linux-kernel - Re: [linux-pm] suspend blockers & Android integration

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Date:	Mon, 07 Jun 2010 22:15:00 -0400
From:	Valdis.Kletnieks@...edu
To:	Linus Walleij <linus.ml.walleij@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Brian Swetland <swetland@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Florian Mickler <florian@...kler.org>,
	Vitaly Wool <vitalywool@...il.com>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Arjan van de Ven <arjan@...radead.org>, tytso@....edu,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, Neil Brown <neilb@...e.de>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Felipe Balbi <felipe.balbi@...ia.com>, hackbod@...roid.com
Subject: Re: [linux-pm] suspend blockers & Android integration

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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