Date: Wed, 22 Nov 2006 17:35:49 +0000 From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> To: Kris Kennaway <kris@obsecurity.org> Cc: "Cai, Quanqing" <caiquanqing@gmail.com>, John Birrell <jb@what-creek.com>, freebsd-current@freebsd.org Subject: Re: KDTRACE is gone? Message-ID: <1164216949.18579.19.camel@buffy.york.ac.uk> In-Reply-To: <20061122165735.GA37930@xor.obsecurity.org> References: <2b22951e0611212109t69b01400q5eb0ba15b028ce68@mail.gmail.com> <20061122051359.GA42639@what-creek.com> <20061122165735.GA37930@xor.obsecurity.org>
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On Wed, 2006-11-22 at 11:57 -0500, Kris Kennaway wrote: > On Wed, Nov 22, 2006 at 05:14:00AM +0000, John Birrell wrote: > > On Tue, Nov 21, 2006 at 09:09:21PM -0800, Cai, Quanqing wrote: > > > Today when I tried to compile my customized kernel, I run "config" > > > command and got this: unknown option "KDTRACE". > > > > > > Who can tell me what's going on? > > > > The KDTRACE option can't work the way I intended it to because > > of licensing restrictions. > > By which John means that it could easily be included in FreeBSD under > 'options KDTRACE' as before so that users could actually use DTRACE in > FreeBSD. However, it can't be included in GENERIC since the policy of > FreeBSD is and always has been that GENERIC is a BSD-licensed kernel. > With John's preferred change GENERIC would become under the CDDL. I think this is a shame - having used DTrace under Solaris a fair bit, it's great to know that it is always available. Often, the times I find I need it are exactly the times when I can't reboot to add it into the kernel. I haven't looked at the DTrace code at all - how much code does KDTRACE add to the kernel? Is it possible to write a specification for the code and have somebody else write the kernel parts, like has been done with GPL code in the past? [ I'm not volunteering, I'm just asking if it _could_ be done ] Gavin
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