9 files changed, 1785 insertions, 2440 deletions

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 3feaf5a74514..6b1ccc3f0205 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -197,16 +197,8 @@ static int __init ksysfs_init(void)
                         goto group_exit;
         }
 
-        /* create the /sys/kernel/uids/ directory */
-        error = uids_sysfs_init();
-        if (error)
-                goto notes_exit;
-
         return 0;
 
-notes_exit:
-        if (notes_size > 0)
-                sysfs_remove_bin_file(kernel_kobj, &notes_attr);
 group_exit:
         sysfs_remove_group(kernel_kobj, &kernel_attr_group);
 kset_exit:
diff --git a/kernel/kthread.c b/kernel/kthread.c
index fbb6222fe7e0..82ed0ea15194 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -101,7 +101,7 @@ static void create_kthread(struct kthread_create_info *create)
  *
  * Description: This helper function creates and names a kernel
  * thread.  The thread will be stopped: use wake_up_process() to start
- * it.  See also kthread_run(), kthread_create_on_cpu().
+ * it.  See also kthread_run().
  *
  * When woken, the thread will run @threadfn() with @data as its
  * argument. @threadfn() can either call do_exit() directly if it is a
diff --git a/kernel/sched.c b/kernel/sched.c
index caf54e1eef6e..6a212c97f523 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -233,7 +233,7 @@ static void destroy_rt_bandwidth(struct rt_bandwidth *rt_b)
  */
 static DEFINE_MUTEX(sched_domains_mutex);
 
-#ifdef CONFIG_GROUP_SCHED
+#ifdef CONFIG_CGROUP_SCHED
 
 #include <linux/cgroup.h>
 
@@ -243,13 +243,7 @@ static LIST_HEAD(task_groups);
 
 /* task group related information */
 struct task_group {
-#ifdef CONFIG_CGROUP_SCHED
         struct cgroup_subsys_state css;
-#endif
-
-#ifdef CONFIG_USER_SCHED
-        uid_t uid;
-#endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
         /* schedulable entities of this group on each cpu */
@@ -274,35 +268,7 @@ struct task_group {
         struct list_head children;
 };
 
-#ifdef CONFIG_USER_SCHED
-
-/* Helper function to pass uid information to create_sched_user() */
-void set_tg_uid(struct user_struct *user)
-{
-        user->tg->uid = user->uid;
-}
-
-/*
- * Root task group.
- *      Every UID task group (including init_task_group aka UID-0) will
- *      be a child to this group.
- */
-struct task_group root_task_group;
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-/* Default task group's sched entity on each cpu */
-static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
-/* Default task group's cfs_rq on each cpu */
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct cfs_rq, init_tg_cfs_rq);
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-
-#ifdef CONFIG_RT_GROUP_SCHED
-static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct rt_rq, init_rt_rq_var);
-#endif /* CONFIG_RT_GROUP_SCHED */
-#else /* !CONFIG_USER_SCHED */
 #define root_task_group init_task_group
-#endif /* CONFIG_USER_SCHED */
 
 /* task_group_lock serializes add/remove of task groups and also changes to
  * a task group's cpu shares.
@@ -318,11 +284,7 @@ static int root_task_group_empty(void)
 }
 #endif
 
-#ifdef CONFIG_USER_SCHED
-# define INIT_TASK_GROUP_LOAD   (2*NICE_0_LOAD)
-#else /* !CONFIG_USER_SCHED */
 # define INIT_TASK_GROUP_LOAD   NICE_0_LOAD
-#endif /* CONFIG_USER_SCHED */
 
 /*
  * A weight of 0 or 1 can cause arithmetics problems.
@@ -348,11 +310,7 @@ static inline struct task_group *task_group(struct task_struct *p)
 {
         struct task_group *tg;
 
-#ifdef CONFIG_USER_SCHED
-        rcu_read_lock();
-        tg = __task_cred(p)->user->tg;
-        rcu_read_unlock();
-#elif defined(CONFIG_CGROUP_SCHED)
+#ifdef CONFIG_CGROUP_SCHED
         tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
                                 struct task_group, css);
 #else
@@ -383,7 +341,7 @@ static inline struct task_group *task_group(struct task_struct *p)
         return NULL;
 }
 
-#endif  /* CONFIG_GROUP_SCHED */
+#endif  /* CONFIG_CGROUP_SCHED */
 
 /* CFS-related fields in a runqueue */
 struct cfs_rq {
@@ -478,7 +436,6 @@ struct rt_rq {
         struct rq *rq;
         struct list_head leaf_rt_rq_list;
         struct task_group *tg;
-        struct sched_rt_entity *rt_se;
 #endif
 };
 
@@ -1414,32 +1371,6 @@ static const u32 prio_to_wmult[40] = {
  /*  15 */ 119304647, 148102320, 186737708, 238609294, 286331153,
 };
 
-static void activate_task(struct rq *rq, struct task_struct *p, int wakeup);
-
-/*
- * runqueue iterator, to support SMP load-balancing between different
- * scheduling classes, without having to expose their internal data
- * structures to the load-balancing proper:
- */
-struct rq_iterator {
-        void *arg;
-        struct task_struct *(*start)(void *);
-        struct task_struct *(*next)(void *);
-};
-
-#ifdef CONFIG_SMP
-static unsigned long
-balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
-              unsigned long max_load_move, struct sched_domain *sd,
-              enum cpu_idle_type idle, int *all_pinned,
-              int *this_best_prio, struct rq_iterator *iterator);
-
-static int
-iter_move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                   struct sched_domain *sd, enum cpu_idle_type idle,
-                   struct rq_iterator *iterator);
-#endif
-
 /* Time spent by the tasks of the cpu accounting group executing in ... */
 enum cpuacct_stat_index {
         CPUACCT_STAT_USER,      /* ... user mode */
@@ -1725,16 +1656,6 @@ static void update_shares(struct sched_domain *sd)
         }
 }
 
-static void update_shares_locked(struct rq *rq, struct sched_domain *sd)
-{
-        if (root_task_group_empty())
-                return;
-
-        raw_spin_unlock(&rq->lock);
-        update_shares(sd);
-        raw_spin_lock(&rq->lock);
-}
-
 static void update_h_load(long cpu)
 {
         if (root_task_group_empty())
@@ -1749,10 +1670,6 @@ static inline void update_shares(struct sched_domain *sd)
 {
 }
 
-static inline void update_shares_locked(struct rq *rq, struct sched_domain *sd)
-{
-}
-
 #endif
 
