kconfig: fix default value for choice input

[pandora-kernel.git] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index a9ecac3..dd153d6 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -667,9 +667,13 @@ static int effective_prio(task_t *p)
 /*
  * __activate_task - move a task to the runqueue.
  */
-static inline void __activate_task(task_t *p, runqueue_t *rq)
+static void __activate_task(task_t *p, runqueue_t *rq)
 {
-       enqueue_task(p, rq->active);
+       prio_array_t *target = rq->active;
+
+       if (batch_task(p))
+               target = rq->expired;
+       enqueue_task(p, target);
        rq->nr_running++;
 }
 
@@ -688,7 +692,7 @@ static int recalc_task_prio(task_t *p, unsigned long long now)
        unsigned long long __sleep_time = now - p->timestamp;
        unsigned long sleep_time;
 
-       if (unlikely(p->policy == SCHED_BATCH))
+       if (batch_task(p))
                sleep_time = 0;
        else {
                if (__sleep_time > NS_MAX_SLEEP_AVG)
@@ -700,21 +704,25 @@ static int recalc_task_prio(task_t *p, unsigned long long now)
        if (likely(sleep_time > 0)) {
                /*
                 * User tasks that sleep a long time are categorised as
-                * idle and will get just interactive status to stay active &
-                * prevent them suddenly becoming cpu hogs and starving
-                * other processes.
+                * idle. They will only have their sleep_avg increased to a
+                * level that makes them just interactive priority to stay
+                * active yet prevent them suddenly becoming cpu hogs and
+                * starving other processes.
                 */
-               if (p->mm && p->activated != -1 &&
-                       sleep_time > INTERACTIVE_SLEEP(p)) {
-                               p->sleep_avg = JIFFIES_TO_NS(MAX_SLEEP_AVG -
-                                               DEF_TIMESLICE);
+               if (p->mm && sleep_time > INTERACTIVE_SLEEP(p)) {
+                               unsigned long ceiling;
+
+                               ceiling = JIFFIES_TO_NS(MAX_SLEEP_AVG -
+                                       DEF_TIMESLICE);
+                               if (p->sleep_avg < ceiling)
+                                       p->sleep_avg = ceiling;
                } else {
                        /*
                         * Tasks waking from uninterruptible sleep are
                         * limited in their sleep_avg rise as they
                         * are likely to be waiting on I/O
                         */
-                       if (p->activated == -1 && p->mm) {
+                       if (p->sleep_type == SLEEP_NONINTERACTIVE && p->mm) {
                                if (p->sleep_avg >= INTERACTIVE_SLEEP(p))
                                        sleep_time = 0;
                                else if (p->sleep_avg + sleep_time >=
@@ -769,7 +777,7 @@ static void activate_task(task_t *p, runqueue_t *rq, int local)
         * This checks to make sure it's not an uninterruptible task
         * that is now waking up.
         */
-       if (!p->activated) {
+       if (p->sleep_type == SLEEP_NORMAL) {
                /*
                 * Tasks which were woken up by interrupts (ie. hw events)
                 * are most likely of interactive nature. So we give them
@@ -778,13 +786,13 @@ static void activate_task(task_t *p, runqueue_t *rq, int local)
                 * on a CPU, first time around:
                 */
                if (in_interrupt())
-                       p->activated = 2;
+                       p->sleep_type = SLEEP_INTERRUPTED;
                else {
                        /*
                         * Normal first-time wakeups get a credit too for
                         * on-runqueue time, but it will be weighted down:
                         */
-                       p->activated = 1;
+                       p->sleep_type = SLEEP_INTERACTIVE;
                }
        }
        p->timestamp = now;
@@ -1272,19 +1280,19 @@ out_activate:
                 * Tasks on involuntary sleep don't earn
                 * sleep_avg beyond just interactive state.
                 */
-               p->activated = -1;
-       }
+               p->sleep_type = SLEEP_NONINTERACTIVE;
+       } else
 
        /*
         * Tasks that have marked their sleep as noninteractive get
-        * woken up without updating their sleep average. (i.e. their
-        * sleep is handled in a priority-neutral manner, no priority
-        * boost and no penalty.)
+        * woken up with their sleep average not weighted in an
+        * interactive way.
         */
-       if (old_state & TASK_NONINTERACTIVE)
-               __activate_task(p, rq);
-       else
-               activate_task(p, rq, cpu == this_cpu);
+               if (old_state & TASK_NONINTERACTIVE)
+                       p->sleep_type = SLEEP_NONINTERACTIVE;
+
+
+       activate_task(p, rq, cpu == this_cpu);
        /*
         * Sync wakeups (i.e. those types of wakeups where the waker
         * has indicated that it will leave the CPU in short order)
@@ -1658,6 +1666,21 @@ unsigned long nr_iowait(void)
        return sum;
 }
 
+unsigned long nr_active(void)
+{
+       unsigned long i, running = 0, uninterruptible = 0;
+
+       for_each_online_cpu(i) {
+               running += cpu_rq(i)->nr_running;
+               uninterruptible += cpu_rq(i)->nr_uninterruptible;
+       }
+
+       if (unlikely((long)uninterruptible < 0))
+               uninterruptible = 0;
+
+       return running + uninterruptible;
+}
+
 #ifdef CONFIG_SMP
 
 /*
@@ -2860,6 +2883,12 @@ EXPORT_SYMBOL(sub_preempt_count);
 
 #endif
 
+static inline int interactive_sleep(enum sleep_type sleep_type)
+{
+       return (sleep_type == SLEEP_INTERACTIVE ||
+               sleep_type == SLEEP_INTERRUPTED);
+}
+
 /*
  * schedule() is the main scheduler function.
  */
@@ -2983,12 +3012,12 @@ go_idle:
        queue = array->queue + idx;
        next = list_entry(queue->next, task_t, run_list);
 
-       if (!rt_task(next) && next->activated > 0) {
+       if (!rt_task(next) && interactive_sleep(next->sleep_type)) {
                unsigned long long delta = now - next->timestamp;
                if (unlikely((long long)(now - next->timestamp) < 0))
                        delta = 0;
 
-               if (next->activated == 1)
+               if (next->sleep_type == SLEEP_INTERACTIVE)
                        delta = delta * (ON_RUNQUEUE_WEIGHT * 128 / 100) / 128;
 
                array = next->array;
@@ -2998,10 +3027,9 @@ go_idle:
                        dequeue_task(next, array);
                        next->prio = new_prio;
                        enqueue_task(next, array);
-               } else
-                       requeue_task(next, array);
+               }
        }
-       next->activated = 0;
+       next->sleep_type = SLEEP_NORMAL;
 switch_tasks:
        if (next == rq->idle)
                schedstat_inc(rq, sched_goidle);