linux-kernel - Re: How to debug kernel startup time?

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Message-ID: <4e5e476b0903302306n13b84090j2006e89c16735359@mail.gmail.com>
Date:	Tue, 31 Mar 2009 08:06:31 +0200
From:	Corrado Zoccolo <czoccolo@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to debug kernel startup time?

On Sun, Mar 29, 2009 at 6:59 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Sun, 29 Mar 2009 18:45:36 +0200
> Corrado Zoccolo <czoccolo@...il.com> wrote:
>
>> On Sun, Mar 29, 2009 at 5:51 PM, Arjan van de Ven
>> <arjan@...radead.org> wrote:
>> > On Sun, 29 Mar 2009 17:40:10 +0200
>> > Corrado Zoccolo <czoccolo@...il.com> wrote:
>> >
>> >> Hi,
>> >> I'm seeing around 2 s "lost" during kernel boot, that are not
>> >> accounted for any init call (excerpt of dmesg with initcall_debug
>> >> follows, kernel is 2.6.29).
>> >> What's the suggested way to investigate such problems?
>> >
>> > I take it you don't have an initrd ?
>>
>> You guessed right.
>>
>> >
>> > If so I know what you are hitting; I have a patch to solve it but
>> > it's a bit convoluted and not ready for mainline.... let me know if
>> > you want to try it, I suspect it'll solve your issue ;)
>> >
>>
>> Sure. I'd like to test it.
>>
>
> attached...

They worked fine. With fastboot enabled + some ACPI patch that alexei
is working on, I can now boot the kernel in 1.7s.

Corrado

>
> --
> Arjan van de Ven        Intel Open Source Technology Centre
> For development, discussion and tips for power savings,
> visit http://www.lesswatts.org
>



-- 
__________________________________________________________________________

dott. Corrado Zoccolo                          mailto:czoccolo@...il.com
PhD - Department of Computer Science - University of Pisa, Italy
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