 #ifdef CONFIG_PREEMPT
@@ -1829,6 +1746,51 @@ static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
         raw_spin_unlock(&busiest->lock);
         lock_set_subclass(&this_rq->lock.dep_map, 0, _RET_IP_);
 }
+
+/*
+ * double_rq_lock - safely lock two runqueues
+ *
+ * Note this does not disable interrupts like task_rq_lock,
+ * you need to do so manually before calling.
+ */
+static void double_rq_lock(struct rq *rq1, struct rq *rq2)
+        __acquires(rq1->lock)
+        __acquires(rq2->lock)
+{
+        BUG_ON(!irqs_disabled());
+        if (rq1 == rq2) {
+                raw_spin_lock(&rq1->lock);
+                __acquire(rq2->lock);   /* Fake it out ;) */
+        } else {
+                if (rq1 < rq2) {
+                        raw_spin_lock(&rq1->lock);
+                        raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
+                } else {
+                        raw_spin_lock(&rq2->lock);
+                        raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
+                }
+        }
+        update_rq_clock(rq1);
+        update_rq_clock(rq2);
+}
+
+/*
+ * double_rq_unlock - safely unlock two runqueues
+ *
+ * Note this does not restore interrupts like task_rq_unlock,
+ * you need to do so manually after calling.
+ */
+static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
+        __releases(rq1->lock)
+        __releases(rq2->lock)
+{
+        raw_spin_unlock(&rq1->lock);
+        if (rq1 != rq2)
+                raw_spin_unlock(&rq2->lock);
+        else
+                __release(rq2->lock);
+}
+
 #endif
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1858,18 +1820,14 @@ static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
 #endif
 }
 
-#include "sched_stats.h"
-#include "sched_idletask.c"
-#include "sched_fair.c"
-#include "sched_rt.c"
-#ifdef CONFIG_SCHED_DEBUG
-# include "sched_debug.c"
-#endif
+static const struct sched_class rt_sched_class;
 
 #define sched_class_highest (&rt_sched_class)
 #define for_each_class(class) \
    for (class = sched_class_highest; class; class = class->next)
 
+#include "sched_stats.h"
+
 static void inc_nr_running(struct rq *rq)
 {
         rq->nr_running++;
@@ -1907,13 +1865,14 @@ static void update_avg(u64 *avg, u64 sample)
         *avg += diff >> 3;
 }
 
-static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
+static void
+enqueue_task(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 {
         if (wakeup)
                 p->se.start_runtime = p->se.sum_exec_runtime;
 
         sched_info_queued(p);
-        p->sched_class->enqueue_task(rq, p, wakeup);
+        p->sched_class->enqueue_task(rq, p, wakeup, head);
         p->se.on_rq = 1;
 }
 
@@ -1936,6 +1895,37 @@ static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
 }
 
 /*
+ * activate_task - move a task to the runqueue.
+ */
+static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
+{
+        if (task_contributes_to_load(p))
+                rq->nr_uninterruptible--;
+
+        enqueue_task(rq, p, wakeup, false);
+        inc_nr_running(rq);
+}
+
+/*
+ * deactivate_task - remove a task from the runqueue.
+ */
+static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
+{
+        if (task_contributes_to_load(p))
+                rq->nr_uninterruptible++;
+
+        dequeue_task(rq, p, sleep);
+        dec_nr_running(rq);
+}
+
+#include "sched_idletask.c"
+#include "sched_fair.c"
+#include "sched_rt.c"
+#ifdef CONFIG_SCHED_DEBUG
+# include "sched_debug.c"
+#endif
+
+/*
  * __normal_prio - return the priority that is based on the static prio
  */
 static inline int __normal_prio(struct task_struct *p)
@@ -1981,30 +1971,6 @@ static int effective_prio(struct task_struct *p)
         return p->prio;
 }
 
-/*
- * activate_task - move a task to the runqueue.
- */
-static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
-{
-        if (task_contributes_to_load(p))
-                rq->nr_uninterruptible--;
-
-        enqueue_task(rq, p, wakeup);
-        inc_nr_running(rq);
-}
-
-/*
- * deactivate_task - remove a task from the runqueue.
- */
-static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
-{
-        if (task_contributes_to_load(p))
-                rq->nr_uninterruptible++;
-
-        dequeue_task(rq, p, sleep);
-        dec_nr_running(rq);
-}
-
 /**
  * task_curr - is this task currently executing on a CPU?
  * @p: the task in question.
@@ -3148,50 +3114,6 @@ static void update_cpu_load(struct rq *this_rq)
 #ifdef CONFIG_SMP
 
 /*
- * double_rq_lock - safely lock two runqueues
- *
- * Note this does not disable interrupts like task_rq_lock,
- * you need to do so manually before calling.
- */
-static void double_rq_lock(struct rq *rq1, struct rq *rq2)
-        __acquires(rq1->lock)
-        __acquires(rq2->lock)
-{
-        BUG_ON(!irqs_disabled());
-        if (rq1 == rq2) {
-                raw_spin_lock(&rq1->lock);
-                __acquire(rq2->lock);   /* Fake it out ;) */
-        } else {
-                if (rq1 < rq2) {
-                        raw_spin_lock(&rq1->lock);
-                        raw_spin_lock_nested(&rq2->lock, SINGLE_DEPTH_NESTING);
-                } else {
-                        raw_spin_lock(&rq2->lock);
-                        raw_spin_lock_nested(&rq1->lock, SINGLE_DEPTH_NESTING);
-                }
-        }
-        update_rq_clock(rq1);
-        update_rq_clock(rq2);
-}
-
-/*
- * double_rq_unlock - safely unlock two runqueues
- *
- * Note this does not restore interrupts like task_rq_unlock,
- * you need to do so manually after calling.
- */
-static void double_rq_unlock(struct rq *rq1, struct rq *rq2)
-        __releases(rq1->lock)
-        __releases(rq2->lock)
-{
-        raw_spin_unlock(&rq1->lock);
-        if (rq1 != rq2)
-                raw_spin_unlock(&rq2->lock);
-        else
-                __release(rq2->lock);
-}
-
-/*
  * sched_exec - execve() is a valuable balancing opportunity, because at
  * this point the task has the smallest effective memory and cache footprint.
  */
@@ -3239,1782 +3161,6 @@ again:
         task_rq_unlock(rq, &flags);
 }
 
