linux-kernel - Re: [PATCH 6/6] x86: Allow disabling HW_BREAKPOINTS and PERF

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Message-ID: <20131006164934.GA15167@gmail.com>
Date:	Sun, 6 Oct 2013 18:49:34 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, peterz@...radead.org,
	Andi Kleen <ak@...ux.intel.com>, fweisbec@...il.com
Subject: Re: [PATCH 6/6] x86: Allow disabling HW_BREAKPOINTS and PERF_EVENTS


* Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> As suggested by Ingo.
> 
> Make HW_BREAKPOINTS a config option. HW_BREAKPOINTS depends
> on perf. This allows disabling PERF_EVENTS for systems that
> don't need it (e.g. anything not used for development)
> 
> Disabling PERF_EVENTS saves over 700k of kernel text (~5% of my config)
> and significant data/bss:
> 
>    text	   data	    bss	    dec	    hex	filename
> 13692640	1922416	1478656	17093712	104d450	obj/vmlinux
> 12980092	1787544	1470464	16238100	 f7c614	obj-noperf/vmlinux

Btw., could you send me your .config so I can investigate this?

Thanks,

	Ingo
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