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Message-ID: <CAMbhsRQWwp6TLVbHefV5c0fsb0W5=B_EVEdWtHcwc799dWEHGg@mail.gmail.com>
Date: Thu, 3 May 2012 14:13:27 -0700
From: Colin Cross <ccross@...roid.com>
To: Steven Rostedt <rostedt@...dmis.org>
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 Thu, May 3, 2012 at 2:00 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> 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.
Thanks, I'll take a look. There is no mention in Documentation/ or
samples/ of DECLARE_EVENT_CLASS() or DEFINE_EVENT(), nor any mention
of the cost of TRACE_EVENT().
Looking at the new power tracing code, I will also rework these events
to be more similar to the existing ones.
I suggest skipping this patch for 3.5, and I'll post an updated one for 3.6.
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