Subject: Re: [patch 00/2] improve .text size on gcc 4.0 and newer  compilers
From: Arjan van de Ven <arjan@infradead.org>
To: Martin Bligh <mbligh@mbligh.org>
Cc: Matt Mackall <mpm@selenic.com>, Chuck Ebbert <76306.1226@compuserve.com>,
       Adrian Bunk <bunk@stusta.de>, Andrew Morton <akpm@osdl.org>,
       Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@osdl.org>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Dave Jones <davej@redhat.com>,
       Tim Schmielau <tim@physik3.uni-rostock.de>
In-Reply-To: <43BD5E6F.1040000@mbligh.org>
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	 <20060105170255.GK3356@waste.org>  <43BD5E6F.1040000@mbligh.org>
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Date: Thu, 05 Jan 2006 19:09:36 +0100
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> There are tools already around to do this sort of thing as well - 
> "profile directed optimization" or whatever they called it. Seems to be 
> fairly commonly done with userspace, but not with the kernel. I'm not 
> sure why not ... possibly because it's not available for gcc ?

gcc has this for sure
the problem is that it expects the profile info in a special format
that.. gets written to a file. So to do it in the kernel you need
SomeMagic(tm), for example to use the kernel profiler but to let it
output it somehow in a gcc compatible format.


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