-/*
- * pull_task - move a task from a remote runqueue to the local runqueue.
- * Both runqueues must be locked.
- */
-static void pull_task(struct rq *src_rq, struct task_struct *p,
-                      struct rq *this_rq, int this_cpu)
-{
-        deactivate_task(src_rq, p, 0);
-        set_task_cpu(p, this_cpu);
-        activate_task(this_rq, p, 0);
-        check_preempt_curr(this_rq, p, 0);
-}
-
-/*
- * can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
- */
-static
-int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
-                     struct sched_domain *sd, enum cpu_idle_type idle,
-                     int *all_pinned)
-{
-        int tsk_cache_hot = 0;
-        /*
-         * We do not migrate tasks that are:
-         * 1) running (obviously), or
-         * 2) cannot be migrated to this CPU due to cpus_allowed, or
-         * 3) are cache-hot on their current CPU.
-         */
-        if (!cpumask_test_cpu(this_cpu, &p->cpus_allowed)) {
-                schedstat_inc(p, se.nr_failed_migrations_affine);
-                return 0;
-        }
-        *all_pinned = 0;
-
-        if (task_running(rq, p)) {
-                schedstat_inc(p, se.nr_failed_migrations_running);
-                return 0;
-        }
-
-        /*
-         * Aggressive migration if:
-         * 1) task is cache cold, or
-         * 2) too many balance attempts have failed.
-         */
-
-        tsk_cache_hot = task_hot(p, rq->clock, sd);
-        if (!tsk_cache_hot ||
-                sd->nr_balance_failed > sd->cache_nice_tries) {
-#ifdef CONFIG_SCHEDSTATS
-                if (tsk_cache_hot) {
-                        schedstat_inc(sd, lb_hot_gained[idle]);
-                        schedstat_inc(p, se.nr_forced_migrations);
-                }
-#endif
-                return 1;
-        }
-
-        if (tsk_cache_hot) {
-                schedstat_inc(p, se.nr_failed_migrations_hot);
-                return 0;
-        }
-        return 1;
-}
-
-static unsigned long
-balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
-              unsigned long max_load_move, struct sched_domain *sd,
-              enum cpu_idle_type idle, int *all_pinned,
-              int *this_best_prio, struct rq_iterator *iterator)
-{
-        int loops = 0, pulled = 0, pinned = 0;
-        struct task_struct *p;
-        long rem_load_move = max_load_move;
-
-        if (max_load_move == 0)
-                goto out;
-
-        pinned = 1;
-
-        /*
-         * Start the load-balancing iterator:
-         */
-        p = iterator->start(iterator->arg);
-next:
-        if (!p || loops++ > sysctl_sched_nr_migrate)
-                goto out;
-
-        if ((p->se.load.weight >> 1) > rem_load_move ||
-            !can_migrate_task(p, busiest, this_cpu, sd, idle, &pinned)) {
-                p = iterator->next(iterator->arg);
-                goto next;
-        }
-
-        pull_task(busiest, p, this_rq, this_cpu);
-        pulled++;
-        rem_load_move -= p->se.load.weight;
-
-#ifdef CONFIG_PREEMPT
-        /*
-         * NEWIDLE balancing is a source of latency, so preemptible kernels
-         * will stop after the first task is pulled to minimize the critical
-         * section.
-         */
-        if (idle == CPU_NEWLY_IDLE)
-                goto out;
-#endif
-
-        /*
-         * We only want to steal up to the prescribed amount of weighted load.
-         */
-        if (rem_load_move > 0) {
-                if (p->prio < *this_best_prio)
-                        *this_best_prio = p->prio;
-                p = iterator->next(iterator->arg);
-                goto next;
-        }
-out:
-        /*
-         * Right now, this is one of only two places pull_task() is called,
-         * so we can safely collect pull_task() stats here rather than
-         * inside pull_task().
-         */
-        schedstat_add(sd, lb_gained[idle], pulled);
-
-        if (all_pinned)
-                *all_pinned = pinned;
-
-        return max_load_move - rem_load_move;
-}
-
-/*
- * move_tasks tries to move up to max_load_move weighted load from busiest to
- * this_rq, as part of a balancing operation within domain "sd".
- * Returns 1 if successful and 0 otherwise.
- *
- * Called with both runqueues locked.
- */
-static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                      unsigned long max_load_move,
-                      struct sched_domain *sd, enum cpu_idle_type idle,
-                      int *all_pinned)
-{
-        const struct sched_class *class = sched_class_highest;
-        unsigned long total_load_moved = 0;
-        int this_best_prio = this_rq->curr->prio;
-
-        do {
-                total_load_moved +=
-                        class->load_balance(this_rq, this_cpu, busiest,
-                                max_load_move - total_load_moved,
-                                sd, idle, all_pinned, &this_best_prio);
-                class = class->next;
-
-#ifdef CONFIG_PREEMPT
-                /*
-                 * NEWIDLE balancing is a source of latency, so preemptible
-                 * kernels will stop after the first task is pulled to minimize
-                 * the critical section.
-                 */
-                if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
-                        break;
-#endif
-        } while (class && max_load_move > total_load_moved);
-
-        return total_load_moved > 0;
-}
-
-static int
-iter_move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                   struct sched_domain *sd, enum cpu_idle_type idle,
-                   struct rq_iterator *iterator)
-{
-        struct task_struct *p = iterator->start(iterator->arg);
-        int pinned = 0;
-
-        while (p) {
-                if (can_migrate_task(p, busiest, this_cpu, sd, idle, &pinned)) {
-                        pull_task(busiest, p, this_rq, this_cpu);
-                        /*
-                         * Right now, this is only the second place pull_task()
-                         * is called, so we can safely collect pull_task()
-                         * stats here rather than inside pull_task().
-                         */
-                        schedstat_inc(sd, lb_gained[idle]);
-
-                        return 1;
-                }
-                p = iterator->next(iterator->arg);
-        }
-
-        return 0;
-}
-
-/*
- * move_one_task tries to move exactly one task from busiest to this_rq, as
- * part of active balancing operations within "domain".
- * Returns 1 if successful and 0 otherwise.
- *
- * Called with both runqueues locked.
- */
-static int move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                         struct sched_domain *sd, enum cpu_idle_type idle)
-{
-        const struct sched_class *class;
-
-        for_each_class(class) {
-                if (class->move_one_task(this_rq, this_cpu, busiest, sd, idle))
-                        return 1;
-        }
-
-        return 0;
-}
-/********** Helpers for find_busiest_group ************************/
-/*
- * sd_lb_stats - Structure to store the statistics of a sched_domain
- *              during load balancing.
- */
-struct sd_lb_stats {
-        struct sched_group *busiest; /* Busiest group in this sd */
-        struct sched_group *this;  /* Local group in this sd */
-        unsigned long total_load;  /* Total load of all groups in sd */
-        unsigned long total_pwr;   /*   Total power of all groups in sd */
-        unsigned long avg_load;    /* Average load across all groups in sd */
-
-        /** Statistics of this group */
-        unsigned long this_load;
