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Date: Wed, 30 Oct 2002 10:42:54 +0000
From: Padraig Brady <padraig.brady@corvil.com>
Organization: Corvil Networks
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To: Khalid Aziz <khalid_aziz@hp.com>
CC: Paul.Clements@steeleye.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.5] Retrieve configuration information from kernel
References: <Pine.LNX.4.10.10210291204590.28595-100000@clements.sc.steeleye.com> <3DBED111.96A3A1E8@hp.com>
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Khalid Aziz wrote:
> Paul Clements wrote:
> 
>>Have you considered compressing the config info in order to reduce
>>the space wastage in the loaded kernel image? Could easily be 10's of KB
>>(not that that's a lot these days). The info would then be retrieved via
>>"gunzip -c", et al. instead of a simple "cat".
> 
> I wanted to start with a simple implementation first. There are a couple
> of things that can be done in future to further improve meory usage: (1)
> Drop "CONFIG_" and "# CONFIG_" from each line and add it back when
> printing from /proc/ikconfig and extract-ikconfig script, (2) Compress
> the resulting configuration. Something to do in near future :)

$ wc -c /usr/src/linux-2.4/.config
   38092 /usr/src/linux-2.4/.config
$ gzip -c /usr/src/linux-2.4/.config | wc -c
   10305
$ sed '/^ *$/d;/^#/d;s/^CONFIG_//'  /usr/src/linux-2.4/.config | wc -c
   17267
$ sed '/^ *$/d;/^#/d;s/^CONFIG_//'  /usr/src/linux-2.4/.config | gzip | wc -c
    6155

Also it seems like it would be more useful to have the config in the
kernel image rather than (just) proc?

P?draig.

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