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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.44L0.0807301006560.2584-100000@iolanthe.rowland.org>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/