-        unsigned long this_load_per_task;
-        unsigned long this_nr_running;
-
-        /* Statistics of the busiest group */
-        unsigned long max_load;
-        unsigned long busiest_load_per_task;
-        unsigned long busiest_nr_running;
-
-        int group_imb; /* Is there imbalance in this sd */
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-        int power_savings_balance; /* Is powersave balance needed for this sd */
-        struct sched_group *group_min; /* Least loaded group in sd */
-        struct sched_group *group_leader; /* Group which relieves group_min */
-        unsigned long min_load_per_task; /* load_per_task in group_min */
-        unsigned long leader_nr_running; /* Nr running of group_leader */
-        unsigned long min_nr_running; /* Nr running of group_min */
-#endif
-};
-
-/*
- * sg_lb_stats - stats of a sched_group required for load_balancing
- */
-struct sg_lb_stats {
-        unsigned long avg_load; /*Avg load across the CPUs of the group */
-        unsigned long group_load; /* Total load over the CPUs of the group */
-        unsigned long sum_nr_running; /* Nr tasks running in the group */
-        unsigned long sum_weighted_load; /* Weighted load of group's tasks */
-        unsigned long group_capacity;
-        int group_imb; /* Is there an imbalance in the group ? */
-};
-
-/**
- * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
- * @group: The group whose first cpu is to be returned.
- */
-static inline unsigned int group_first_cpu(struct sched_group *group)
-{
-        return cpumask_first(sched_group_cpus(group));
-}
-
-/**
- * get_sd_load_idx - Obtain the load index for a given sched domain.
- * @sd: The sched_domain whose load_idx is to be obtained.
- * @idle: The Idle status of the CPU for whose sd load_icx is obtained.
- */
-static inline int get_sd_load_idx(struct sched_domain *sd,
-                                        enum cpu_idle_type idle)
-{
-        int load_idx;
-
-        switch (idle) {
-        case CPU_NOT_IDLE:
-                load_idx = sd->busy_idx;
-                break;
-
-        case CPU_NEWLY_IDLE:
-                load_idx = sd->newidle_idx;
-                break;
-        default:
-                load_idx = sd->idle_idx;
-                break;
-        }
-
-        return load_idx;
-}
-
-
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-/**
- * init_sd_power_savings_stats - Initialize power savings statistics for
- * the given sched_domain, during load balancing.
- *
- * @sd: Sched domain whose power-savings statistics are to be initialized.
- * @sds: Variable containing the statistics for sd.
- * @idle: Idle status of the CPU at which we're performing load-balancing.
- */
-static inline void init_sd_power_savings_stats(struct sched_domain *sd,
-        struct sd_lb_stats *sds, enum cpu_idle_type idle)
-{
-        /*
-         * Busy processors will not participate in power savings
-         * balance.
-         */
-        if (idle == CPU_NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
-                sds->power_savings_balance = 0;
-        else {
-                sds->power_savings_balance = 1;
-                sds->min_nr_running = ULONG_MAX;
-                sds->leader_nr_running = 0;
-        }
-}
-
-/**
- * update_sd_power_savings_stats - Update the power saving stats for a
- * sched_domain while performing load balancing.
- *
- * @group: sched_group belonging to the sched_domain under consideration.
- * @sds: Variable containing the statistics of the sched_domain
- * @local_group: Does group contain the CPU for which we're performing
- *              load balancing ?
- * @sgs: Variable containing the statistics of the group.
- */
-static inline void update_sd_power_savings_stats(struct sched_group *group,
-        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
-{
-
-        if (!sds->power_savings_balance)
-                return;
-
-        /*
-         * If the local group is idle or completely loaded
-         * no need to do power savings balance at this domain
-         */
-        if (local_group && (sds->this_nr_running >= sgs->group_capacity ||
-                                !sds->this_nr_running))
-                sds->power_savings_balance = 0;
-
-        /*
-         * If a group is already running at full capacity or idle,
-         * don't include that group in power savings calculations
-         */
-        if (!sds->power_savings_balance ||
-                sgs->sum_nr_running >= sgs->group_capacity ||
-                !sgs->sum_nr_running)
-                return;
-
-        /*
-         * Calculate the group which has the least non-idle load.
-         * This is the group from where we need to pick up the load
-         * for saving power
-         */
-        if ((sgs->sum_nr_running < sds->min_nr_running) ||
-            (sgs->sum_nr_running == sds->min_nr_running &&
-             group_first_cpu(group) > group_first_cpu(sds->group_min))) {
-                sds->group_min = group;
-                sds->min_nr_running = sgs->sum_nr_running;
-                sds->min_load_per_task = sgs->sum_weighted_load /
-                                                sgs->sum_nr_running;
-        }
-
-        /*
-         * Calculate the group which is almost near its
-         * capacity but still has some space to pick up some load
-         * from other group and save more power
-         */
-        if (sgs->sum_nr_running + 1 > sgs->group_capacity)
-                return;
-
-        if (sgs->sum_nr_running > sds->leader_nr_running ||
-            (sgs->sum_nr_running == sds->leader_nr_running &&
-             group_first_cpu(group) < group_first_cpu(sds->group_leader))) {
-                sds->group_leader = group;
-                sds->leader_nr_running = sgs->sum_nr_running;
-        }
-}
-
-/**
- * check_power_save_busiest_group - see if there is potential for some power-savings balance
- * @sds: Variable containing the statistics of the sched_domain
- *      under consideration.
- * @this_cpu: Cpu at which we're currently performing load-balancing.
- * @imbalance: Variable to store the imbalance.
- *
- * Description:
- * Check if we have potential to perform some power-savings balance.
- * If yes, set the busiest group to be the least loaded group in the
- * sched_domain, so that it's CPUs can be put to idle.
- *
- * Returns 1 if there is potential to perform power-savings balance.
- * Else returns 0.
- */
-static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
-                                        int this_cpu, unsigned long *imbalance)
-{
-        if (!sds->power_savings_balance)
-                return 0;
-
-        if (sds->this != sds->group_leader ||
-                        sds->group_leader == sds->group_min)
-                return 0;
-
-        *imbalance = sds->min_load_per_task;
-        sds->busiest = sds->group_min;
-
-        return 1;
-
-}
-#else /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-static inline void init_sd_power_savings_stats(struct sched_domain *sd,
-        struct sd_lb_stats *sds, enum cpu_idle_type idle)
-{
-        return;
-}
-
-static inline void update_sd_power_savings_stats(struct sched_group *group,
-        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
-{
-        return;
-}
-
-static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
-                                        int this_cpu, unsigned long *imbalance)
-{
-        return 0;
-}
-#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
-
-
-unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
-{
-        return SCHED_LOAD_SCALE;
-}
-
-unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)
