linux-kernel - Re: question about CONFIG_BASE

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Date:	Thu, 5 Aug 2010 09:10:21 +0800
From:	Pei Lin <telent997@...il.com>
To:	Mulyadi Santosa <mulyadi.santosa@...il.com>
Cc:	Ryan Wang <openspace.wang@...il.com>, kernelnewbies@...linux.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: question about CONFIG_BASE_SMALL

2010/8/4 Mulyadi Santosa <mulyadi.santosa@...il.com>:
> Hi...
>
> On Wed, Aug 4, 2010 at 15:38, Ryan Wang <openspace.wang@...il.com> wrote:
>> Hi all,
>>
>>      I noticed CONFIG_BASE_SMALL in different parts
>> of the kernel code, with ifdef/ifndef.
>>      I wonder what does CONFIG_BASE_SMALL mean?
>> And how can I configure it, e.g. through make menuconfig?
>
> Reply on top of my head: IIRC it means to disable certain things...or
> possibly enabling things that might reduce memory footprints.
>
> The goal....to make Linux kernel running more suitable for embedded
> system and low level specification machine...
>
FYI.

Date:	Mon, 31 Jan 2005 01:25:51 -0600
To: Andrew Morton <akpm@...l.org>

This patch series introduced a new pair of CONFIG_EMBEDDED options call
CONFIG_BASE_FULL/CONFIG_BASE_SMALL. Disabling CONFIG_BASE_FULL sets
the boolean CONFIG_BASE_SMALL to 1 and it is used to shrink a number
of core data structures. The space savings for the current batch is
around 14k.
-

For example , look at the file "Linux/include/linux/udp.h"
http://lxr.free-electrons.com/source/include/linux/udp.h

#define UDP_HTABLE_SIZE_MIN             (CONFIG_BASE_SMALL ? 128 : 256)


> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
> --
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-- 
Best Regards
Lin
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