[PATCH] improve precision of idle time detection.
Increase the precision of the idle time calculation that is exported
to user space via /sys/devices/system/cpu/cpu<x>/idle_time_us
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 1254a4d..25d21fe 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -112,6 +112,7 @@
static inline void set_vtimer(__u64 expires)
{
+ struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
__u64 timer;
asm volatile (" STPT %0\n" /* Store current cpu timer value */
@@ -121,7 +122,7 @@
S390_lowcore.last_update_timer = expires;
/* store expire time for this CPU timer */
- __get_cpu_var(virt_cpu_timer).to_expire = expires;
+ vq->to_expire = expires;
}
void vtime_start_cpu_timer(void)