-{
-        return default_scale_freq_power(sd, cpu);
-}
-
-unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu)
-{
-        unsigned long weight = cpumask_weight(sched_domain_span(sd));
-        unsigned long smt_gain = sd->smt_gain;
-
-        smt_gain /= weight;
-
-        return smt_gain;
-}
-
-unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)
-{
-        return default_scale_smt_power(sd, cpu);
-}
-
-unsigned long scale_rt_power(int cpu)
-{
-        struct rq *rq = cpu_rq(cpu);
-        u64 total, available;
-
-        sched_avg_update(rq);
-
-        total = sched_avg_period() + (rq->clock - rq->age_stamp);
-        available = total - rq->rt_avg;
-
-        if (unlikely((s64)total < SCHED_LOAD_SCALE))
-                total = SCHED_LOAD_SCALE;
-
-        total >>= SCHED_LOAD_SHIFT;
-
-        return div_u64(available, total);
-}
-
-static void update_cpu_power(struct sched_domain *sd, int cpu)
-{
-        unsigned long weight = cpumask_weight(sched_domain_span(sd));
-        unsigned long power = SCHED_LOAD_SCALE;
-        struct sched_group *sdg = sd->groups;
-
-        if (sched_feat(ARCH_POWER))
-                power *= arch_scale_freq_power(sd, cpu);
-        else
-                power *= default_scale_freq_power(sd, cpu);
-
-        power >>= SCHED_LOAD_SHIFT;
-
-        if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
-                if (sched_feat(ARCH_POWER))
-                        power *= arch_scale_smt_power(sd, cpu);
-                else
-                        power *= default_scale_smt_power(sd, cpu);
-
-                power >>= SCHED_LOAD_SHIFT;
-        }
-
-        power *= scale_rt_power(cpu);
-        power >>= SCHED_LOAD_SHIFT;
-
-        if (!power)
-                power = 1;
-
-        sdg->cpu_power = power;
-}
-
-static void update_group_power(struct sched_domain *sd, int cpu)
-{
-        struct sched_domain *child = sd->child;
-        struct sched_group *group, *sdg = sd->groups;
-        unsigned long power;
-
-        if (!child) {
-                update_cpu_power(sd, cpu);
-                return;
-        }
-
-        power = 0;
-
-        group = child->groups;
-        do {
-                power += group->cpu_power;
-                group = group->next;
-        } while (group != child->groups);
-
-        sdg->cpu_power = power;
-}
-
-/**
- * update_sg_lb_stats - Update sched_group's statistics for load balancing.
- * @sd: The sched_domain whose statistics are to be updated.
- * @group: sched_group whose statistics are to be updated.
- * @this_cpu: Cpu for which load balance is currently performed.
- * @idle: Idle status of this_cpu
- * @load_idx: Load index of sched_domain of this_cpu for load calc.
- * @sd_idle: Idle status of the sched_domain containing group.
- * @local_group: Does group contain this_cpu.
- * @cpus: Set of cpus considered for load balancing.
- * @balance: Should we balance.
- * @sgs: variable to hold the statistics for this group.
- */
-static inline void update_sg_lb_stats(struct sched_domain *sd,
-                        struct sched_group *group, int this_cpu,
-                        enum cpu_idle_type idle, int load_idx, int *sd_idle,
-                        int local_group, const struct cpumask *cpus,
-                        int *balance, struct sg_lb_stats *sgs)
-{
-        unsigned long load, max_cpu_load, min_cpu_load;
-        int i;
-        unsigned int balance_cpu = -1, first_idle_cpu = 0;
-        unsigned long sum_avg_load_per_task;
-        unsigned long avg_load_per_task;
-
-        if (local_group) {
-                balance_cpu = group_first_cpu(group);
-                if (balance_cpu == this_cpu)
-                        update_group_power(sd, this_cpu);
-        }
-
-        /* Tally up the load of all CPUs in the group */
-        sum_avg_load_per_task = avg_load_per_task = 0;
-        max_cpu_load = 0;
-        min_cpu_load = ~0UL;
-
-        for_each_cpu_and(i, sched_group_cpus(group), cpus) {
-                struct rq *rq = cpu_rq(i);
-
-                if (*sd_idle && rq->nr_running)
-                        *sd_idle = 0;
-
-                /* Bias balancing toward cpus of our domain */
-                if (local_group) {
-                        if (idle_cpu(i) && !first_idle_cpu) {
-                                first_idle_cpu = 1;
-                                balance_cpu = i;
-                        }
-
-                        load = target_load(i, load_idx);
-                } else {
-                        load = source_load(i, load_idx);
-                        if (load > max_cpu_load)
-                                max_cpu_load = load;
-                        if (min_cpu_load > load)
-                                min_cpu_load = load;
-                }
-
-                sgs->group_load += load;
-                sgs->sum_nr_running += rq->nr_running;
-                sgs->sum_weighted_load += weighted_cpuload(i);
-
-                sum_avg_load_per_task += cpu_avg_load_per_task(i);
-        }
-
-        /*
-         * First idle cpu or the first cpu(busiest) in this sched group
-         * is eligible for doing load balancing at this and above
-         * domains. In the newly idle case, we will allow all the cpu's
-         * to do the newly idle load balance.
-         */
-        if (idle != CPU_NEWLY_IDLE && local_group &&
-            balance_cpu != this_cpu && balance) {
-                *balance = 0;
-                return;
-        }
-
-        /* Adjust by relative CPU power of the group */
-        sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
-
-
-        /*
-         * Consider the group unbalanced when the imbalance is larger
-         * than the average weight of two tasks.
-         *
-         * APZ: with cgroup the avg task weight can vary wildly and
-         *      might not be a suitable number - should we keep a
-         *      normalized nr_running number somewhere that negates
-         *      the hierarchy?
-         */
-        avg_load_per_task = (sum_avg_load_per_task * SCHED_LOAD_SCALE) /
-                group->cpu_power;
-
-        if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task)
-                sgs->group_imb = 1;
-
-        sgs->group_capacity =
-                DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
-}
-
-/**
- * update_sd_lb_stats - Update sched_group's statistics for load balancing.
- * @sd: sched_domain whose statistics are to be updated.
- * @this_cpu: Cpu for which load balance is currently performed.
- * @idle: Idle status of this_cpu
- * @sd_idle: Idle status of the sched_domain containing group.
- * @cpus: Set of cpus considered for load balancing.
- * @balance: Should we balance.
- * @sds: variable to hold the statistics for this sched_domain.
- */
-static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
-                        enum cpu_idle_type idle, int *sd_idle,
-                        const struct cpumask *cpus, int *balance,
-                        struct sd_lb_stats *sds)
-{
-        struct sched_domain *child = sd->child;
-        struct sched_group *group = sd->groups;
-        struct sg_lb_stats sgs;
-        int load_idx, prefer_sibling = 0;
-
-        if (child && child->flags & SD_PREFER_SIBLING)
-                prefer_sibling = 1;
-
-        init_sd_power_savings_stats(sd, sds, idle);
-        load_idx = get_sd_load_idx(sd, idle);
-
-        do {
-                int local_group;
-
-                local_group = cpumask_test_cpu(this_cpu,
-                                               sched_group_cpus(group));
-                memset(&sgs, 0, sizeof(sgs));
