linux-kernel - Re: [PATCH] arm: ftrace: Adds support for ftrace operations

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Message-ID: <20141127095825.37f57197@gandalf.local.home>
Date:	Thu, 27 Nov 2014 09:58:25 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	nsekhar@...com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...hat.com, Christoffer Dall <christoffer.dall@...aro.org>,
	jslaby@...e.cz,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: ftrace: Adds support for ftrace operations

On Thu, 27 Nov 2014 11:23:45 +0100
Jean-Jacques Hiblot <jjhiblot@...phandler.com> wrote:

> 2014-11-26 0:20 GMT+01:00 Steven Rostedt <rostedt@...dmis.org>:
> > On Mon, 24 Nov 2014 10:59:24 +0100
> > Jean-Jacques Hiblot <jjhiblot@...phandler.com> wrote:
> >
> >> Hi Steve,
> >> did you get a chance of running your tests suite on real hardware with
> >> this patch? I'd be really interested in the results.
> >
> > Yes I finally got it working on my beaglebone white. It passed all the
> > tests that passed without it. Although I'm not sure this patch itself
> > was tested as I didn't have kprobes which might use it.
> >
> Thanks for testing it. At least it doesn't cause regression.
> What do you mean by not having krpobes which might use it ? Are you
> thinking of the kprobe optimization based on ftrace ?
> 

Yep. My tests use that. But as ARM doesn't have an mfentry where
functions probed by kprobes at the start are optimized with ftrace, my
tests wont test it.

I also didn't have kprobes enabled on this board. Is it fully supported
in ARM, and does kprobes use it there too?

-- Steve
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