linux-kernel - Re: [PATCH 03/07] kernel.h string cleanup

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Date:	Fri, 26 Feb 2010 17:55:14 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/07] kernel.h string cleanup

On Fri, Feb 26, 2010 at 3:42 PM, Joe Perches <joe@...ches.com> wrote:
> On Fri, 2010-02-26 at 15:33 +0800, Dave Young wrote:
>> It will be better to move some of them to proper place instead of kernel.h
>
> Perhaps you could describe some of the reasons why
> it's better to move them.
>
> Maybe you could post the results of a timed compile
> comparison with kernel.h broken into multiple pieces
> while you're at it.
>

Thanks joe.

Spliting is necessary from my point of view.
It will be more clean to put externs/declarations to their own header files.
At the same time compiling time benifits as well.

printk/panic/string/trace header are splited then included by kernel.h so
just hexdump/int_sqrt are actually seperated.

fresh boot and same .config, make without -j, test result as following:

with the patches applied:

time:
real 15m16.504s
user 12m51.866s
sys 1m39.700s

vmlinux .text size: 003bfcd2

without the patches applied*
time:
real 15m20.518s
user 12m54.120s
sys 1m40.190s

vmlinux .text size: 003bfcea

-- 
Regards
dave
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