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

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Message-ID: <4883ACBB.4080303@simon.arlott.org.uk>
Date:	Sun, 20 Jul 2008 22:23:07 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Daniel Walker <dwalker@...sta.com>
CC:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	Rene Herman <rene.herman@...access.nl>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [patch 5/3] fastboot: sync the async execution before late_initcall
 and move level 6s (sync) first

On 20/07/08 22:14, Daniel Walker wrote:
> On Sun, 2008-07-20 at 09:00 -0700, Arjan van de Ven wrote:
>> @@ -775,6 +776,11 @@ static void __init do_initcalls(void)
>>                 }
>>                 if (phase == 1 && call >= __async_initcall_end)
>>                         phase = 2;
>> +               if (phase == 2 && call >= __device_initcall_end) {
>> +                       phase = 3;
>> +                       /* make sure all async work is done before level 7 */
>> +                       flush_workqueue(async_init_wq);
>> +               }
>>                 if (phase != 1)
>>                         do_one_initcall(*call);
>>         }
> 
> Did this impact the boot time improvements at all?

The USB HCD initcalls take so little time to complete (100ms 
each) that ensuring they have finished makes no difference.

USB devices get detected after those initcalls finish in 
parallel with the rest of the boot process (and there's 
about 1.5s before the first USB device driver initcall 
runs).

-- 
Simon Arlott
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