Date: Tue, 1 Mar 2011 17:47:39 +0000 From: "Robert N. M. Watson" <rwatson@freebsd.org> To: Ryan Stone <rysto32@gmail.com> 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... Message-ID: <BF5205BF-CEEB-4477-B1A9-C392C4D9C287@freebsd.org> In-Reply-To: <AANLkTinf9ie0=0B7vo8VO=VXrJwsXkkHURhdJ8Mjjr6Z@mail.gmail.com> References: <201102282328.p1SNSZZK059958@svn.freebsd.org> <AANLkTinf9ie0=0B7vo8VO=VXrJwsXkkHURhdJ8Mjjr6Z@mail.gmail.com>
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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? > > http://www.freebsd.org/releases/8.2R/relnotes.html > > 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. Roberthelp
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