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Subject[PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler
Date
The x86 timer interrupt handler is the only handler not traced in the
irq/irq_handler_{entry|exit} trace events.
Add tracepoints to the interrupt handler to trace it.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
---
arch/x86/kernel/time.c | 15 +++++++++------
1 files changed, 9 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index 5a64d05..74d2280 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -51,6 +51,13 @@ unsigned long profile_pc(struct pt_regs *regs)
}
EXPORT_SYMBOL(profile_pc);

+static irqreturn_t timer_interrupt(int irq, void *dev_id);
+static struct irqaction irq0 = {
+ .handler = timer_interrupt,
+ .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
+ .name = "timer"
+};
+
/*
* Default timer interrupt handler for PIT/HPET
*/
@@ -59,7 +66,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
/* Keep nmi watchdog up to date */
inc_irq_stat(irq0_irqs);

+ trace_irq_handler_entry(irq, &irq0);
global_clock_event->event_handler(global_clock_event);
+ trace_irq_handler_exit(irq, &irq0, 1);

/* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
if (MCA_bus)
@@ -68,12 +77,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

-static struct irqaction irq0 = {
- .handler = timer_interrupt,
- .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
- .name = "timer"
-};
-
void __init setup_default_timer_irq(void)
{
setup_irq(0, &irq0);
--
1.7.3.1


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