linux-kernel - Re: [PATCH 1/2] Colored kernel output (run3)

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Message-ID: <20071007164452.GA30429@elte.hu>
Date:	Sun, 7 Oct 2007 18:44:52 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Verych <olecom@...wer.upol.cz>
Subject: Re: [PATCH 1/2] Colored kernel output (run3)


Jan,

> This patch makes it possible to give kernel messages a selectable 
> color. It can be chosen at compile time, overridden at boot time, and 
> changed at run time.

here's some (good) text footprint data:

with the feature disabled (which is the default), the text size 
difference with patch #1:

  vmlinux:
     text    data     bss     dec     hex filename
  7732358 1157269  401408 9291035  8dc51b vmlinux.before
  7732358 1157269  401408 9291035  8dc51b vmlinux.after

i.e. no overhead. Text size difference with patch #2:

  vmlinux:
     text    data     bss     dec     hex filename
  7732358 1157269  401408 9291035  8dc51b vmlinux.before
  7732374 1157269  401408 9291051  8dc52b vmlinux.after

16 bytes, or 0.0002% of the total text size. So there's in essence no 
text overhead to talk about. So the text overhead argument is a red 
herring.

	Ingo
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