From 83e03321026504ee3ec69bf0a4790b82206f7a07 Mon Sep 17 00:00:00 2001
From: Antti P Miettinen <amiettinen@nvidia.com>
Date: Wed, 28 Mar 2012 20:42:55 +0300
Subject: tracing: Add tracepoints for hotplug

Simple trace points for measuring hotplug up/down times.

Bug 960310

Change-Id: I1927aae6edb74cba7ca3e9522d138407b48325dc
Signed-off-by: Antti P Miettinen <amiettinen@nvidia.com>
Reviewed-on: http://git-master/r/92920
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Satya Popuri <spopuri@nvidia.com>
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Reviewed-by: Juha Tukkinen <jtukkinen@nvidia.com>
---
 kernel/cpu.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'kernel/cpu.c')

diff --git a/kernel/cpu.c b/kernel/cpu.c
index eae3d9b39574..f9bb3d498fb4 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -16,6 +16,7 @@
 #include <linux/mutex.h>
 #include <linux/gfp.h>
 #include <linux/suspend.h>
+#include <trace/events/power.h>
 
 #ifdef CONFIG_SMP
 /* Serializes the updates to cpu_online_mask, cpu_present_mask */
@@ -274,6 +275,8 @@ int __ref cpu_down(unsigned int cpu)
 {
 	int err;
 
+	trace_cpu_hotplug(cpu, POWER_CPU_DOWN_START);
+
 	cpu_maps_update_begin();
 
 	if (cpu_hotplug_disabled) {
@@ -285,6 +288,7 @@ int __ref cpu_down(unsigned int cpu)
 
 out:
 	cpu_maps_update_done();
+	trace_cpu_hotplug(cpu, POWER_CPU_DOWN_DONE);
 	return err;
 }
 EXPORT_SYMBOL(cpu_down);
@@ -335,6 +339,8 @@ int __cpuinit cpu_up(unsigned int cpu)
 	pg_data_t	*pgdat;
 #endif
 
+	trace_cpu_hotplug(cpu, POWER_CPU_UP_START);
+
 	if (!cpu_possible(cpu)) {
 		printk(KERN_ERR "can't online cpu %d because it is not "
 			"configured as may-hotadd at boot time\n", cpu);
@@ -378,6 +384,7 @@ int __cpuinit cpu_up(unsigned int cpu)
 
 out:
 	cpu_maps_update_done();
+	trace_cpu_hotplug(cpu, POWER_CPU_UP_DONE);
 	return err;
 }
 
-- 
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