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

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Date:	Fri, 19 Jun 2009 12:20:31 -0700
From:	Brian Swetland <swetland@...gle.com>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Greg Kroah-Hartman <greg@...ah.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] staging: android: binder: Remove some funny && usage

2009/6/17 Daniel Walker <dwalker@...o99.com>:
> On Wed, 2009-06-17 at 14:26 -0700, Arve Hjønnevåg wrote:
>> On Wed, Jun 17, 2009 at 9:31 AM, Jeremy Fitzhardinge<jeremy@...p.org> wrote:
>> > On 06/17/09 09:08, Daniel Walker wrote:
>> ...
>> > Also, what its usermode ABI is, how stable it is, whether its generally
>> > useful, does it have glibc/other library support, etc.  Would you ever want
>> > to use this in a non-Android context?
>>
>> You could use this in a non-android context, but the abi is not
>> stable. There is some documentaion of the current user space api at
>> http://developer.android.com/reference/android/os/IBinder.html. You
>> can also find more information at http://www.open-binder.org/ which is
>> where the api came from.
>
> Why does all this need to be done in the kernel? Couldn't any of the
> current IPC mechanisms be re-used to accomplish this?

Arve can probably go into more detail here, but I believe the two
notable properties of the binder that are not present in existing IPC
mechanisms in the kernel (that I'm aware of) are:
- avoiding copies by having the kernel copy from the writer into a
ring buffer in the reader's address space directly (allocating space
if necessary)
- managing the lifespan of proxied remoted userspace objects that can
be shared and passed between processes (upon which the userspace
binder library builds its remote reference counting model)

Brian
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