linux-kernel - Re: [PATCH 1/6] staging: android: binder: Remove some funny && usage

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Date:	Fri, 19 Jun 2009 17:49:00 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Brian Swetland <swetland@...gle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	linux-kernel@...r.kernel.org, hackbod@...roid.com
Subject: Re: [PATCH 1/6] staging: android: binder: Remove some funny &&
	usage

On Fri, 2009-06-19 at 17:13 -0700, Arve Hjønnevåg wrote:
> 
> > Also are there any userspace test cases
> > that Google used to test the performance of this interface. Or test
> > cases to compare the binder with something like sockets, or any other
> > type of IPC?
> >
> > If Google believes the binder is the right solution for IPC, how was
> > that conclusion formed?
> >
> > Daniel
> 
> These are mostly questions for the framework team. The binder driver
> is there to support our user space code. At some point we used the
> driver from www.open-binder.org, but we ran into, and fixed, a lot of
> bugs (especially when processes died), so we determined it would be
> faster to rewrite the driver from scratch.

Most of these questions related to the fact that I don't think an
interface like this just slips into the kernel as a driver. Since it's
IPC, it's totally generic, and it's not part of a standard (i.e. POSIX),
we need to have some better and more specific information about it (or
atleast I do). 

If for instance the main reason for Google using this interface is cause
a large number of android people once worked at Palm or BeOS, that's not
reason enough for it to go into the kernel. Or if this binder interface
really fits well with Java or C++ people and they just love it, that's
not really acceptable either..

Daniel

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