Re: 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