From patchwork Wed Sep 15 19:52:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 12497303 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CA55C433F5 for ; Wed, 15 Sep 2021 19:55:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1484261056 for ; Wed, 15 Sep 2021 19:55:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231690AbhIOT4t (ORCPT ); Wed, 15 Sep 2021 15:56:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231583AbhIOT4t (ORCPT ); Wed, 15 Sep 2021 15:56:49 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13F74C061574 for ; Wed, 15 Sep 2021 12:55:30 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id k9-20020a05620a138900b003d59b580010so7125477qki.18 for ; Wed, 15 Sep 2021 12:55:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:cc; bh=PYnDsf6Z8HAFankjEIQtAqVz+3xCBBR84fY+jWAUM7E=; b=BoI+/9QhGavjQDVL7msVbCCq3P+hCXFgyieI73l2GEOM/6dn97yZdEmwDpxb4FxCiz Y4TBchYMeTsl2Y8jJXSqT34mYPaSNvVH80u+xmhofH8yu/fU5/lGrWqHCa9vpWrv2iJO PUgpylEz9G+8OW4kioo6cNhi+P8wMyCjGqvaUeOTAUkgou3nx/2hOu9sHmWp2asBWSG+ lajTgpvxg6C9r12yzmmgnTl8GKjYBryQ4zbs22Bfc8icTypF+mCcRylwY536IB61rVrk VvdZs8MlhJkbaSopHwYYMaafTunLjFVIHgnnH0UBwvZo8crluBYwg+PDxYVhsoOB8O6W Z+7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:cc; bh=PYnDsf6Z8HAFankjEIQtAqVz+3xCBBR84fY+jWAUM7E=; b=c7vLtEW2YAAEH7KaxFBgJYVUambsh/ktO8BGvs7A7g38+Bv0gHHaazh9L4qoRyv3/W +kvKKpPymeAUjijN8+0qhfdRXZ0pBT+BxL6+pjfHzuS7mxj1/EId31NTqPZaUrf0EkhC Z8fp79j2TWevkOMJgPy2qNY/wufx706r8xNThaZ9omK8s+wpg6rcyKdW4MUvKwfDtyxm JoqroW5x7amy6ill32clB3R994JNXAycnMztlD3ihnDC+tYN1VRIBlvKMnCY/Iib6DqH WqSxSu4fLWscA7w9rs8TI7lmZk4NHgptxmG0W49a8GBG1yUBwTOHcfZ2DN/qang5Agb7 bBfA== X-Gm-Message-State: AOAM531ZEpxonCXEn8zcQx3jDoEurJnaNS8c8GG3msGILzsnm4gY+a97 9DvUMil5HOFt9+bZE86kj/oXBo9/eD9GLYh2Ig== X-Google-Smtp-Source: ABdhPJxAykTg7RcIHWD9bU0VJvH1BS0A14YALfmkdBBBpqo/ub0jMF31CR0E4xp6QQbm6e5tx2P1UfmTwPW0QxKNoQ== X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:cc00:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:522c:: with SMTP id r12mr1556950qvq.17.1631735729298; Wed, 15 Sep 2021 12:55:29 -0700 (PDT) Date: Wed, 15 Sep 2021 19:52:48 +0000 In-Reply-To: <20210915195306.612966-1-kaleshsingh@google.com> Message-Id: <20210915195306.612966-5-kaleshsingh@google.com> Mime-Version: 1.0 References: <20210915195306.612966-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH 4/5] tracing/selftests: Add tests for hist trigger expression parsing From: Kalesh Singh Cc: surenb@google.com, hridya@google.com, namhyung@kernel.org, Kalesh Singh , Jonathan Corbet , Steven Rostedt , Ingo Molnar , Shuah Khan , Tom Zanussi , Masami Hiramatsu , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add tests for the parsing of hist trigger expressions; and to validate expression evaluation. Signed-off-by: Kalesh Singh --- .../testing/selftests/ftrace/test.d/functions | 4 +- .../trigger/trigger-hist-expressions.tc | 73 +++++++++++++++++++ 2 files changed, 75 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions index 000fd05e84b1..1855a63559ad 100644 --- a/tools/testing/selftests/ftrace/test.d/functions +++ b/tools/testing/selftests/ftrace/test.d/functions @@ -16,13 +16,13 @@ reset_tracer() { # reset the current tracer reset_trigger_file() { # remove action triggers first - grep -H ':on[^:]*(' $@ | + grep -H ':on[^:]*(' $@ | tac | while read line; do cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["` file=`echo $line | cut -f1 -d:` echo "!