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Date: Tue, 15 Jan 2013 20:25:28 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Seiji Aguchi <seiji.aguchi@....com>
Cc: "x86@...nel.org" <x86@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"H. Peter Anvin (hpa@...or.com)" <hpa@...or.com>,
"Thomas Gleixner (tglx@...utronix.de)" <tglx@...utronix.de>,
"'mingo@...e.hu' (mingo@...e.hu)" <mingo@...e.hu>,
"Borislav Petkov (bp@...en8.de)" <bp@...en8.de>,
Satoru Moriya <satoru.moriya@....com>,
"dle-develop@...ts.sourceforge.net"
<dle-develop@...ts.sourceforge.net>,
"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>
Subject: Re: [RFC][PATCH v7 1/2] trace,x86: add x86 irq vector tracepoints
On Thu, 2013-01-10 at 17:33 +0000, Seiji Aguchi wrote:
> diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
> new file mode 100644
> index 0000000..9bcb27b
> --- /dev/null
> +++ b/arch/x86/include/asm/trace/irq_vectors.h
> @@ -0,0 +1,154 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM irq_vectors
> +
> +#if !defined(_TRACE_IRQ_VECTORS_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_IRQ_VECTORS_H
> +
> +#include <linux/tracepoint.h>
> +
> +extern void trace_irq_vector_regfunc(void);
> +extern void trace_irq_vector_unregfunc(void);
> +
> +#define DECLARE_IRQ_VECTOR_EVENT(name) \
> +TRACE_EVENT_FN(name, \
> + TP_PROTO(int vector), \
> + \
> + TP_ARGS(vector), \
> + \
> + TP_STRUCT__entry( \
> + __field( int, vector ) \
> + ), \
> + \
> + TP_fast_assign( \
> + __entry->vector = vector; \
> + ), \
> + \
> + TP_printk("vector=%d", __entry->vector), \
> + trace_irq_vector_regfunc, trace_irq_vector_unregfunc \
> +);
> +
> +/*
> + * local_timer_entry - called before entering a local timer interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(local_timer_entry)
This is a great big waste of space. Add the below patch to your series
and then just do:
DECLARE_EVENT_CLASS(x86_irq_vector,
TP_PROTO(int vector),
TP_ARGS(vector),
TP_STRUCT__entry(
__field( int, vector )
),
TP_fast_assign(
__entry->vector = vector;
),
TP_printk("vector=%d", __entry->vector)
);
#define DEFINE_IRQ_VECTOR_EVENT(name) \
DEFINE_EVENT_FN(name, \
TP_PROTO(int vector), \
TP_ARGS(vector), \
trace_irq_vector_regfunc, \
trace_irq_vector_unregfunc);
And keep the rest the same.
> +
> +/*
> + * local_timer_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(local_timer_exit)
> +
> +/*
> + * reschedule_entry - called before entering a reschedule vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(reschedule_entry)
> +
> +/*
> + * reschedule_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(reschedule_exit)
> +
> +/*
> + * spurious_apic_entry - called before entering a spurious apic vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(spurious_apic_entry)
> +
> +/*
> + * spurious_apic_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(spurious_apic_exit)
> +
> +/*
> + * error_apic_entry - called before entering an error apic vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(error_apic_entry)
> +
> +/*
> + * error_apic_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(error_apic_exit)
> +
> +/*
> + * x86_platform_ipi_entry - called before entering a x86 platform ipi interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(x86_platform_ipi_entry)
> +
> +/*
> + * x86_platform_ipi_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(x86_platform_ipi_exit)
> +
> +/*
> + * irq_work_entry - called before entering a irq work interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(irq_work_entry)
> +
> +/*
> + * irq_work_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(irq_work_exit)
> +
> +/*
> + * call_function_entry - called before entering a call function interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(call_function_entry)
> +
> +/*
> + * call_function_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(call_function_exit)
> +
> +/*
> + * call_function_single_entry - called before entering a call function
> + * single interrupt vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(call_function_single_entry)
> +
> +/*
> + * call_function_single_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(call_function_single_exit)
> +
> +/*
> + * threshold_apic_entry - called before entering a threshold apic interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(threshold_apic_entry)
> +
> +/*
> + * threshold_apic_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(threshold_apic_exit)
> +
> +/*
> + * thermal_apic_entry - called before entering a thermal apic interrupt
> + * vector handler
> + */
> +DECLARE_IRQ_VECTOR_EVENT(thermal_apic_entry)
> +
> +/*
> + * thrmal_apic_exit - called immediately after the interrupt vector
> + * handler returns
> + */
> +DECLARE_IRQ_VECTOR_EVENT(thermal_apic_exit)
> +
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_PATH ../../arch/x86/include/asm/trace
> +#define TRACE_INCLUDE_FILE irq_vectors
> +#endif /* _TRACE_IRQ_VECTORS_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> +
---
tracing: Add DEFINE_EVENT_FN() macro
Each TRACE_EVENT() adds several helper functions. If two or more trace
events share the same structure and print format, they can also share
most of these helper functions and save a lot of space from duplicate
code. This is why the DECLARE_EVENT_CLASS() and DEFINE_EVENT() were
created.
Some events require a trigger to be called at registering and
unregistering of the event and to do so they use TRACE_EVENT_FN().
If multiple events require a trigger, they currently have no choice but
to use TRACE_EVENT_FN() as there's no DEFINE_EVENT_FN() available. This
unfortunately causes a lot of wasted duplicate code created.
By adding a DEFINE_EVENT_FN(), these events can still use a
DECLARE_EVENT_CLASS() and then define their own triggers.
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 2f322c3..9bf59e5 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -378,6 +378,8 @@ static inline void tracepoint_synchronize_unregister(void)
#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_EVENT(template, name, proto, args) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
+#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\
+ DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#define DEFINE_EVENT_CONDITION(template, name, proto, \
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index 1905ca8..02e1003 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -44,6 +44,10 @@
#define DEFINE_EVENT(template, name, proto, args) \
DEFINE_TRACE(name)
+#undef DEFINE_EVENT_FN
+#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
+ DEFINE_TRACE_FN(name, reg, unreg)
+
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_TRACE(name)
@@ -91,6 +95,7 @@
#undef TRACE_EVENT_CONDITION
#undef DECLARE_EVENT_CLASS
#undef DEFINE_EVENT
+#undef DEFINE_EVENT_FN
#undef DEFINE_EVENT_PRINT
#undef DEFINE_EVENT_CONDITION
#undef TRACE_HEADER_MULTI_READ
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 40dc5e8..7bab676 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -71,6 +71,10 @@
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) event_##name
+#undef DEFINE_EVENT_FN
+#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
+ DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
+
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
--
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