From owner-freebsd-current@FreeBSD.ORG Sun Sep 21 13:38:26 2008 Return-Path: Delivered-To: current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3D3491065670; Sun, 21 Sep 2008 13:38:26 +0000 (UTC) (envelope-from nox@saturn.kn-bremen.de) Received: from gwyn.kn-bremen.de (gwyn.kn-bremen.de [212.63.36.242]) by mx1.freebsd.org (Postfix) with ESMTP id EC7BE8FC13; Sun, 21 Sep 2008 13:38:25 +0000 (UTC) (envelope-from nox@saturn.kn-bremen.de) Received: by gwyn.kn-bremen.de (Postfix, from userid 10) id 2B1B9191A2E; Sun, 21 Sep 2008 15:11:14 +0200 (CEST) Received: from saturn.kn-bremen.de (noident@localhost [127.0.0.1]) by saturn.kn-bremen.de (8.14.2/8.13.8) with ESMTP id m8LD9evA065210; Sun, 21 Sep 2008 15:09:40 +0200 (CEST) (envelope-from nox@saturn.kn-bremen.de) Received: (from nox@localhost) by saturn.kn-bremen.de (8.14.2/8.13.6/Submit) id m8LD9dNl065209; Sun, 21 Sep 2008 15:09:39 +0200 (CEST) (envelope-from nox) Date: Sun, 21 Sep 2008 15:09:39 +0200 (CEST) From: Juergen Lock Message-Id: <200809211309.m8LD9dNl065209@saturn.kn-bremen.de> To: lme@FreeBSD.org X-Newsgroups: local.list.freebsd.current In-Reply-To: <20080919114528.5yzyki2ry8044g4s@0x20.net> References: <20080917101013.GA90749@freebsd.org> <20080918211652.GB19958@what-creek.com> Organization: home X-Mailman-Approved-At: Sun, 21 Sep 2008 13:59:07 +0000 Cc: Roman Divacky , jb@FreeBSD.org, John Birrell , current@FreeBSD.org Subject: Re: dtrace status X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Sep 2008 13:38:26 -0000 In article <20080919114528.5yzyki2ry8044g4s@0x20.net> you write: >Quoting John Birrell : > >> On Wed, Sep 17, 2008 at 12:10:13PM +0200, Roman Divacky wrote: >>> Dtrace was commited 3 months ago and the only things that prevents >>> using it "out of the box" is building kernel with WITH_CTF=1. >>> >>> When is this going to be enabled on default. What is preventing this >>> from happening? >> >> I wonder whether people generally want it enabled by default. > >If it doesn't slow anything down, then why not? > At least on 7-stable (I didn't try HEAD) kgdb doesn't seem to like dtrace bits in the kernel, backtraces look like from a kernel without debug symbols... Also there seem to be issues with fbt probes, http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/045180.html and SMP support at least on amd64, http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/045093.html >Are there any FreeBSD specific docs on this? Maybe a short article for >/usr/share/doc or a new chapter for the handbook? :-) I dunno about FreeBSD specific, but I liked this presentation: http://video.google.com/videoplay?docid=-8002801113289007228&ei=XLPNSMv5KpKw2QKysZzBAg&q=dtrace (video is called Dtrace Review if you need to search it.) Thanx, Juergen