-                update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
-                                local_group, cpus, balance, &sgs);
-
-                if (local_group && balance && !(*balance))
-                        return;
-
-                sds->total_load += sgs.group_load;
-                sds->total_pwr += group->cpu_power;
-
-                /*
-                 * In case the child domain prefers tasks go to siblings
-                 * first, lower the group capacity to one so that we'll try
-                 * and move all the excess tasks away.
-                 */
-                if (prefer_sibling)
-                        sgs.group_capacity = min(sgs.group_capacity, 1UL);
-
-                if (local_group) {
-                        sds->this_load = sgs.avg_load;
-                        sds->this = group;
-                        sds->this_nr_running = sgs.sum_nr_running;
-                        sds->this_load_per_task = sgs.sum_weighted_load;
-                } else if (sgs.avg_load > sds->max_load &&
-                           (sgs.sum_nr_running > sgs.group_capacity ||
-                                sgs.group_imb)) {
-                        sds->max_load = sgs.avg_load;
-                        sds->busiest = group;
-                        sds->busiest_nr_running = sgs.sum_nr_running;
-                        sds->busiest_load_per_task = sgs.sum_weighted_load;
-                        sds->group_imb = sgs.group_imb;
-                }
-
-                update_sd_power_savings_stats(group, sds, local_group, &sgs);
-                group = group->next;
-        } while (group != sd->groups);
-}
-
-/**
- * fix_small_imbalance - Calculate the minor imbalance that exists
- *                      amongst the groups of a sched_domain, during
- *                      load balancing.
- * @sds: Statistics of the sched_domain whose imbalance is to be calculated.
- * @this_cpu: The cpu at whose sched_domain we're performing load-balance.
- * @imbalance: Variable to store the imbalance.
- */
-static inline void fix_small_imbalance(struct sd_lb_stats *sds,
-                                int this_cpu, unsigned long *imbalance)
-{
-        unsigned long tmp, pwr_now = 0, pwr_move = 0;
-        unsigned int imbn = 2;
-
-        if (sds->this_nr_running) {
-                sds->this_load_per_task /= sds->this_nr_running;
-                if (sds->busiest_load_per_task >
-                                sds->this_load_per_task)
-                        imbn = 1;
-        } else
-                sds->this_load_per_task =
-                        cpu_avg_load_per_task(this_cpu);
-
-        if (sds->max_load - sds->this_load + sds->busiest_load_per_task >=
-                        sds->busiest_load_per_task * imbn) {
-                *imbalance = sds->busiest_load_per_task;
-                return;
-        }
-
-        /*
-         * OK, we don't have enough imbalance to justify moving tasks,
-         * however we may be able to increase total CPU power used by
-         * moving them.
-         */
-
-        pwr_now += sds->busiest->cpu_power *
-                        min(sds->busiest_load_per_task, sds->max_load);
-        pwr_now += sds->this->cpu_power *
-                        min(sds->this_load_per_task, sds->this_load);
-        pwr_now /= SCHED_LOAD_SCALE;
-
-        /* Amount of load we'd subtract */
-        tmp = (sds->busiest_load_per_task * SCHED_LOAD_SCALE) /
-                sds->busiest->cpu_power;
-        if (sds->max_load > tmp)
-                pwr_move += sds->busiest->cpu_power *
-                        min(sds->busiest_load_per_task, sds->max_load - tmp);
-
-        /* Amount of load we'd add */
-        if (sds->max_load * sds->busiest->cpu_power <
-                sds->busiest_load_per_task * SCHED_LOAD_SCALE)
-                tmp = (sds->max_load * sds->busiest->cpu_power) /
-                        sds->this->cpu_power;
-        else
-                tmp = (sds->busiest_load_per_task * SCHED_LOAD_SCALE) /
-                        sds->this->cpu_power;
-        pwr_move += sds->this->cpu_power *
-                        min(sds->this_load_per_task, sds->this_load + tmp);
-        pwr_move /= SCHED_LOAD_SCALE;
-
-        /* Move if we gain throughput */
-        if (pwr_move > pwr_now)
-                *imbalance = sds->busiest_load_per_task;
-}
-
-/**
- * calculate_imbalance - Calculate the amount of imbalance present within the
- *                       groups of a given sched_domain during load balance.
- * @sds: statistics of the sched_domain whose imbalance is to be calculated.
- * @this_cpu: Cpu for which currently load balance is being performed.
- * @imbalance: The variable to store the imbalance.
- */
-static inline void calculate_imbalance(struct sd_lb_stats *sds, int this_cpu,
-                unsigned long *imbalance)
-{
-        unsigned long max_pull;
-        /*
-         * In the presence of smp nice balancing, certain scenarios can have
-         * max load less than avg load(as we skip the groups at or below
-         * its cpu_power, while calculating max_load..)
-         */
-        if (sds->max_load < sds->avg_load) {
-                *imbalance = 0;
-                return fix_small_imbalance(sds, this_cpu, imbalance);
-        }
-
-        /* Don't want to pull so many tasks that a group would go idle */
-        max_pull = min(sds->max_load - sds->avg_load,
-                        sds->max_load - sds->busiest_load_per_task);
-
-        /* How much load to actually move to equalise the imbalance */
-        *imbalance = min(max_pull * sds->busiest->cpu_power,
-                (sds->avg_load - sds->this_load) * sds->this->cpu_power)
-                        / SCHED_LOAD_SCALE;
-
-        /*
-         * if *imbalance is less than the average load per runnable task
-         * there is no gaurantee that any tasks will be moved so we'll have
-         * a think about bumping its value to force at least one task to be
-         * moved
-         */
-        if (*imbalance < sds->busiest_load_per_task)
-                return fix_small_imbalance(sds, this_cpu, imbalance);
-
-}
-/******* find_busiest_group() helpers end here *********************/
-
-/**
- * find_busiest_group - Returns the busiest group within the sched_domain
- * if there is an imbalance. If there isn't an imbalance, and
- * the user has opted for power-savings, it returns a group whose
- * CPUs can be put to idle by rebalancing those tasks elsewhere, if
- * such a group exists.
- *
- * Also calculates the amount of weighted load which should be moved
- * to restore balance.
- *
- * @sd: The sched_domain whose busiest group is to be returned.
- * @this_cpu: The cpu for which load balancing is currently being performed.
- * @imbalance: Variable which stores amount of weighted load which should
- *              be moved to restore balance/put a group to idle.
- * @idle: The idle status of this_cpu.
- * @sd_idle: The idleness of sd
- * @cpus: The set of CPUs under consideration for load-balancing.
- * @balance: Pointer to a variable indicating if this_cpu
- *      is the appropriate cpu to perform load balancing at this_level.
- *
- * Returns:     - the busiest group if imbalance exists.
- *              - If no imbalance and user has opted for power-savings balance,
- *                 return the least loaded group whose CPUs can be
- *                 put to idle by rebalancing its tasks onto our group.
- */
-static struct sched_group *
-find_busiest_group(struct sched_domain *sd, int this_cpu,
-                   unsigned long *imbalance, enum cpu_idle_type idle,
-                   int *sd_idle, const struct cpumask *cpus, int *balance)
