linux-kernel - Re: Help text for config OPTIMIZE

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Date:	Sat, 11 Oct 2008 16:36:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sitsofe Wheeler <sitsofe@...oo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Help text for config OPTIMIZE_INLINING


* Sitsofe Wheeler <sitsofe@...oo.com> wrote:

> The main help text for the OPTIMIZE_INLINING kconfig option says: "The 
> gcc 4.x series have a rewritten inlining algorithm and disabling this 
> option will generate a smaller kernel there."
> 
> That suggests that to generate a smaller kernel one should set the 
> option to n. However the short text says: "Allow gcc to uninline 
> functions marked 'inline'"
> 
> While suggests that one should set it to y to generate smaller 
> kernels. My own experience says that setting it to y DOES generate a 
> smaller kernel so perhaps the main text should be changed to reflect 
> this?

sure, could you send a patch (with lkml Cc:-ed) that does this?

Also, would be nice if you sent with/without vmlinux size numbers for 
the config you are using. Btw., do you have 
CONFIG_CC_OPTIMIZE_FOR_SIZE=y enabled as well? That too shrinks the 
kernel (which speeds it up as well on moder CPUs), quite visibly.

	Ingo
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