linux-kernel - Re: [PATCHv3 5/5] cpuidle: coupled: add trace events

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Date:	Thu, 03 May 2012 17:00:27 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-pm@...ts.linux-foundation.org, Kevin Hilman <khilman@...com>,
	Len Brown <len.brown@...el.com>,
	Trinabh Gupta <g.trinabh@...il.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCHv3 5/5] cpuidle: coupled: add trace events

On Mon, 2012-04-30 at 13:09 -0700, Colin Cross wrote:

> diff --git a/include/trace/events/cpuidle.h b/include/trace/events/cpuidle.h
> new file mode 100644
> index 0000000..9b2cbbb
> --- /dev/null
> +++ b/include/trace/events/cpuidle.h
> @@ -0,0 +1,243 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM cpuidle
> +
> +#if !defined(_TRACE_CPUIDLE_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_CPUIDLE_H
> +
> +#include <linux/atomic.h>
> +#include <linux/tracepoint.h>
> +
> +extern atomic_t cpuidle_trace_seq;
> +
> +TRACE_EVENT(coupled_enter,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_exit,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_spin,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_unspin,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_safe_enter,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_safe_exit,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_idle_enter,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_idle_exit,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_abort,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_detected_abort,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_poke,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);
> +
> +TRACE_EVENT(coupled_poked,
> +
> +	TP_PROTO(unsigned int cpu),
> +
> +	TP_ARGS(cpu),
> +
> +	TP_STRUCT__entry(
> +		__field(unsigned int, cpu)
> +		__field(unsigned int, seq)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->cpu = cpu;
> +		__entry->seq = atomic_inc_return(&cpuidle_trace_seq);
> +	),
> +
> +	TP_printk("%u %u", __entry->seq, __entry->cpu)
> +);

Egad! Please use DECLARE_EVENT_CLASS() and DEFINE_EVENT() when adding
events that are basically the same. Every TRACE_EVENT() can bloat the
kernel by 5k, using the DEFINE_EVENT()s keeps each event around just a
few hundred bytes.

See include/trace/events/ext4.h for examples.

-- Steve


> +
> +#endif /* if !defined(_TRACE_CPUIDLE_H) || defined(TRACE_HEADER_MULTI_READ) */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>


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