Date: Wed, 1 Sep 2004 21:27:55 +0200
From: Sam Ravnborg <sam@ravnborg.org>
To: Paulo Marques <pmarques@grupopie.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>, Matt Mackall <mpm@selenic.com>
Subject: Re: [PATCH] kallsyms: speed up /proc/kallsyms
Message-ID: <20040901192755.GC7219@mars.ravnborg.org>
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	Rusty Russell <rusty@rustcorp.com.au>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>, Matt Mackall <mpm@selenic.com>
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On Wed, Sep 01, 2004 at 12:17:18PM +0100, Paulo Marques wrote:
 
> So, moving forward...
> 
> A defconfig build produces 13743 symbols with a compressed name stream
> of ~130kB. (it is 240kB uncompressed, for the curious)
> 
> Adding a letter to each symbol would increase this by about 10%.
> 
> We can try 2 different approaches to minimize the impact of this:
> 
>  - have the letter inserted before the compression step. This way, the
>    table of the best tokens may have "tacpi_" instead of "acpi_" and
>    the compression would not suffer as much, except that the symbols
>    started with "Tacpi_" would suffer. Only real tests can show how
>    this would turn out.
> 
>  - build a "sections" table that groups together symbols with the same
>    letter. The table would say symbols that have addresses between
>    X and Y would have letter Z. This can go horribly wrong if there
>    are situations where completely different type letters appear
>    intermixed.
> 
> I think I'll try the first approach first and see how it goes. I'll
> post as soon as I got some numbers.

When you have made the split Rusty requested and implemented
the above could you please send patches to me. I will add them to
my kbuild queue.

Yes - I have acccepted your rationale why to keep the split
of functionality between kallsyms and the kernel.

	Sam
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