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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-31 15:11:40 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-31 15:11:47 +0100
commit6f43092441bda528dd38f2dc6c1e2522c5079fb7 (patch)
treee8bba1cf80b19be3e3658b9351b32469ba8c6bac /arch/s390/kernel/vtime.c
parentaa5e97ce4bbc9d5daeec16b1d15bb3f6b7b4f4d4 (diff)
downloadop-kernel-dev-6f43092441bda528dd38f2dc6c1e2522c5079fb7.zip
op-kernel-dev-6f43092441bda528dd38f2dc6c1e2522c5079fb7.tar.gz
[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>
Diffstat (limited to 'arch/s390/kernel/vtime.c')
-rw-r--r--arch/s390/kernel/vtime.c3
1 files changed, 2 insertions, 1 deletions
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 @@ EXPORT_SYMBOL_GPL(account_system_vtime);
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 @@ static inline void set_vtimer(__u64 expires)
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)
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