any of the expected ones + # also consider UNKNOWN branch types (-) + if egrep -vm1 "^[^ ]*/($expect|-|( *))$" $TMPDIR/perf.script; then + return 1 + fi +} + +test_user_branches + +# first argument is the argument passed to "--branch-stack ,save_type,u" +# second argument are the expected branch types for the given filter +test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST" +test_filter "call" "CALL|SYSCALL" +test_filter "cond" "COND" +test_filter "any_ret" "RET|COND_RET|SYSRET|ERET" + +test_filter "call,cond" "CALL|SYSCALL|COND" +test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|FAULT_DATA|FAULT_INST|SYSCALL|COND" +test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST|RET|COND_RET|SYSRET|ERET" -- 2.25.1