linux-kernel - Re: [patch 5/3] fastboot: sync the async execution before late

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Date:	Wed, 30 Jul 2008 10:08:42 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Simon Arlott <simon@...e.lp0.eu>
cc:	Rene Herman <rene.herman@...access.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	<linux-kernel@...r.kernel.org>, <mingo@...e.hu>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [patch 5/3] fastboot: sync the async execution before late_initcall
 and move level 6s (sync) first

On Tue, 29 Jul 2008, Simon Arlott wrote:

> It doesn't appear to be possible to init multiple PCI devices at once... 
> I haven't looked into what is doing it exactly but presumably there's a 
> lock being held over the whole device probe process.
> 
> The speedup from usb seems to be primarily from initialising devices in 
> the background... perhaps there's some way to do that without doing hcd 
> init from a second thread?

You could provide useful details by booting a kernel with
CONFIG_USB_DEBUG enabled.

The USB stack _already_ initializes USB devices (i.e., not host
controllers) in a separate thread.

Alan Stern

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