From owner-svn-src-stable@FreeBSD.ORG Tue Mar 1 17:47:41 2011 Return-Path: Delivered-To: svn-src-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A2CA2106566B; Tue, 1 Mar 2011 17:47:41 +0000 (UTC) (envelope-from rwatson@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 7948B8FC17; Tue, 1 Mar 2011 17:47:41 +0000 (UTC) Received: from lemongrass.sec.cl.cam.ac.uk (lemongrass.sec.cl.cam.ac.uk [128.232.18.47]) by cyrus.watson.org (Postfix) with ESMTPSA id AB04446B2E; Tue, 1 Mar 2011 12:47:40 -0500 (EST) Mime-Version: 1.0 (Apple Message framework v1082) Content-Type: text/plain; charset=us-ascii From: "Robert N. M. Watson" In-Reply-To: Date: Tue, 1 Mar 2011 17:47:39 +0000 Content-Transfer-Encoding: quoted-printable Message-Id: References: <201102282328.p1SNSZZK059958@svn.freebsd.org> To: Ryan Stone X-Mailer: Apple Mail (2.1082) Cc: svn-src-stable@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, svn-src-stable-8@freebsd.org Subject: Re: svn commit: r219107 - in stable/8/sys: amd64/amd64 amd64/include boot/common cddl/compat/opensolaris/kern cddl/compat/opensolaris/sys cddl/contrib/opensolaris/uts/common/dtrace cddl/contrib/opensol... X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Mar 2011 17:47:41 -0000 On 1 Mar 2011, at 16:55, Ryan Stone wrote: > I'm a bit confused. The 8.2 release notes claim that userland dtrace > support was added to 8.2. Is this incorrect? >=20 > http://www.freebsd.org/releases/8.2R/relnotes.html >=20 > Userland support for the dtrace(1) subsystem has been added. This > allows inspection of userland software itself and its correlation with > the kernel, thus allowing a much better picture of what exactly is > going on behind the scenes. The dtruss(1) utility has been added and > libproc has been updated to support the facility.[r214983] I think that's accurate but slightly misleading; the description of what = is possible above was the case in 8.2, but there was a significant chunk = of stuff not in 8.2 that I would also think of as part of userland = dtrace. So dtruss(1) worked fine, but that relies on tracing of kernel = bits, whereas the userland dtrace stuff I just MFC'd has to do with = userspace components (such as applications, language runtimes, and so = on) can expose their own probes, and be instrumented. So perhaps I = should have said "even more userland DTrace", but realistically, this = was a significant part of what most people would call userland DTrace. Robert=