From mboxrd@z Thu Jan  1 00:00:00 1970
From: Valdis.Kletnieks@vt.edu
Subject: Re: suspend blockers & Android integration
Date: Mon, 07 Jun 2010 22:15:00 -0400
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To: Linus Walleij <linus.ml.walleij@gmail.com>
Cc: Neil Brown <neilb@suse.de>, tytso@mit.edu, Peter Zijlstra <peterz@infradead.org>, Brian Swetland <swetland@google.com>, Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>, Felipe Balbi <felipe.balbi@nokia.com>, hackbod@android.com, Christoph Hellwig <hch@infradead.org>, Florian Mickler <florian@mickler.org>, James Bottomley <James.Bottomley@suse.de>, "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Linux PM <linux-pm@lists.linux-foundation.org>, Alan Cox <alan@lxorguk.ukuu.org.uk>, Arjan van de Ven <arjan@infradead.org>
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On Tue, 08 Jun 2010 01:17:13 +0200, Linus Walleij said:

> So I would really like to know from the Android people why the
> binder is in the kernel, after all. Could it *theoretically* be in
> userspace, on top of some unix domain sockets, running as a
> real-time scheduled daemon or whatever, still yielding the same
> performance? Or is there some discovered limitation with current
> interfaces, that everybody ought to know?

Not an Android person, but...

How expensive is a userspace->kernel transition on Android-class hardware=
?
There's certainly something to be said for short-circuiting the path
source_process -> kernel -> broker_process -> kernel -> dest_process
down to the shorter source->kernel->dest

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