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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