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 16:12:31 -0700 Message-ID: <20141029231231.GA19344@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: <20141029231106.GB16548-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org> 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-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org, 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 Wed, Oct 29, 2014 at 04:11:06PM -0700, Greg Kroah-Hartman wrote: > On Thu, Oct 30, 2014 at 12:00:16AM +0100, Jiri Kosina wrote: > > On Wed, 29 Oct 2014, Greg Kroah-Hartman wrote: > > > > > kdbus is a kernel-level IPC implementation that aims for resemblance to > > > the the protocol layer with the existing userspace D-Bus daemon while > > > enabling some features that couldn't be implemented before in userspace. > > > > I'd be interested in the features that can't be implemented in userspace > > (and therefore would justify existence of kdbus in the kernel). Could you > > please point me to such list / documentation? > > Lennart has given whole talks about this in the past, here's a recent > talk going into the details: > https://www.youtube.com/watch?v=HPbQzm_iz_k > > > 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, > and isn't easy, or even possible, to do some of the application-specific > bus logic that kdbus provides. See the talk above for details, there > are slides around somewhere with just text that we can add to the cover > letter if that will help out in future spins of this patch series. Here's an article describing it as well: https://lwn.net/Articles/580194/