linux-kernel - A question sort_main

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Message-ID: <804dabb00811202142y799fb70dxf89a1fc3514d78b1@mail.gmail.com>
Date:	Fri, 21 Nov 2008 13:42:56 +0800
From:	"Peter Teoh" <htmldeveloper@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"Sam Ravnborg" <sam@...nborg.org>
Subject: A question sort_main_extable()

Inside start_kernel() there is a call to sort_main_extable().

void sort_extable(struct exception_table_entry *start,
                 struct exception_table_entry *finish)
{
       sort(start, finish - start, sizeof(struct exception_table_entry),
            cmp_ex, NULL);
}

With reference to
http://tuxology.net/2008/07/08/benchmarking-boot-latency-on-x86/, I
think it can help bootup latency (how much I got no number) if the
sorting is done post-compilation time, instead of dynamically
everytime the system bootup.  (perhaps at the stage of modposting,
when all the vmlinux, kernel modules objects have been generated, so
extracting out the exceptions strings is possible?)  Is this a
possible optimization?

Sam, can it be done?

Thanks.

-- 
Regards,
Peter Teoh
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