From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH 00/12] Add kdbus implementation Date: Wed, 29 Oct 2014 16:34:38 -0700 Message-ID: <20141029233438.GA16520@kroah.com> References: <1414620056-6675-1-git-send-email-gregkh@linuxfoundation.org> <20141029231106.GB16548@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jiri Kosina Cc: linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, arnd-r2nGTMty4D4@public.gmane.org, tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Marcel Holtmann , desrt-0xnayjDhYQY@public.gmane.org, hadess-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org, dh.herrmann-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, tixxdz-Umm1ozX2/EEdnm+yROfE0A@public.gmane.org, simon.mcvittie-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org, daniel-cYrQPVfZoowdnm+yROfE0A@public.gmane.org, alban.crequy-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org, javier.martinez-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org, teg-B22kvLQNl6c@public.gmane.org List-Id: linux-api@vger.kernel.org On Thu, Oct 30, 2014 at 12:26:33AM +0100, Jiri Kosina wrote: > On Thu, 30 Oct 2014, Jiri Kosina wrote: > > > > > It seems to me that most of the highlight features from the cover letter > > > > can be "easily" (for certain definition of that word, of course) > > > > implemented in userspace (vmsplice(), sending fd through unix socket, user > > > > namespaces, UUID management, etc). > > > > > > We have dbus in userspace today, but that requires extra copies of data, > > > > But we can do zero-copy between processess for quite some time already, so > > what exactly is the issue here? > > > > > and isn't easy, or even possible, to do some of the application-specific > > > bus logic that kdbus provides. > > > > I unfortunately have absolutely no idea what should I imagine here. > > Also, I think I have heard that binder is going out of staging now, right? Yes, but that needs documentation, which I'm working on at the moment :) > I admittedly have very limited understanding of both binder and kdbus, but > I guess that is the case for many folks. My understanding is that they are > providing very similar functionality, so explanation why we need *both* in > the kernel would be very interesting as well. They do very different things, see this writeup I did a while ago about the differences between them: http://kroah.com/log/blog/2014/01/15/kdbus-details/ thanks, greg k-h