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authorAntti P Miettinen <amiettinen@nvidia.com>2012-03-28 20:42:55 +0300
committerRohan Somvanshi <rsomvanshi@nvidia.com>2012-04-12 22:56:36 -0700
commit83e03321026504ee3ec69bf0a4790b82206f7a07 (patch)
tree17f1dbf7153a03ca46de5f1f972b1d0a5e793ccd /kernel/cpu.c
parentd340e5c6525b1332dd5cd880137b5c930d01fe68 (diff)
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>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c7
1 files changed, 7 insertions, 0 deletions
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;
}