-{
-        struct sd_lb_stats sds;
-
-        memset(&sds, 0, sizeof(sds));
-
-        /*
-         * Compute the various statistics relavent for load balancing at
-         * this level.
-         */
-        update_sd_lb_stats(sd, this_cpu, idle, sd_idle, cpus,
-                                        balance, &sds);
-
-        /* Cases where imbalance does not exist from POV of this_cpu */
-        /* 1) this_cpu is not the appropriate cpu to perform load balancing
-         *    at this level.
-         * 2) There is no busy sibling group to pull from.
-         * 3) This group is the busiest group.
-         * 4) This group is more busy than the avg busieness at this
-         *    sched_domain.
-         * 5) The imbalance is within the specified limit.
-         * 6) Any rebalance would lead to ping-pong
-         */
-        if (balance && !(*balance))
-                goto ret;
-
-        if (!sds.busiest || sds.busiest_nr_running == 0)
-                goto out_balanced;
-
-        if (sds.this_load >= sds.max_load)
-                goto out_balanced;
-
-        sds.avg_load = (SCHED_LOAD_SCALE * sds.total_load) / sds.total_pwr;
-
-        if (sds.this_load >= sds.avg_load)
-                goto out_balanced;
-
-        if (100 * sds.max_load <= sd->imbalance_pct * sds.this_load)
-                goto out_balanced;
-
-        sds.busiest_load_per_task /= sds.busiest_nr_running;
-        if (sds.group_imb)
-                sds.busiest_load_per_task =
-                        min(sds.busiest_load_per_task, sds.avg_load);
-
-        /*
-         * We're trying to get all the cpus to the average_load, so we don't
-         * want to push ourselves above the average load, nor do we wish to
-         * reduce the max loaded cpu below the average load, as either of these
-         * actions would just result in more rebalancing later, and ping-pong
-         * tasks around. Thus we look for the minimum possible imbalance.
-         * Negative imbalances (*we* are more loaded than anyone else) will
-         * be counted as no imbalance for these purposes -- we can't fix that
-         * by pulling tasks to us. Be careful of negative numbers as they'll
-         * appear as very large values with unsigned longs.
-         */
-        if (sds.max_load <= sds.busiest_load_per_task)
-                goto out_balanced;
-
-        /* Looks like there is an imbalance. Compute it */
-        calculate_imbalance(&sds, this_cpu, imbalance);
-        return sds.busiest;
-
-out_balanced:
-        /*
-         * There is no obvious imbalance. But check if we can do some balancing
-         * to save power.
-         */
-        if (check_power_save_busiest_group(&sds, this_cpu, imbalance))
-                return sds.busiest;
-ret:
-        *imbalance = 0;
-        return NULL;
-}
-
-/*
- * find_busiest_queue - find the busiest runqueue among the cpus in group.
- */
-static struct rq *
-find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
-                   unsigned long imbalance, const struct cpumask *cpus)
-{
-        struct rq *busiest = NULL, *rq;
-        unsigned long max_load = 0;
-        int i;
-
-        for_each_cpu(i, sched_group_cpus(group)) {
-                unsigned long power = power_of(i);
-                unsigned long capacity = DIV_ROUND_CLOSEST(power, SCHED_LOAD_SCALE);
-                unsigned long wl;
-
-                if (!cpumask_test_cpu(i, cpus))
-                        continue;
-
-                rq = cpu_rq(i);
-                wl = weighted_cpuload(i);
-
-                /*
-                 * When comparing with imbalance, use weighted_cpuload()
-                 * which is not scaled with the cpu power.
-                 */
-                if (capacity && rq->nr_running == 1 && wl > imbalance)
-                        continue;
-
-                /*
-                 * For the load comparisons with the other cpu's, consider
-                 * the weighted_cpuload() scaled with the cpu power, so that
-                 * the load can be moved away from the cpu that is potentially
-                 * running at a lower capacity.
-                 */
-                wl = (wl * SCHED_LOAD_SCALE) / power;
-
-                if (wl > max_load) {
-                        max_load = wl;
-                        busiest = rq;
-                }
-        }
-
-        return busiest;
-}
-
-/*
- * Max backoff if we encounter pinned tasks. Pretty arbitrary value, but
- * so long as it is large enough.
- */
-#define MAX_PINNED_INTERVAL     512
-
-/* Working cpumask for load_balance and load_balance_newidle. */
-static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
-
-/*
- * Check this_cpu to ensure it is balanced within domain. Attempt to move
- * tasks if there is an imbalance.
- */
-static int load_balance(int this_cpu, struct rq *this_rq,
-                        struct sched_domain *sd, enum cpu_idle_type idle,
-                        int *balance)
-{
-        int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
-        struct sched_group *group;
-        unsigned long imbalance;
-        struct rq *busiest;
-        unsigned long flags;
-        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
-
-        cpumask_copy(cpus, cpu_active_mask);
-
-        /*
-         * When power savings policy is enabled for the parent domain, idle
-         * sibling can pick up load irrespective of busy siblings. In this case,
-         * let the state of idle sibling percolate up as CPU_IDLE, instead of
-         * portraying it as CPU_NOT_IDLE.
-         */
-        if (idle != CPU_NOT_IDLE && sd->flags & SD_SHARE_CPUPOWER &&
-            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                sd_idle = 1;
-
-        schedstat_inc(sd, lb_count[idle]);
-
-redo:
-        update_shares(sd);
-        group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle,
-                                   cpus, balance);
-
-        if (*balance == 0)
-                goto out_balanced;
-
-        if (!group) {
-                schedstat_inc(sd, lb_nobusyg[idle]);
-                goto out_balanced;
-        }
-
-        busiest = find_busiest_queue(group, idle, imbalance, cpus);
-        if (!busiest) {
-                schedstat_inc(sd, lb_nobusyq[idle]);
-                goto out_balanced;
-        }
-
-        BUG_ON(busiest == this_rq);
-
-        schedstat_add(sd, lb_imbalance[idle], imbalance);
-
-        ld_moved = 0;
-        if (busiest->nr_running > 1) {
-                /*
-                 * Attempt to move tasks. If find_busiest_group has found
-                 * an imbalance but busiest->nr_running <= 1, the group is
-                 * still unbalanced. ld_moved simply stays zero, so it is
-                 * correctly treated as an imbalance.
-                 */
-                local_irq_save(flags);
-                double_rq_lock(this_rq, busiest);
-                ld_moved = move_tasks(this_rq, this_cpu, busiest,
-                                      imbalance, sd, idle, &all_pinned);
-                double_rq_unlock(this_rq, busiest);
-                local_irq_restore(flags);
-
-                /*
-                 * some other cpu did the load balance for us.
-                 */
-                if (ld_moved && this_cpu != smp_processor_id())
-                        resched_cpu(this_cpu);
-
-                /* All tasks on this runqueue were pinned by CPU affinity */
-                if (unlikely(all_pinned)) {
-                        cpumask_clear_cpu(cpu_of(busiest), cpus);
-                        if (!cpumask_empty(cpus))
-                                goto redo;
