linux-kernel - Re: Function Profiler broken on today's linux-next

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Message-ID: <20140716164141.GA3016@saruman.home>
Date:	Wed, 16 Jul 2014 11:41:42 -0500
From:	Felipe Balbi <balbi@...com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	<balbi@...com>, <will.deacon@....com>, <mingo@...hat.com>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: Function Profiler broken on today's linux-next

Hi,

On Wed, Jul 16, 2014 at 12:29:21PM -0400, Steven Rostedt wrote:
> On Wed, 16 Jul 2014 11:23:28 -0500
> Felipe Balbi <balbi@...com> wrote:
> 
> > Hi folks,
> > 
> > I was trying to use Kernel Function Profiler to figure out why my
> > driver's IRQ handler is taking so much CPU time but to my surprise,
> > whenever I try to trace anything, I get a "Unable to handle kernel
> > paging request at virtual address XXXX" error.
> > 
> > Is anybody else seen that or did I screw up my Kernel config ?
> 
> No, it's probably my fault. The ftrace infrastructure is going through
> an overhaul and some dramatic changes are happening. Although it has
> passed all my tests, I can't cover everyone's configs and use cases.
> 
> Please send me your config and the steps you did to enable function
> profiling. This is x86 correct? Other archs are already known to be
> broken and I'm working on fixing them now.

.config attached. It's actually an ARM platform, I can help out with
testing anything you need.

cheers

-- 
balbi

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