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Message-ID: <c62985530810031059v5ed44e04qebaf9453710e76c1@mail.gmail.com>
Date: Fri, 3 Oct 2008 19:59:08 +0200
From: "=?ISO-8859-1?Q?Fr=E9d=E9ric_Weisbecker?=" <fweisbec@gmail.com>
To: "Alan Jenkins" <aj504@student.cs.york.ac.uk>
Subject: Re: [PATCH -tip] Tracing/fastboot: Only trace non-module initcalls
Cc: "Ingo Molnar" <mingo@elte.hu>, linux-kernel@vger.kernel.org,
       "Arjan van de Ven" <arjan@infradead.org>
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2008/10/3 Alan Jenkins <aj504@student.cs.york.ac.uk>:
> Sorry to butt in.  I think tracing module initcalls was a deliberate addition by Arjan (a06e1c2b448b317bc141934879cbbbed8319b4d4).
>
> Maybe you use an initrd and that affects the trace?  It would be nice to see the "before" svg as well as the "after", to explain the change.
>
> Thanks
> Alan


Hi Alan,

The script bootgraph.pl in -tip stops the analyzing when it sees
"Freeing unused kernel memory". That's
exactly when the built-in initcalls are finished.
And as a result, the graph produced with dmesg always finishes at this point.

If you try to generate a graph whithout this limitation, you will not
be able to see something interesting because
the script will not find a lot of initcalls with a long enough time
proportion against the total boot time.
Perhaps it can be improved in that way but unfortunately I don't know
any word in Perl....