linux-kernel - Re: [PATCH 3/6] x86: Allow the user not to build hw

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Message-ID: <20110427182633.GB1753@nowhere>
Date:	Wed, 27 Apr 2011 20:26:41 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jason Wessel <jason.wessel@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/6] x86: Allow the user not to build hw_breakpoints

On Wed, Apr 27, 2011 at 10:38:50AM -0700, H. Peter Anvin wrote:
> On 04/27/2011 09:59 AM, Frederic Weisbecker wrote:
> > So that hw_breakpoints and perf can be not built on
> > specific embedded systems.
> 
> How big of a win, if any, is this, really?
> 
> 	-hpa

That's pretty significant, because if you can disable breakpoints,
then you can disable perf. Together they make quite a chunk.

breakpoints + perf:

   text	   data	    bss	    dec	    hex	filename
1567422	 348628	 511680	2427730	 250b52	vmlinux


none:

   text	   data	    bss	    dec	    hex	filename
1478031	 333220	 508256	2319507	 236493	vmlinux
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