From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752180AbeERBye (ORCPT ); Thu, 17 May 2018 21:54:34 -0400 Received: from mail-pg0-f67.google.com ([74.125.83.67]:37837 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751695AbeERByd (ORCPT ); Thu, 17 May 2018 21:54:33 -0400 X-Google-Smtp-Source: AB8JxZrhX4W8m82eAzJC9leylZ00FdldTBxNVlW145BF+ukXcZhMCs0JY1ydsnjfjYHCDvb0f6UoGQ== From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Steven Rostedt , Peter Zilstra , Ingo Molnar , Mathieu Desnoyers , Tom Zanussi , Namhyung Kim , Thomas Glexiner , Boqun Feng , Paul McKenney , Masami Hiramatsu , Todd Kjos , Erick Reyes , Julia Cartwright , kernel-team@android.com Subject: [PATCH 2/2] kselftests: ftrace: Add tests for the preemptoff and irqsoff tracers Date: Thu, 17 May 2018 18:54:21 -0700 Message-Id: <20180518015421.129868-3-joel@joelfernandes.org> X-Mailer: git-send-email 2.17.0.441.gb46fe60e1d-goog In-Reply-To: <20180518015421.129868-1-joel@joelfernandes.org> References: <20180518015421.129868-1-joel@joelfernandes.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Cc: Steven Rostedt Cc: Peter Zilstra Cc: Ingo Molnar Cc: Mathieu Desnoyers Cc: Tom Zanussi Cc: Namhyung Kim Cc: Thomas Glexiner Cc: Boqun Feng Cc: Paul McKenney Cc: Masami Hiramatsu Cc: Todd Kjos Cc: Erick Reyes Cc: Julia Cartwright Cc: kernel-team@android.com 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..b76d781c5645 --- /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 "preemptoff" available_tracers || unsup "preemptoff tracer not enabled" +grep "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 "tracer: preemptoff" trace || fail + +# Check the end of the section +egrep "5.....us : " trace || fail + +# Check for 500ms of latency +egrep "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 "tracer: irqsoff" trace || fail + +# Check the end of the section +egrep "5.....us : " trace || fail + +# Check for 500ms of latency +egrep "latency: 5..... us" trace || fail + +reset_tracer +exit 0 + -- 2.17.0.441.gb46fe60e1d-goog