[PATCH] instrument softirq raising

This will allow the measuring of softirq latencies, and will make it easier to
follow critical paths from irq arrival to process wakeup.

Signed-off-by: Pierre-Marc Fournier <[email protected]>
---
 kernel/softirq.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index b1fc694..07344c9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -325,6 +325,8 @@ void irq_exit(void)
  */
 inline fastcall void raise_softirq_irqoff(unsigned int nr)
 {
+	trace_mark(kernel_softirq_raise, "softirq %u", nr);
+
 	__raise_softirq_irqoff(nr);
 
 	/*
-- 
1.5.3.4