linux-kernel - Re: [ANNOUNCE] pahole and other DWARF2 utilities

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Message-Id: <20061030203334.09caa368.akpm@osdl.org>
Date:	Mon, 30 Oct 2006 20:33:34 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Arnaldo Carvalho de Melo <acme@...driva.com>
Cc:	linux-kernel@...r.kernel.org, lwn@....net
Subject: Re: [ANNOUNCE] pahole and other DWARF2 utilities

On Mon, 30 Oct 2006 18:33:19 -0300
Arnaldo Carvalho de Melo <acme@...driva.com> wrote:

> Hi,
> 
> 	I've been working on some DWARF2 utilities and thought that it
> is about time I announce it to the community, so that what is already
> available can be used by people interested in reducing structure sizes
> and otherwise taking advantage of the information available in the elf
> sections of files compiled with 'gcc -g' or in the case of the kernel
> with CONFIG_DEBUG_INFO enabled, so here it goes the description of said
> tools:
> 
> pahole: Poke-a-Hole is a tool to find out holes in structures, holes
> being defined as the space between members of functions due to alignemnt
> rules that could be used for new struct entries or to reorganize
> existing structures to reduce its size, without more ado lets see what
> that means:
> 
> ...
>
> 	Further ideas on how to use the DWARF2 information include tools
> that will show where inlines are being used, how much code is added by
> inline functions,

It would be quite useful to be able to identify inlined functions which are
good candidates for uninlining.

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