From patchwork Wed Jul 11 06:35:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 10518829 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 967746032A for ; Wed, 11 Jul 2018 06:36:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8599E28DA1 for ; Wed, 11 Jul 2018 06:36:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 79B5828E87; Wed, 11 Jul 2018 06:36:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E64328DA1 for ; Wed, 11 Jul 2018 06:36:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726360AbeGKGip (ORCPT ); Wed, 11 Jul 2018 02:38:45 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:46007 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726478AbeGKGie (ORCPT ); Wed, 11 Jul 2018 02:38:34 -0400 Received: by mail-pf0-f193.google.com with SMTP id i26-v6so6319937pfo.12 for ; Tue, 10 Jul 2018 23:35:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=h9BHHLcFiHHK/oG6pCAyoLzJSwyk13Cv3ua8XTMoqTA=; b=A0OO7qu7JAFZI3DWzJrgyX8EfAwiB/pehDifGl8Yx1pVh0whHd80jbn76DmIqNfcwD pYBI9HlunviXHCdAzdS62Oz+WOjUAbeGVqfY9gz/zJsyt1lbkpwunnmts2YtJWV0E8f1 pzGzLLCrgzBwDHXTbmXptzsyNJXtW2rdV2c+Q= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=h9BHHLcFiHHK/oG6pCAyoLzJSwyk13Cv3ua8XTMoqTA=; b=TTFo37higz88/b3IfCRIeK/m5/8ApaTM+2TrnCBepAfde/JKqCR0bqz0CMdb2V6StU 4Dp2wpKzmZbY2uZpBlUBzk8MbaIprTYtRzslz/xr2CWpO9utG00rtj1K7RdGrqzk+iHH wfNPAOs1zsUmCXERZiYDdiF4D4SEoFaLo0+xYp3uVA82FDkhvuXlqtLT5CQfERnXcCGi E6JNfVl6GutqusKkZY9SH7dZ8TdWXCbAusdGlplNyVWBTHkI8DKaCuTMzWt7HQtq7dBb u8AqTGUw1S+RCAqzReRVJx736YIT7rrD16O/ce4Qy+HsxZZi4LLsdymVvkyKG4CPGUbO 8oSQ== X-Gm-Message-State: APt69E0OC8ZE30FvRkAES80TjiGXZj6dGUNoYTL6meExAYT1sRp5MNBs nOjk8zwOm11syS79g5ZbTyx/FQ== X-Google-Smtp-Source: AAOMgpeHmykHZbAqB/BhKbaFpalylu7TX1qErhgDksDQIyBJ0pXVEbr1VGTAqB4qk14IPUqwCD5RmQ== X-Received: by 2002:a62:d39b:: with SMTP id z27-v6mr29119432pfk.182.1531290951782; Tue, 10 Jul 2018 23:35:51 -0700 (PDT) Received: from joelaf.mtv.corp.google.com ([2620:0:1000:1600:3122:ea9c:d178:eb]) by smtp.gmail.com with ESMTPSA id h190-v6sm24731891pge.85.2018.07.10.23.35.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 10 Jul 2018 23:35:50 -0700 (PDT) From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: kernel-team@android.com, "Joel Fernandes (Google)" , Boqun Feng , Byungchul Park , Erick Reyes , Ingo Molnar , Julia Cartwright , linux-kselftest@vger.kernel.org, Masami Hiramatsu , Mathieu Desnoyers , Namhyung Kim , Paul McKenney , Peter Zijlstra , Shuah Khan , Steven Rostedt , Thomas Glexiner , Todd Kjos , Tom Zanussi Subject: [PATCH 2/2] kselftests: Add tests for the preemptoff and irqsoff tracers Date: Tue, 10 Jul 2018 23:35:40 -0700 Message-Id: <20180711063540.91101-3-joel@joelfernandes.org> X-Mailer: git-send-email 2.18.0.203.gfac676dfb9-goog In-Reply-To: <20180711063540.91101-1-joel@joelfernandes.org> References: <20180711063540.91101-1-joel@joelfernandes.org> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Joel Fernandes (Google)" Here we add unit tests for the preemptoff and irqsoff tracer by using a kernel module introduced previously to trigger long preempt or irq disabled sections in the kernel. Reviewed-by: Masami Hiramatsu Acked-by: Masami Hiramatsu Signed-off-by: Joel Fernandes (Google) --- tools/testing/selftests/ftrace/config | 3 + .../test.d/preemptirq/irqsoff_tracer.tc | 73 +++++++++++++++++++ 2 files changed, 76 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config index b01924c71c09..07db5ab09cc7 100644 --- a/tools/testing/selftests/ftrace/config +++ b/tools/testing/selftests/ftrace/config @@ -4,3 +4,6 @@ CONFIG_FUNCTION_PROFILER=y CONFIG_TRACER_SNAPSHOT=y CONFIG_STACK_TRACER=y CONFIG_HIST_TRIGGERS=y +CONFIG_PREEMPT_TRACER=y +CONFIG_IRQSOFF_TRACER=y +CONFIG_PREEMPTIRQ_DELAY_TEST=m diff --git a/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc new file mode 100644 index 000000000000..cbd174334a48 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc @@ -0,0 +1,73 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: test for the preemptirqsoff tracer + +MOD=preemptirq_delay_test + +fail() { + reset_tracer + rmmod $MOD || true + exit_fail +} + +unsup() { #msg + reset_tracer + rmmod $MOD || true + echo $1 + exit_unsupported +} + +modprobe $MOD || unsup "$MOD module not available" +rmmod $MOD + +grep -q "preemptoff" available_tracers || unsup "preemptoff tracer not enabled" +grep -q "irqsoff" available_tracers || unsup "irqsoff tracer not enabled" + +reset_tracer + +# Simulate preemptoff section for half a second couple of times +echo preemptoff > current_tracer +sleep 1 +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=preempt delay=500000 || fail +rmmod $MOD || fail + +cat trace + +# Confirm which tracer +grep -q "tracer: preemptoff" trace || fail + +# Check the end of the section +egrep -q "5.....us : " trace || fail + +# Check for 500ms of latency +egrep -q "latency: 5..... us" trace || fail + +reset_tracer + +# Simulate irqsoff section for half a second couple of times +echo irqsoff > current_tracer +sleep 1 +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail +modprobe $MOD test_mode=irq delay=500000 || fail +rmmod $MOD || fail + +cat trace + +# Confirm which tracer +grep -q "tracer: irqsoff" trace || fail + +# Check the end of the section +egrep -q "5.....us : " trace || fail + +# Check for 500ms of latency +egrep -q "latency: 5..... us" trace || fail + +reset_tracer +exit 0