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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED 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 DADB5C28CF6 for ; Fri, 3 Aug 2018 05:24:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 93DFC216ED for ; Fri, 3 Aug 2018 05:24:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="YZUrG/ET" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 93DFC216ED Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.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 S1727566AbeHCHSv (ORCPT ); Fri, 3 Aug 2018 03:18:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:54092 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726829AbeHCHSv (ORCPT ); Fri, 3 Aug 2018 03:18:51 -0400 Received: from devbox (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 81F73216ED; Fri, 3 Aug 2018 05:24:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1533273858; bh=KOOck6/U51Qc6hAZTVHKyfnewF2G2h7NBOwnxBafQKs=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=YZUrG/ETG1vRCr99XTJX75YrEnEN6axvXaqNIalHeYiqDlIQmiXudH86+cX+tICYl JGvNYaekcKoK5WS+7wtKUJ3VvByt+XMO5xs5RMePtuHu7NgSn4jvqbXUQ76Ih7R9al 8Un5DPO4nJxD5xWzTiuszjId7z7nFMBL3Ro1YkeI= Date: Fri, 3 Aug 2018 14:24:14 +0900 From: Masami Hiramatsu To: Masami Hiramatsu Cc: Shuah Khan , Steven Rostedt , Ingo Molnar , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 23/25] selftests/ftrace: Add max stack tracer testcase Message-Id: <20180803142414.a4130589e225ff8b05eead74@kernel.org> In-Reply-To: <153269404756.3084.16183774834747280299.stgit@devbox> References: <153269339575.3084.16279591141931053689.stgit@devbox> <153269404756.3084.16183774834747280299.stgit@devbox> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 27 Jul 2018 21:20:47 +0900 Masami Hiramatsu wrote: > Add a testcase for max stack tracer, which checks basic > max stack usage tracing and its filter feature. > Hmm, this test sometimes fails. (not always) Let me check what happens. Thank you, > Signed-off-by: Masami Hiramatsu > --- > .../ftrace/test.d/ftrace/func_stack_tracer.tc | 39 ++++++++++++++++++++ > 1 file changed, 39 insertions(+) > create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc > > diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc > new file mode 100644 > index 000000000000..b414f0e3c646 > --- /dev/null > +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_stack_tracer.tc > @@ -0,0 +1,39 @@ > +#!/bin/sh > +# SPDX-License-Identifier: GPL-2.0 > +# description: ftrace - Max stack tracer > +# Test the basic function of max-stack usage tracing > + > +if [ ! -f stack_trace ]; then > + echo "Max stack tracer is not supported - please make CONFIG_STACK_TRACER=y" > + exit_unsupported > +fi > + > +echo > stack_trace_filter > +echo 0 > stack_max_size > +echo 1 > /proc/sys/kernel/stack_tracer_enabled > + > +: "Fork and wait for the first entry become !lock" > +timeout=10 > +while [ $timeout -ne 0 ]; do > + ( echo "forked" ) > + FL=`grep " 0)" stack_trace` > + echo $FL | grep -q "lock" || break; > + timeout=$((timeout - 1)) > +done > +echo 0 > /proc/sys/kernel/stack_tracer_enabled > + > +echo '*lock*' > stack_trace_filter > +test `cat stack_trace_filter | wc -l` -eq `grep lock stack_trace_filter | wc -l` > + > +echo 0 > stack_max_size > +echo 1 > /proc/sys/kernel/stack_tracer_enabled > + > +: "Fork and always the first entry including lock" > +timeout=10 > +while [ $timeout -ne 0 ]; do > + ( echo "forked" ) > + FL=`grep " 0)" stack_trace` > + echo $FL | grep -q "lock" > + timeout=$((timeout - 1)) > +done > +echo 0 > /proc/sys/kernel/stack_tracer_enabled > -- Masami Hiramatsu