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 X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 3801AC5CFEB for ; Wed, 11 Jul 2018 06:35:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DAE6B20C0B for ; Wed, 11 Jul 2018 06:35:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=joelfernandes.org header.i=@joelfernandes.org header.b="A0OO7qu7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DAE6B20C0B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=joelfernandes.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726653AbeGKGif (ORCPT ); Wed, 11 Jul 2018 02:38:35 -0400 Received: from mail-pf0-f196.google.com ([209.85.192.196]:38014 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726496AbeGKGie (ORCPT ); Wed, 11 Jul 2018 02:38:34 -0400 Received: by mail-pf0-f196.google.com with SMTP id x13-v6so7813279pfh.5 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=HaU9Dr4yUecD6/pvK7BcJcs93ZQyqi1L7TobjZ1gyWIvAR5yKyGg+8VoztZdCyjnqM KShoWgpxQYT9+15WXQ2AMgEcZgwVK6Ad43DM9Ps/73hsEdubJ6iYg1VMn866eTCsYrLP wu5i+DuopaNyjndufo68u9XPpr7RZPiE7q40MTudG7Qt8Ftw5z51BtLazjT8y+qJHDUc XbzH271iP67QXuzy/trFvSjyiyhvmL4vgqmjLzVBTwAlJ3WBli79K2dmSVYMK4fb4Mij cAMpWvLgVI+YRaH+cxw7I2xHLXR3sqgTxIfHUKlHEIFlrfcXpz75R9sxpiN2YeFLLbyb KHRw== X-Gm-Message-State: APt69E3lmF3HrQoQWbm6FQyzYdm3gONTK6333lX+BEKzCXb/tC9Mn5y+ rDMKt73D3I2C4eZCsaVnagkZAlHEuX8= 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-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 -- 2.18.0.203.gfac676dfb9-goog