Messages in this thread Patch in this message | | | Date | Thu, 05 Nov 2009 15:54:55 +0800 | From | Lai Jiangshan <> | Subject | [PATCH] softirq,tracing: enable to trace softirq raise latency |
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Add a tracepoint for tracing when softirq action is raised.
It and the existed 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> --- diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index 75f3f00..b368d5d 100644 --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -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 @@ -372,7 +373,13 @@ 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(nr); + 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); diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h index dcfcd44..799af09 100644 --- a/include/trace/events/irq.h +++ b/include/trace/events/irq.h @@ -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) \ @@ -83,6 +85,32 @@ TRACE_EVENT(irq_handler_exit, ); /** + * softirq_raise - called immediately when a softirq is raised + * @nr: softirq vector number + * + * Tracepoint for tracing when softirq action is raised. + * Also, when used in combination with the softirq_entry tracepoint + * we can determine the softirq raise latency. + */ +TRACE_EVENT(softirq_raise, + + TP_PROTO(unsigned int nr), + + TP_ARGS(nr), + + TP_STRUCT__entry( + __field( unsigned int, vec ) + ), + + TP_fast_assign( + __entry->vec = nr; + ), + + TP_printk("vec=%d [action=%s]", __entry->vec, + show_softirq_name(__entry->vec)) +); + +/** * softirq_entry - called immediately before the softirq handler * @h: pointer to struct softirq_action * @vec: pointer to first struct softirq_action in softirq_vec array @@ -100,11 +128,11 @@ TRACE_EVENT(softirq_entry, TP_ARGS(h, vec), TP_STRUCT__entry( - __field( int, vec ) + __field( unsigned int, vec ) ), TP_fast_assign( - __entry->vec = (int)(h - vec); + __entry->vec = (unsigned int)(h - vec); ), TP_printk("vec=%d [action=%s]", __entry->vec, @@ -129,11 +157,11 @@ TRACE_EVENT(softirq_exit, TP_ARGS(h, vec), TP_STRUCT__entry( - __field( int, vec ) + __field( unsigned int, vec ) ), TP_fast_assign( - __entry->vec = (int)(h - vec); + __entry->vec = (unsigned int)(h - vec); ), TP_printk("vec=%d [action=%s]", __entry->vec,
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