Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: hrtick_enabled() should use cpu_active()
  sched, x86: clean up hrtick implementation
  sched: fix build error, provide partition_sched_domains() unconditionally
  sched: fix warning in inc_rt_tasks() to not declare variable 'rq' if it's not needed
  cpu hotplug: Make cpu_active_map synchronization dependency clear
  cpu hotplug, sched: Introduce cpu_active_map and redo sched domain managment (take 2)
  sched: rework of "prioritize non-migratable tasks over migratable ones"
  sched: reduce stack size in isolated_cpu_setup()
  Revert parts of "ftrace: do not trace scheduler functions"

Fixed up conflicts in include/asm-x86/thread_info.h (due to the
TIF_SINGLESTEP unification vs TIF_HRTICK_RESCHED removal) and
kernel/sched_fair.c (due to cpu_active_map vs for_each_cpu_mask_nr()
introduction).

1 files changed, 49 insertions, 28 deletions

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 7c9614728c59..f85a76363eee 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -505,7 +505,9 @@ void inc_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
         rt_rq->rt_nr_running++;
 #if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
         if (rt_se_prio(rt_se) < rt_rq->highest_prio) {
+#ifdef CONFIG_SMP
                 struct rq *rq = rq_of_rt_rq(rt_rq);
+#endif
 
                 rt_rq->highest_prio = rt_se_prio(rt_se);
 #ifdef CONFIG_SMP
@@ -599,11 +601,7 @@ static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
         if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
                 return;
 
-        if (rt_se->nr_cpus_allowed == 1)
-                list_add(&rt_se->run_list, queue);
-        else
-                list_add_tail(&rt_se->run_list, queue);
-
+        list_add_tail(&rt_se->run_list, queue);
         __set_bit(rt_se_prio(rt_se), array->bitmap);
 
         inc_rt_tasks(rt_se, rt_rq);
@@ -688,32 +686,34 @@ static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
  * Put task to the end of the run list without the overhead of dequeue
  * followed by enqueue.
  */
-static
-void requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
+static void
+requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se, int head)
 {
-        struct rt_prio_array *array = &rt_rq->active;
-
         if (on_rt_rq(rt_se)) {
-                list_del_init(&rt_se->run_list);
-                list_add_tail(&rt_se->run_list,
-                              array->queue + rt_se_prio(rt_se));
+                struct rt_prio_array *array = &rt_rq->active;
+                struct list_head *queue = array->queue + rt_se_prio(rt_se);
+
+                if (head)
+                        list_move(&rt_se->run_list, queue);
+                else
+                        list_move_tail(&rt_se->run_list, queue);
         }
 }
 
-static void requeue_task_rt(struct rq *rq, struct task_struct *p)
+static void requeue_task_rt(struct rq *rq, struct task_struct *p, int head)
 {
         struct sched_rt_entity *rt_se = &p->rt;
         struct rt_rq *rt_rq;
 
         for_each_sched_rt_entity(rt_se) {
                 rt_rq = rt_rq_of_se(rt_se);
-                requeue_rt_entity(rt_rq, rt_se);
+                requeue_rt_entity(rt_rq, rt_se, head);
         }
 }
 
 static void yield_task_rt(struct rq *rq)
 {
-        requeue_task_rt(rq, rq->curr);
+        requeue_task_rt(rq, rq->curr, 0);
 }
 
 #ifdef CONFIG_SMP
@@ -753,6 +753,30 @@ static int select_task_rq_rt(struct task_struct *p, int sync)
          */
         return task_cpu(p);
 }
+
+static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
+{
+        cpumask_t mask;
+
+        if (rq->curr->rt.nr_cpus_allowed == 1)
+                return;
+
+        if (p->rt.nr_cpus_allowed != 1
+            && cpupri_find(&rq->rd->cpupri, p, &mask))
+                return;
+
+        if (!cpupri_find(&rq->rd->cpupri, rq->curr, &mask))
+                return;
+
+        /*
+         * There appears to be other cpus that can accept
+         * current and none to run 'p', so lets reschedule
+         * to try and push current away:
+         */
+        requeue_task_rt(rq, p, 1);
+        resched_task(rq->curr);
+}
+
 #endif /* CONFIG_SMP */
 
 /*
@@ -778,18 +802,8 @@ static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p)
          * to move current somewhere else, making room for our non-migratable
          * task.
          */
-        if((p->prio == rq->curr->prio)
-           && p->rt.nr_cpus_allowed == 1
-           && rq->curr->rt.nr_cpus_allowed != 1) {
-                cpumask_t mask;
-
-                if (cpupri_find(&rq->rd->cpupri, rq->curr, &mask))
-                        /*
-                         * There appears to be other cpus that can accept
-                         * current, so lets reschedule to try and push it away
-                         */
-                        resched_task(rq->curr);
-        }
+        if (p->prio == rq->curr->prio && !need_resched())
+                check_preempt_equal_prio(rq, p);
 #endif
 }
 
@@ -922,6 +936,13 @@ static int find_lowest_rq(struct task_struct *task)
                 return -1; /* No targets found */
 
         /*
+         * Only consider CPUs that are usable for migration.
+         * I guess we might want to change cpupri_find() to ignore those
+         * in the first place.
+         */
+        cpus_and(*lowest_mask, *lowest_mask, cpu_active_map);
+
+        /*
          * At this point we have built a mask of cpus representing the
          * lowest priority tasks in the system.  Now we want to elect
          * the best one based on our affinity and topology.
@@ -1415,7 +1436,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued)
          * on the queue:
          */
         if (p->rt.run_list.prev != p->rt.run_list.next) {
-                requeue_task_rt(rq, p);
+                requeue_task_rt(rq, p, 0);
                 set_tsk_need_resched(p);
         }
 }