$cmd" >> $file done - grep -Hv ^# $@ | + grep -Hv ^# $@ | tac | while read line; do cmd=`echo $line | cut -f2- -d: | cut -f1 -d"["` file=`echo $line | cut -f1 -d:` diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc new file mode 100644 index 000000000000..0e2361cd334f --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-expressions.tc @@ -0,0 +1,73 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test histogram expression parsing +# requires: set_event events/sched/sched_process_fork/trigger events/sched/sched_process_fork/hist error_log + + +fail() { #msg + echo $1 + exit_fail +} + +get_hist_var() { #var_name hist_path + hist_output=`grep -m1 "$1: " $2` + hitcount=`echo $hist_output | awk '{ for (i=1; i<=NF; ++i) { if ($i ~ "hitcount:") print $(i+1)} }'` + var_sum=`echo $hist_output | awk '{ for (i=1; i<=NF; ++i) { if ($i ~ "'$1':") print $(i+1)} }'` + var_val=$(( var_sum / hitcount )) + echo $var_val +} + +test_hist_expr() { # test_name expression expected_val + echo "Test hist trigger expressions - $1" + + echo "hist:keys=common_pid:x=$2" > events/sched/sched_process_fork/trigger + echo 'hist:keys=common_pid:vals=$x' >> events/sched/sched_process_fork/trigger + for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done + + actual=`get_hist_var x events/sched/sched_process_fork/hist` + + if [ $actual != $3 ]; then + fail "Failed hist trigger expression evaluation: Expression: $2 Expected: $3, Actual: $actual" + fi + + reset_trigger +} + +check_error() { # test_name command-with-error-pos-by-^ + echo "Test hist trigger expressions - $1" + ftrace_errlog_check 'hist:sched:sched_process_fork' "$2" 'events/sched/sched_process_fork/trigger' + reset_trigger +} + +test_hist_expr "Variable assignment" "123" "123" + +test_hist_expr "Subtraction not associative" "16-8-4-2" "2" + +test_hist_expr "Division not associative" "64/8/4/2" "1" + +test_hist_expr "Same precedence operators (+,-) evaluated left to right" "16-8+4+2" "14" + +test_hist_expr "Same precedence operators (*,/) evaluated left to right" "4*3/2*2" "12" + +test_hist_expr "Multiplication evaluated before addition/subtraction" "4+3*2-2" "8" + +test_hist_expr "Division evaluated before addition/subtraction" "4+6/2-2" "5" + +# Division by zero returns -1 +test_hist_expr "Handles division by zero" "3/0" "-1" + +# err pos is where the last detected sub-express was detected +# this can vary depending on how the expression tree generated +check_error "Too many subexpressions" 'hist:keys=common_pid:x=32+^10*3/20-4' +check_error "Too many subexpressions" 'hist:keys=common_pid:x=^1+2+3+4+5' + +check_error "Unary minus not supported in subexpression" 'hist:keys=common_pid:x=-(^1)+2' + +check_error "'.sym-offset' modifier not supported in subexpression" \ + 'hist:keys=common_pid:x=1+common_pid^.sym-offset' +check_error "'.sym-offset' modifier not supported in subexpression" \ + 'hist:keys=common_pid:x=common_pid^.sym-offset-2' +check_error "'.sym-offset' modifier not supported in subexpression" \ + 'hist:keys=common_pid:x=4/common_pid^.sym-offset*3' + +exit 0