linux-kernel - Re: [2.6.18-rc7-mm1] slow boot

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Date:	Wed, 04 Oct 2006 08:05:55 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <ak@...e.de>
Cc:	<tilman@...p.cc>, "Andrew Morton" <akpm@...l.org>,
	<linux-kernel@...r.kernel.org>,
	"Randy Dunlap" <rdunlap@...otime.net>
Subject: Re: [2.6.18-rc7-mm1] slow boot

>>> Ingo Molnar <mingo@...e.hu> 29.09.06 20:39 >>>
>
>* Andi Kleen <ak@...e.de> wrote:
>
>> "Jan Beulich" <jbeulich@...ell.com> writes:
>> 
>> > There's nothing stack trace/unwind related among the functions listed at all afaics.
>> > I don't know much about how profiling works, is it perhaps just missing something?
>> 
>> Perhaps lockdep calls them with interrupts off? The old profiler 
>> doesn't support profiling with interrupts off. oprofile does, but it 
>> cannot be used at early boot.
>
>Yes, lockdep does everything that changes the dependency graph(s) with 
>irqs off. Jan, i bounced you the mail with the function traces included, 
>that should show you the overhead points.

Okay, makes sense then. I'll get to addressing the (already identified) cause
as soon as I can.

Jan
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