linux-kernel - Re: [PATCH 00/12] Add kdbus implementation

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Date:	Thu, 30 Oct 2014 00:26:33 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
cc:	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	john.stultz@...aro.org, arnd@...db.de, tj@...nel.org,
	Marcel Holtmann <marcel@...tmann.org>, desrt@...rt.ca,
	hadess@...ess.net, dh.herrmann@...il.com, tixxdz@...ndz.org,
	simon.mcvittie@...labora.co.uk, daniel@...que.org,
	alban.crequy@...labora.co.uk, javier.martinez@...labora.co.uk,
	teg@...m.no
Subject: Re: [PATCH 00/12] Add kdbus implementation

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?

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.

-- 
Jiri Kosina
SUSE Labs

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