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    SubjectRe: [PATCH 00/12] Add kdbus implementation
    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

    I think it's a reasonable expectation that kernel patch submissions should
    be reasonably self-contained though. We've always been very strict about
    pushing everybody to provide extensive cover letters, changelogs and
    explanations, so this shouldn't really be an exception, I think.

    > > 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.

    > 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.

    I think that would be very helpful. Thanks.

    --
    Jiri Kosina
    SUSE Labs



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