From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18879 invoked by alias); 27 Feb 2012 21:54:42 -0000 Received: (qmail 18870 invoked by uid 22791); 27 Feb 2012 21:54:41 -0000 X-SWARE-Spam-Status: No, hits=-6.6 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 27 Feb 2012 21:54:22 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q1RLsM3e010335 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 27 Feb 2012 16:54:22 -0500 Received: from toonder.wildebeest.org (ovpn-116-39.ams2.redhat.com [10.36.116.39]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id q1RLsL1k007770 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 27 Feb 2012 16:54:22 -0500 Received: by toonder.wildebeest.org (Postfix, from userid 1000) id BEAD828818; Mon, 27 Feb 2012 22:54:20 +0100 (CET) Date: Mon, 27 Feb 2012 21:54:00 -0000 From: Mark Wielaard To: William Cohen Cc: David Smith , systemtap@sourceware.org Subject: Re: Recent review of SystemTap test results on ARM running Fedora 15 hard float. Message-ID: <20120227215420.GB6644@toonder.wildebeest.org> References: <4F468E22.4010308@redhat.com> <4F46A795.8000307@redhat.com> <4F46B861.5060201@redhat.com> <4F46C3F8.7080900@redhat.com> <4F47B4E4.2080803@redhat.com> <4F47D662.9000509@redhat.com> <4F47E4AF.1010205@redhat.com> <20120225193939.GA32752@toonder.wildebeest.org> <4F4BA237.2050709@redhat.com> <1330359008.2736.60.camel@springer.wildebeest.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1330359008.2736.60.camel@springer.wildebeest.org> User-Agent: Mutt/1.5.21 (2010-09-15) Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2012-q1/txt/msg00205.txt.bz2 On Mon, Feb 27, 2012 at 05:10:08PM +0100, Mark Wielaard wrote: > On Mon, 2012-02-27 at 10:33 -0500, William Cohen wrote: > > Does this this test need the uprobes support for this test to work? > > Maybe... I am a little fuzzy on the details of when/how vma tracking is > triggered. Technically vma tracking doesn't need uprobes. But it might > be that vma tracking is only enabled/started if uprobes are active. You > might have to look with -DDEBUG_TASK_FINDER_VMA to see what is > happening. I poked a bit myself on an arm setup. The vma tracker doesn't need uprobes, but it does need the task finder, and runtime.h says: #if (defined(CONFIG_UTRACE) || defined(STAPCONF_UTRACE_VIA_TRACEPOINTS) \ || defined(STAPCONF_UTRACE_VIA_FTRACE)) #define HAVE_TASK_FINDER #endif So you do need some form of UTRACE. Unfortunately my setup doesn't have that. Does your kernel? Cheers, Mark