From patchwork Wed May 30 00:05:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 10437407 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 8F057601E9 for ; Wed, 30 May 2018 00:05:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7E5152875F for ; Wed, 30 May 2018 00:05:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 73039287C8; Wed, 30 May 2018 00:05:38 +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_ADSP_CUSTOM_MED, DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham 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 0D2B32875F for ; Wed, 30 May 2018 00:05:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968041AbeE3AFh (ORCPT ); Tue, 29 May 2018 20:05:37 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:40161 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967993AbeE3AFW (ORCPT ); Tue, 29 May 2018 20:05:22 -0400 Received: by mail-pf0-f195.google.com with SMTP id f189-v6so8061135pfa.7 for ; Tue, 29 May 2018 17:05:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=3fB+9g8i+C0uNdYINys2klIpvlV1LvvHc4WnQXL+MS0=; b=bsnCtOtFjSLWJT+rFTcJbFop89OXblpPEI+KpZN/nJpdDipzY5AR4Bac/e1Oycccty wvC9sdDFwWrJFv3MRt7C9Lvmh8hsRS2DxxxeH9u15CQbq6VEZ/GFaV2MSltSxjReJ7WM 5pe0q04iUb/eXztpiHTNWRiBFhM9FtHso8fS8JQh56H4KVtBXqGvKqhyGnleGA54Tucn Ly3rZBlGziisJXGaZYDaSFekZkEPxnMXnwPhNygx0ICZLuEGeECqmp1NaWpmTkMt837G Wwhas8vrZlQWuBe5jovnnN/iospjppaJjXDP1KjFvRI27uNqMfdhH7YqG7VUJVvXv23t putQ== 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=3fB+9g8i+C0uNdYINys2klIpvlV1LvvHc4WnQXL+MS0=; b=rA496VrKSBbIoP6xp4bf8paGJiHss/pZZbkAZBsj8RAECUHWIhkUVWI0Kih0bxXJIe QLGiPfsew+XE2FpnnxRoAytiCK6r4ePw6qFCo7IxIRBE5x71VDdqmDB0pwaqDzde9Hkh SSV9XEoPIlTIstpwZZAyj4y/QgMneb4oHzaQTWXXMGtqt8q27SxlnclEnfY0bnZ6JcoU MmXQnQffaGNxAyv8mNSUeBA4fa5PsDfOm9ymPOAaHxu3ai49aN3OIDap2kBFqiZjThvi jb/3BGtf+W5JxBQIzV1ZyTofxB8UtQxreSxjvQzUUzr2XEYm81ETk9x0ZocbNwh7xmzu 8pgw== X-Gm-Message-State: ALKqPwfPLZzqv1uQPY7KZz+F/cz5MNlY/mqew+ja1XuTSHfoAlxgOCYB jSxHrFwqmD7nHcF4PS4ESAhGcw== X-Google-Smtp-Source: ADUXVKKM6LYJ1SRwt9wT3lmUIqi/3Yzztz2N7aloWv3U9hwgGgllrN8iP68KbyEJSpar7KkTl0CSTw== X-Received: by 2002:a63:9541:: with SMTP id t1-v6mr381833pgn.77.1527638721388; Tue, 29 May 2018 17:05:21 -0700 (PDT) Received: from joelaf.mtv.corp.google.com ([2620:0:1000:1600:3122:ea9c:d178:eb]) by smtp.gmail.com with ESMTPSA id w12-v6sm86979211pfi.158.2018.05.29.17.05.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 29 May 2018 17:05:20 -0700 (PDT) From: Joel Fernandes X-Google-Original-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 v8 8/8] kselftests: Add tests for the preemptoff and irqsoff tracers Date: Tue, 29 May 2018 17:05:00 -0700 Message-Id: <20180530000500.257225-9-joel@joelfernandes.org> X-Mailer: git-send-email 2.17.0.921.gf22659ad46-goog In-Reply-To: <20180530000500.257225-1-joel@joelfernandes.org> References: <20180530000500.257225-1-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 atomic sections in the kernel. Signed-off-by: Joel Fernandes (Google) --- tools/testing/selftests/ftrace/config | 3 + .../test.d/preemptirq/irqsoff_tracer.tc | 74 +++++++++++++++++++ 2 files changed, 77 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..29588b328345 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_TEST_ATOMIC_SECTIONS=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..1764ff22c02b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc @@ -0,0 +1,74 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: test for the preemptirqsoff tracer + +MOD=test_atomic_sections + +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 test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail +rmmod test_atomic_sections || fail +modprobe test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail +rmmod test_atomic_sections || fail +modprobe test_atomic_sections atomic_mode=preempt atomic_time=500000 || fail +rmmod test_atomic_sections || 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 test_atomic_sections atomic_mode=irq atomic_time=500000 || fail +rmmod test_atomic_sections || fail +modprobe test_atomic_sections atomic_mode=irq atomic_time=500000 || fail +rmmod test_atomic_sections || fail +modprobe test_atomic_sections atomic_mode=irq atomic_time=500000 || fail +rmmod test_atomic_sections || 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 +