X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=blobdiff_plain;f=kernel%2Fsched_fair.c;h=98e103988aad47d1e039cfa47349980b12a848f5;hp=8a39fa3e3c6c7bafe368bc2e27c607801e8afb87;hb=b919b8766d31d766d4b662e673ecdae76dbba933;hpb=abe8809c14f05430f9f8cb13bd70b2ec3195e84b

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8a39fa3e3c6c..98e103988aad 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1527,6 +1527,8 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq)
 	cfs_rq->throttled_timestamp = rq->clock;
 	raw_spin_lock(&cfs_b->lock);
 	list_add_tail_rcu(&cfs_rq->throttled_list, &cfs_b->throttled_cfs_rq);
+	if (!cfs_b->timer_active)
+		__start_cfs_bandwidth(cfs_b);
 	raw_spin_unlock(&cfs_b->lock);
 }
 
@@ -2789,6 +2791,7 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
 	 * 1) running (obviously), or
 	 * 2) cannot be migrated to this CPU due to cpus_allowed, or
 	 * 3) are cache-hot on their current CPU.
+	 * 4) p->pi_lock is held.
 	 */
 	if (!cpumask_test_cpu(this_cpu, tsk_cpus_allowed(p))) {
 		schedstat_inc(p, se.statistics.nr_failed_migrations_affine);
@@ -2801,6 +2804,14 @@ int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
 		return 0;
 	}
 
+	/*
+	 * rt -> fair class change may be in progress.  If we sneak in should
+	 * double_lock_balance() release rq->lock, and move the task, we will
+	 * cause switched_to_fair() to meet a passed but no longer valid rq.
+	 */
+	if (raw_spin_is_locked(&p->pi_lock))
+		return 0;
+
 	/*
 	 * Aggressive migration if:
 	 * 1) task is cache cold, or
@@ -4735,7 +4746,7 @@ static void nohz_idle_balance(int this_cpu, enum cpu_idle_type idle)
 
 		raw_spin_lock_irq(&this_rq->lock);
 		update_rq_clock(this_rq);
-		update_cpu_load(this_rq);
+		update_idle_cpu_load(this_rq);
 		raw_spin_unlock_irq(&this_rq->lock);
 
 		rebalance_domains(balance_cpu, CPU_IDLE);
@@ -4846,6 +4857,9 @@ static void rq_online_fair(struct rq *rq)
 static void rq_offline_fair(struct rq *rq)
 {
 	update_sysctl();
+
+	/* Ensure any throttled groups are reachable by pick_next_task */
+	unthrottle_offline_cfs_rqs(rq);
 }
 
 #else	/* CONFIG_SMP */
@@ -4890,11 +4904,15 @@ static void task_fork_fair(struct task_struct *p)
 
 	update_rq_clock(rq);
 
-	if (unlikely(task_cpu(p) != this_cpu)) {
-		rcu_read_lock();
-		__set_task_cpu(p, this_cpu);
-		rcu_read_unlock();
-	}
+	/*
+	 * Not only the cpu but also the task_group of the parent might have
+	 * been changed after parent->se.parent,cfs_rq were copied to
+	 * child->se.parent,cfs_rq. So call __set_task_cpu() to make those
+	 * of child point to valid ones.
+	 */
+	rcu_read_lock();
+	__set_task_cpu(p, this_cpu);
+	rcu_read_unlock();
 
 	update_curr(cfs_rq);
 
@@ -4944,15 +4962,15 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 
 	/*
-	 * Ensure the task's vruntime is normalized, so that when its
+	 * Ensure the task's vruntime is normalized, so that when it's
 	 * switched back to the fair class the enqueue_entity(.flags=0) will
 	 * do the right thing.
 	 *
-	 * If it was on_rq, then the dequeue_entity(.flags=0) will already
-	 * have normalized the vruntime, if it was !on_rq, then only when
+	 * If it's on_rq, then the dequeue_entity(.flags=0) will already
+	 * have normalized the vruntime, if it's !on_rq, then only when
 	 * the task is sleeping will it still have non-normalized vruntime.
 	 */
-	if (!se->on_rq && p->state != TASK_RUNNING) {
+	if (!p->on_rq && p->state != TASK_RUNNING) {
 		/*
 		 * Fix up our vruntime so that the current sleep doesn't
 		 * cause 'unlimited' sleep bonus.
@@ -5033,7 +5051,7 @@ static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task
 	 * idle runqueue:
 	 */
 	if (rq->cfs.load.weight)
-		rr_interval = NS_TO_JIFFIES(sched_slice(&rq->cfs, se));
+		rr_interval = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se));
 
 	return rr_interval;
 }