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

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Message-ID: <4DB86A2D.3030406@codeaurora.org>
Date:	Wed, 27 Apr 2011 12:10:37 -0700
From:	Michael Bohan <mbohan@...eaurora.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	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 4/27/2011 11:26 AM, Frederic Weisbecker wrote:
> On Wed, Apr 27, 2011 at 10:38:50AM -0700, H. Peter Anvin wrote:
>>
>> How big of a win, if any, is this, really?
>
> That's pretty significant, because if you can disable breakpoints,
> then you can disable perf. Together they make quite a chunk.

Another advantage is the ability to disable these features for kernel 
bringup on new targets and kernel versions. Recently in v2.6.38 
hw_breakpoints were broken in ARM. A change like this would have saved 
me a hack to the Kconfig at the least.

Mike

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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