linux-kernel - Re: [PATCH 5/6] trace: Add tracepoints to call function interrupt handlers

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Date:	Fri, 15 Jul 2011 00:05:46 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH 5/6] trace: Add tracepoints to call function interrupt
 handlers

On Thu, Jul 14, 2011 at 02:38:14PM -0700, Vaibhav Nagarnaik wrote:
> Add tracepoints to call function and call function single interrupt
> handlers.
> 
> 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.
> 
> Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
> ---
>  include/trace/events/irq.h |   73 ++++++++++++++++++++++++++++++++++++++++++++
>  kernel/smp.c               |    5 +++
>  2 files changed, 78 insertions(+), 0 deletions(-)
> 
> diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
> index a2a0a49..40b19f4 100644
> --- a/include/trace/events/irq.h
> +++ b/include/trace/events/irq.h
> @@ -384,6 +384,79 @@ DEFINE_EVENT(reschedule_interrupt, reschedule_interrupt_exit,
>  	TP_ARGS(ignore)
>  );
>  
> +DECLARE_EVENT_CLASS(call_function,
> +
> +	TP_PROTO(unsigned int ignore),
> +
> +	TP_ARGS(ignore),
> +
> +	TP_STRUCT__entry(
> +		__field(	unsigned int,	ignore	)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->ignore = ignore;
> +	),
> +
> +	TP_printk("%u", __entry->ignore)
> +);
> +
> +/**
> + * call_function_entry - called immediately after entering the
> + * call function interrupt handler
> + *
> + * When used in combination with the call_function_exit tracepoint
> + * we can determine the call function interrupt handler runtime.
> + */
> +DEFINE_EVENT(call_function, call_function_entry,
> +
> +	TP_PROTO(unsigned int ignore),
> +
> +	TP_ARGS(ignore)
> +);

Looks good. But perhaps we need some disambiguation on the names, call_function is perhaps
too generic.

What about trace_irq_call_function() ? Or may be something with ipi in the name, dunno. 
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