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Subject: Re: [PATCH 4/6] trace: Add tracepoints to reschedule interrupt
 handler
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Vaibhav Nagarnaik <vnagarnaik@google.com>,
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Date: Fri, 15 Jul 2011 10:48:02 +0200
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On Fri, 2011-07-15 at 00:02 +0200, Frederic Weisbecker wrote:
> > This is a part of overall effort to trace all the interrupts happening
> > in a system to figure out what time is spent in kernel space versus user
> > space. 

How about you enable CONFIG_IRQ_TIME_ACCOUNTING and get all that?