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

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Message-ID: <1311251785.29152.141.camel@twins>
Date:	Thu, 21 Jul 2011 14:36:25 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	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 Thu, 2011-07-21 at 09:26 +0200, Ingo Molnar wrote:
> Otherwise we have expressed hw breakpoint APIs via perf events and 
> that model is working well. 

Its working, maybe, working well is pushing it. The whole breakpoint
muck is a horrid mess, it side-steps all of the resource scheduling
stuff of perf and does it itself.

Now part of that is because ptrace requires it, but whichever way you
look at it its damn ugly.
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