From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC 1/4] ftrace: Add events for tracing timer interrupts
Date: Wed, 08 Sep 2010 14:38:23 +0200
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Cc: Linux-Kernel Mailinglist <linux-kernel@vger.kernel.org>,
	linux-rt-users@vger.kernel.org,
	Sven-Thorsten Dietrich <sdietrich@novell.com>,
	Michael Galbraith <MGalbraith@novell.com>
To: Jan Blunck <jblunck@suse.de>
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On Wed, 2010-09-08 at 14:29 +0200, Jan Blunck wrote:
> Trace the execution of the timer interrupt. I did not find an argument that
> makes any sense so traces look like this:
> 
> <idle>-0     [000] 181019.693546: timerirq_enter: unused=1
> <idle>-0     [000] 181019.693553: timerirq_exit: unused=1

So what's wrong with the normal IRQ enter/exit tracepoints?