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irq: Add tracepoint to softirq_raise 

Add a tracepoint for tracing when softirq action is raised.

This and the existing tracepoints complete softirq's tracepoints:
softirq_raise, softirq_entry and softirq_exit.

And when this tracepoint is used in combination with
the softirq_entry tracepoint we can determine
the softirq raise latency.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: David Miller <davem@davemloft.net>
Cc: Kaneshige Kenji <kaneshige.kenji@jp.fujitsu.com>
Cc: Izumo Taku <izumi.taku@jp.fujitsu.com>
Cc: Kosaki Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Scott Mcmillan <scott.a.mcmillan@intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
LKML-Reference: <4C724298.4050509@jp.fujitsu.com>
[ factorize softirq events with DECLARE_EVENT_CLASS ]
Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Lai Jiangshan 2010-08-23 18:42:48 +09:00 committed by Frederic Weisbecker
parent f6195aa09e
commit 2bf2160d88
2 changed files with 31 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/interrupt.h
View File

@ -18,6 +18,7 @@
#include <asm/atomic.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <trace/events/irq.h>
/*
* These correspond to the IORESOURCE_IRQ_* defines in
@ -407,7 +408,12 @@ asmlinkage void do_softirq(void);
asmlinkage void __do_softirq(void);
extern void open_softirq(int nr, void (*action)(struct softirq_action *));
extern void softirq_init(void);
#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
static inline void __raise_softirq_irqoff(unsigned int nr)
{
trace_softirq_raise((struct softirq_action *)(unsigned long)nr, NULL);
or_softirq_pending(1UL << nr);
}
extern void raise_softirq_irqoff(unsigned int nr);
extern void raise_softirq(unsigned int nr);
extern void wakeup_softirqd(void);

26
include/trace/events/irq.h
View File

@ -5,7 +5,9 @@
#define _TRACE_IRQ_H
#include <linux/tracepoint.h>
#include <linux/interrupt.h>
struct irqaction;
struct softirq_action;
#define softirq_name(sirq) { sirq##_SOFTIRQ, #sirq }
#define show_softirq_name(val) \
@ -93,7 +95,10 @@ DECLARE_EVENT_CLASS(softirq,
),
TP_fast_assign(
__entry->vec = (int)(h - vec);
if (vec)
__entry->vec = (int)(h - vec);
else
__entry->vec = (int)(long)h;
),
TP_printk("vec=%d [action=%s]", __entry->vec,
@ -136,6 +141,23 @@ DEFINE_EVENT(softirq, softirq_exit,
TP_ARGS(h, vec)
);
/**
* softirq_raise - called immediately when a softirq is raised
* @h: pointer to struct softirq_action
* @vec: pointer to first struct softirq_action in softirq_vec array
*
* The @h parameter contains a pointer to the softirq vector number which is
* raised. @vec is NULL and it means @h includes vector number not
* softirq_action. When used in combination with the softirq_entry tracepoint
* we can determine the softirq raise latency.
*/
DEFINE_EVENT(softirq, softirq_raise,
TP_PROTO(struct softirq_action *h, struct softirq_action *vec),
TP_ARGS(h, vec)
);
#endif /* _TRACE_IRQ_H */
/* This part must be outside protection */