aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/vtime.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/s390/kernel/vtime.c')
-rw-r--r--arch/s390/kernel/vtime.c83
1 files changed, 51 insertions, 32 deletions
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index ecf0304e61c..c87f59bd824 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -134,6 +134,8 @@ void vtime_start_cpu(void)
/* Account time spent with enabled wait psw loaded as idle time. */
idle_time = S390_lowcore.int_clock - idle->idle_enter;
account_idle_time(idle_time);
+ S390_lowcore.steal_timer +=
+ idle->idle_enter - S390_lowcore.last_update_clock;
S390_lowcore.last_update_clock = S390_lowcore.int_clock;
/* Account system time spent going idle. */
@@ -238,6 +240,22 @@ void vtime_stop_cpu(void)
}
}
+cputime64_t s390_get_idle_time(int cpu)
+{
+ struct s390_idle_data *idle;
+ unsigned long long now, idle_time, idle_enter;
+
+ idle = &per_cpu(s390_idle, cpu);
+ spin_lock(&idle->lock);
+ now = get_clock();
+ idle_time = 0;
+ idle_enter = idle->idle_enter;
+ if (idle_enter != 0ULL && idle_enter < now)
+ idle_time = now - idle_enter;
+ spin_unlock(&idle->lock);
+ return idle_time;
+}
+
/*
* Sorted add to a list. List is linear searched until first bigger
* element is found.
@@ -425,17 +443,7 @@ void add_virt_timer_periodic(void *new)
}
EXPORT_SYMBOL(add_virt_timer_periodic);
-/*
- * If we change a pending timer the function must be called on the CPU
- * where the timer is running on, e.g. by smp_call_function_single()
- *
- * The original mod_timer adds the timer if it is not pending. For
- * compatibility we do the same. The timer will be added on the current
- * CPU as a oneshot timer.
- *
- * returns whether it has modified a pending timer (1) or not (0)
- */
-int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
+int __mod_vtimer(struct vtimer_list *timer, __u64 expires, int periodic)
{
struct vtimer_queue *vq;
unsigned long flags;
@@ -444,39 +452,35 @@ int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
BUG_ON(!timer->function);
BUG_ON(!expires || expires > VTIMER_MAX_SLICE);
- /*
- * This is a common optimization triggered by the
- * networking code - if the timer is re-modified
- * to be the same thing then just return:
- */
if (timer->expires == expires && vtimer_pending(timer))
return 1;
cpu = get_cpu();
vq = &per_cpu(virt_cpu_timer, cpu);
- /* check if we run on the right CPU */
- BUG_ON(timer->cpu != cpu);
-
/* disable interrupts before test if timer is pending */
spin_lock_irqsave(&vq->lock, flags);
/* if timer isn't pending add it on the current CPU */
if (!vtimer_pending(timer)) {
spin_unlock_irqrestore(&vq->lock, flags);
- /* we do not activate an interval timer with mod_virt_timer */
- timer->interval = 0;
+
+ if (periodic)
+ timer->interval = expires;
+ else
+ timer->interval = 0;
timer->expires = expires;
timer->cpu = cpu;
internal_add_vtimer(timer);
return 0;
}
+ /* check if we run on the right CPU */
+ BUG_ON(timer->cpu != cpu);
+
list_del_init(&timer->entry);
timer->expires = expires;
-
- /* also change the interval if we have an interval timer */
- if (timer->interval)
+ if (periodic)
timer->interval = expires;
/* the timer can't expire anymore so we can release the lock */
@@ -484,9 +488,32 @@ int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
internal_add_vtimer(timer);
return 1;
}
+
+/*
+ * If we change a pending timer the function must be called on the CPU
+ * where the timer is running on.
+ *
+ * returns whether it has modified a pending timer (1) or not (0)
+ */
+int mod_virt_timer(struct vtimer_list *timer, __u64 expires)
+{
+ return __mod_vtimer(timer, expires, 0);
+}
EXPORT_SYMBOL(mod_virt_timer);
/*
+ * If we change a pending timer the function must be called on the CPU
+ * where the timer is running on.
+ *
+ * returns whether it has modified a pending timer (1) or not (0)
+ */
+int mod_virt_timer_periodic(struct vtimer_list *timer, __u64 expires)
+{
+ return __mod_vtimer(timer, expires, 1);
+}
+EXPORT_SYMBOL(mod_virt_timer_periodic);
+
+/*
* delete a virtual timer
*
* returns whether the deleted timer was pending (1) or not (0)
@@ -516,16 +543,8 @@ EXPORT_SYMBOL(del_virt_timer);
*/
void init_cpu_vtimer(void)
{
- struct thread_info *ti = current_thread_info();
struct vtimer_queue *vq;
- S390_lowcore.user_timer = ti->user_timer;
- S390_lowcore.system_timer = ti->system_timer;
-
- /* kick the virtual timer */
- asm volatile ("STCK %0" : "=m" (S390_lowcore.last_update_clock));
- asm volatile ("STPT %0" : "=m" (S390_lowcore.last_update_timer));
-
/* initialize per cpu vtimer structure */
vq = &__get_cpu_var(virt_cpu_timer);
INIT_LIST_HEAD(&vq->list);