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Subject: Re: [PATCH v2 3/6] trace: Add tracepoints to IRQ work run handler
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
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Date: Thu, 28 Jul 2011 14:12:51 +0200
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On Wed, 2011-07-27 at 11:57 -0700, Vaibhav Nagarnaik wrote:
> @@ -122,6 +123,7 @@ void irq_work_run(void)
>  {
>         struct irq_work *list;
>  
> +       trace_irq_work_run_entry(0);
>         if (this_cpu_read(irq_work_list) == NULL)
>                 return;
>  
> @@ -149,6 +151,7 @@ void irq_work_run(void)
>                               next_flags(NULL, IRQ_WORK_BUSY),
>                               NULL);
>         }
> +       trace_irq_work_run_exit(0);
>  }
>  EXPORT_SYMBOL_GPL(irq_work_run); 

So what happens when we call irq_work_run() from the timer interrupt?