From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23183 invoked by alias); 12 Jan 2009 20:32:04 -0000 Received: (qmail 23085 invoked by uid 22791); 12 Jan 2009 20:32:03 -0000 X-SWARE-Spam-Status: No, hits=-0.7 required=5.0 tests=AWL,BAYES_50,KAM_MX,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (66.187.233.31) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 12 Jan 2009 20:31:31 +0000 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n0CKVTeJ016008 for ; Mon, 12 Jan 2009 15:31:29 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id n0CKVUkf031680 for ; Mon, 12 Jan 2009 15:31:30 -0500 Received: from ton.toronto.redhat.com (ton.yyz.redhat.com [10.15.16.15]) by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id n0CKVTRk001828; Mon, 12 Jan 2009 15:31:29 -0500 Received: from ton.toronto.redhat.com (localhost.localdomain [127.0.0.1]) by ton.toronto.redhat.com (8.13.1/8.13.1) with ESMTP id n0CKVSOS023168; Mon, 12 Jan 2009 15:31:28 -0500 Received: (from fche@localhost) by ton.toronto.redhat.com (8.13.1/8.13.1/Submit) id n0CKVSKU023167; Mon, 12 Jan 2009 15:31:28 -0500 Date: Mon, 12 Jan 2009 20:32:00 -0000 From: "Frank Ch. Eigler" To: Theodore Tso Cc: Jason Baron , Masami Hiramatsu , Roland McGrath , systemtap@sources.redhat.com Subject: Re: Discussion at Linux Foundation Japan Symposium Message-ID: <20090112203128.GH18407@redhat.com> References: <20081221003831.GG24081@redhat.com> <20081222181921.GH23723@mit.edu> <20081222203747.GA4195@redhat.com> <20081223211306.67D29FC3B7@magilla.sf.frob.com> <20081223223217.GW23723@mit.edu> <49518856.80907@redhat.com> <20090110024810.GL23869@mit.edu> <20090112190401.GE3107@redhat.com> <20090112195159.GJ21793@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090112195159.GJ21793@mit.edu> User-Agent: Mutt/1.4.1i 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: 2009-q1/txt/msg00106.txt.bz2 HI - On Mon, Jan 12, 2009 at 02:51:59PM -0500, Theodore Tso wrote: > [...] > > We have been actively looking at and adding tracepoints to the lttng > > kernel tree via the ltt-dev list to support Systemtap. [...] > Huh? Last I checked Systemtap didn't support tracepoints at all. Did > I miss something? Not *directly*. Just like lttng, systemtap can currently use tracepoints via a hand-written intermediary module that maps them to markers. > Also, the trace points won't necessarily be helpd up for merge until > lttng is proposed for merge. [...] > > So what Linus Torvalds and other senior kernel developers proposed at > the Kernel Summit was a simple debugfs/proc interface which would > allow individual activation of a tracepoint/marker, and which would > dump out the data collected by that marker as a simple text file > accessed via a pseudo-filesystem. Consider acking http://lkml.org/lkml/2008/12/30/297, a widget that aims to connect generic markers to ftrace. - FChE