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

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Message-ID: <48923EA6.7040406@simon.arlott.org.uk>
Date:	Thu, 31 Jul 2008 23:37:26 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Greg KH <greg@...ah.com>, Alan Stern <stern@...land.harvard.edu>,
	Rene Herman <rene.herman@...access.nl>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Daniel Walker <dwalker@...sta.com>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: [patch 5/3] fastboot: sync the async execution before late_initcall
 and move level 6s (sync) first

On 31/07/08 23:12, Simon Arlott wrote:
> On 31/07/08 22:56, Greg KH wrote:
>> On Thu, Jul 31, 2008 at 07:29:21PM +0100, Simon Arlott wrote:
>>>>> There is nothing else to run between 1-2 and 3, so there is no 
>>>>> opportunity
>>>>> to initialise devices in the background and usblp_init blocks for a 
>>>>> while.
>>>> If it were a module then it would block in a separate thread and 
>>>> wouldn't hold up the main init process.
>>>
>>> Right, but I want to compile all of this into the kernel.
>>
>> Why?  It sounds like a trivial solution for you is to actually use
>> modules.  Why go through a lot of extra work to solve something in a
>> different way that is already solved for you?
> 
> Because it looks like doing HCD init early enough is a simple way to 
> speed up boot time if there are any compiled-in usb device drivers, 
> without running the HCD init itself from a separate thread.
> 
> Arjan, are you able to test this?
> I'll try doing what I've suggested later tonight if I have time.

I've tested this with fastboot disabled, the hcd initcalls changed 
back to module_init, all my drivers changed to late_initcall to 
force them to be later while usb/ is before net/ in the drivers/ 
Makefile.

-- 
Simon Arlott

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