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Subject[PATCH v2 RESEND] arm: add cpu_idle tracepoints to arch_cpu_idle
Date
Currently, if cpuidle is disabled or not supported, powertop reports
zero wakeups and zero events. This is due to the cpu_idle tracepoints
are missing.

This patch is to make cpu_idle tracepoints always available even if
cpuidle is disabled or not supported.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
Since v1:
- ignore arm_pm_idle.

arch/arm/kernel/process.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 7a7c4ce..83d2dc5 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -28,6 +28,7 @@
#include <linux/random.h>
#include <linux/hw_breakpoint.h>
#include <linux/leds.h>
+#include <trace/events/power.h>

#include <asm/processor.h>
#include <asm/thread_notify.h>
@@ -66,11 +67,15 @@ void (*arm_pm_idle)(void);

void arch_cpu_idle(void)
{
- if (arm_pm_idle)
+ if (arm_pm_idle) {
arm_pm_idle();
- else
+ local_irq_enable();
+ } else {
+ trace_cpu_idle_rcuidle(1, smp_processor_id());
cpu_do_idle();
- local_irq_enable();
+ local_irq_enable();
+ trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
+ }
}

void arch_cpu_idle_prepare(void)
--
2.6.2


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