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Date: Fri, 25 Jun 2010 09:57:50 +0900 From: Koki Sanagi <sanagi.koki@...fujitsu.com> To: linux-kernel@...r.kernel.org CC: kaneshige.kenji@...fujitsu.com, izumi.taku@...fujitsu.com Subject: [RFC PATCH v2 1/5] irq: add tracepoint to softirq_raise This patch adds a tracepoint to raising of softirq. This is useful if you want to detect which hard interrupt raise softirq and lets you know a time between raising softirq and performing softirq. Combinating with other tracepoint, it lets us know a process of packets (See patch 0/5). <idle>-0 [001] 241229.957184: softirq_raise: vec=3 [action=NET_RX] <idle>-0 [000] 241229.993399: softirq_raise: vec=1 [action=TIMER] <idle>-0 [000] 241229.993400: softirq_raise: vec=9 [action=RCU] This is a same patch Lai Jiangshan submitted. http://marc.info/?l=linux-kernel&m=126026122728732&w=2 Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com> --- include/linux/interrupt.h | 8 +++++++- include/trace/events/irq.h | 34 +++++++++++++++++++++++++++++++--- 2 files changed, 38 insertions(+), 4 deletions(-) diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h index c233113..1cb5726 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 @@ -402,7 +403,12 @@ 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(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 0e4cfb6..7cb7435 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) \ @@ -82,6 +84,32 @@ TRACE_EVENT(irq_handler_exit, __entry->irq, __entry->ret ? "handled" : "unhandled") ); +/** + * 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)) +); + DECLARE_EVENT_CLASS(softirq, TP_PROTO(struct softirq_action *h, struct softirq_action *vec), @@ -89,11 +117,11 @@ DECLARE_EVENT_CLASS(softirq, 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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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