From: Koki Sanagi <sanagi.koki@jp•fujitsu.com>
To: netdev@vger•kernel.org
Cc: davem@davemloft•net, kaneshige.kenji@jp•fujitsu.com,
izumi.taku@jp•fujitsu.com, laijs@cn•fujitsu.com
Subject: [RFC PATCH 1/5] irq: add tracepoint to softirq_raise
Date: Tue, 08 Jun 2010 14:27:20 +0900 [thread overview]
Message-ID: <4C0DD4B8.6080507@jp.fujitsu.com> (raw)
In-Reply-To: <4C0DD43F.9090902@jp.fujitsu.com>
This patch adds tracepoint to softirq_raise.
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@jp•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,
next prev parent reply other threads:[~2010-06-08 5:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-08 5:25 [RFC PATCH 0/5] netdev: show a process of packets Koki Sanagi
2010-06-08 5:27 ` Koki Sanagi [this message]
2010-06-08 5:28 ` [RFC PATCH 2/5] napi: convert trace_napi_poll to TRACE_EVENT Koki Sanagi
2010-06-08 5:30 ` [RFC PATCH 3/5] netdev: add tracepoints to netdev layer Koki Sanagi
2010-06-08 5:30 ` [RFC PATCH 4/5] skb: add tracepoints to freeing skb Koki Sanagi
2010-06-08 5:31 ` [RFC PATCH 5/5] perf:add a script shows a process of packet Koki Sanagi
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