linux-kernel - Re: [tip:x86/urgent] x86, trace: Fix CR2 corruption when tracing page faults

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Message-ID: <20140305122535.GA9987@twins.programming.kicks-ass.net>
Date:	Wed, 5 Mar 2014 13:25:35 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...nel.org, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, acme@...stprotocols.net,
	seiji.aguchi@....com, jolsa@...hat.com, vincent.weaver@...ne.edu,
	tglx@...utronix.de, hpa@...ux.intel.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86, trace: Fix CR2 corruption when tracing
 page faults

On Wed, Mar 05, 2014 at 07:20:22AM -0500, Steven Rostedt wrote:
> On Wed, 5 Mar 2014 12:14:15 +0100
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> Please no! I used tracing of the do_page_fault function all the time.
> It is very useful.

Why do you trace do_page_fault and not the __do_page_fault() function?
do_page_fault() is a minimal wrapper which doesn't actually do all that
much?
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