-                        goto out_balanced;
-                }
-        }
-
-        if (!ld_moved) {
-                schedstat_inc(sd, lb_failed[idle]);
-                sd->nr_balance_failed++;
-
-                if (unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2)) {
-
-                        raw_spin_lock_irqsave(&busiest->lock, flags);
-
-                        /* don't kick the migration_thread, if the curr
-                         * task on busiest cpu can't be moved to this_cpu
-                         */
-                        if (!cpumask_test_cpu(this_cpu,
-                                              &busiest->curr->cpus_allowed)) {
-                                raw_spin_unlock_irqrestore(&busiest->lock,
-                                                            flags);
-                                all_pinned = 1;
-                                goto out_one_pinned;
-                        }
-
-                        if (!busiest->active_balance) {
-                                busiest->active_balance = 1;
-                                busiest->push_cpu = this_cpu;
-                                active_balance = 1;
-                        }
-                        raw_spin_unlock_irqrestore(&busiest->lock, flags);
-                        if (active_balance)
-                                wake_up_process(busiest->migration_thread);
-
-                        /*
-                         * We've kicked active balancing, reset the failure
-                         * counter.
-                         */
-                        sd->nr_balance_failed = sd->cache_nice_tries+1;
-                }
-        } else
-                sd->nr_balance_failed = 0;
-
-        if (likely(!active_balance)) {
-                /* We were unbalanced, so reset the balancing interval */
-                sd->balance_interval = sd->min_interval;
-        } else {
-                /*
-                 * If we've begun active balancing, start to back off. This
-                 * case may not be covered by the all_pinned logic if there
-                 * is only 1 task on the busy runqueue (because we don't call
-                 * move_tasks).
-                 */
-                if (sd->balance_interval < sd->max_interval)
-                        sd->balance_interval *= 2;
-        }
-
-        if (!ld_moved && !sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
-            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                ld_moved = -1;
-
-        goto out;
-
-out_balanced:
-        schedstat_inc(sd, lb_balanced[idle]);
-
-        sd->nr_balance_failed = 0;
-
-out_one_pinned:
-        /* tune up the balancing interval */
-        if ((all_pinned && sd->balance_interval < MAX_PINNED_INTERVAL) ||
-                        (sd->balance_interval < sd->max_interval))
-                sd->balance_interval *= 2;
-
-        if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
-            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                ld_moved = -1;
-        else
-                ld_moved = 0;
-out:
-        if (ld_moved)
-                update_shares(sd);
-        return ld_moved;
-}
-
-/*
- * Check this_cpu to ensure it is balanced within domain. Attempt to move
- * tasks if there is an imbalance.
- *
- * Called from schedule when this_rq is about to become idle (CPU_NEWLY_IDLE).
- * this_rq is locked.
- */
-static int
-load_balance_newidle(int this_cpu, struct rq *this_rq, struct sched_domain *sd)
-{
-        struct sched_group *group;
-        struct rq *busiest = NULL;
-        unsigned long imbalance;
-        int ld_moved = 0;
-        int sd_idle = 0;
-        int all_pinned = 0;
-        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
-
-        cpumask_copy(cpus, cpu_active_mask);
-
-        /*
-         * When power savings policy is enabled for the parent domain, idle
-         * sibling can pick up load irrespective of busy siblings. In this case,
-         * let the state of idle sibling percolate up as IDLE, instead of
-         * portraying it as CPU_NOT_IDLE.
-         */
-        if (sd->flags & SD_SHARE_CPUPOWER &&
-            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                sd_idle = 1;
-
-        schedstat_inc(sd, lb_count[CPU_NEWLY_IDLE]);
-redo:
-        update_shares_locked(this_rq, sd);
-        group = find_busiest_group(sd, this_cpu, &imbalance, CPU_NEWLY_IDLE,
-                                   &sd_idle, cpus, NULL);
-        if (!group) {
-                schedstat_inc(sd, lb_nobusyg[CPU_NEWLY_IDLE]);
-                goto out_balanced;
-        }
-
-        busiest = find_busiest_queue(group, CPU_NEWLY_IDLE, imbalance, cpus);
-        if (!busiest) {
-                schedstat_inc(sd, lb_nobusyq[CPU_NEWLY_IDLE]);
-                goto out_balanced;
-        }
-
-        BUG_ON(busiest == this_rq);
-
-        schedstat_add(sd, lb_imbalance[CPU_NEWLY_IDLE], imbalance);
-
-        ld_moved = 0;
-        if (busiest->nr_running > 1) {
-                /* Attempt to move tasks */
-                double_lock_balance(this_rq, busiest);
-                /* this_rq->clock is already updated */
-                update_rq_clock(busiest);
-                ld_moved = move_tasks(this_rq, this_cpu, busiest,
-                                        imbalance, sd, CPU_NEWLY_IDLE,
-                                        &all_pinned);
-                double_unlock_balance(this_rq, busiest);
-
-                if (unlikely(all_pinned)) {
-                        cpumask_clear_cpu(cpu_of(busiest), cpus);
-                        if (!cpumask_empty(cpus))
-                                goto redo;
-                }
-        }
-
-        if (!ld_moved) {
-                int active_balance = 0;
-
-                schedstat_inc(sd, lb_failed[CPU_NEWLY_IDLE]);
-                if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
-                    !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                        return -1;
-
-                if (sched_mc_power_savings < POWERSAVINGS_BALANCE_WAKEUP)
-                        return -1;
-
-                if (sd->nr_balance_failed++ < 2)
-                        return -1;
-
-                /*
-                 * The only task running in a non-idle cpu can be moved to this
-                 * cpu in an attempt to completely freeup the other CPU
-                 * package. The same method used to move task in load_balance()
-                 * have been extended for load_balance_newidle() to speedup
-                 * consolidation at sched_mc=POWERSAVINGS_BALANCE_WAKEUP (2)
-                 *
-                 * The package power saving logic comes from
-                 * find_busiest_group().  If there are no imbalance, then
-                 * f_b_g() will return NULL.  However when sched_mc={1,2} then
-                 * f_b_g() will select a group from which a running task may be
-                 * pulled to this cpu in order to make the other package idle.
-                 * If there is no opportunity to make a package idle and if
-                 * there are no imbalance, then f_b_g() will return NULL and no
-                 * action will be taken in load_balance_newidle().
-                 *
-                 * Under normal task pull operation due to imbalance, there
-                 * will be more than one task in the source run queue and
-                 * move_tasks() will succeed.  ld_moved will be true and this
-                 * active balance code will not be triggered.
-                 */
-
-                /* Lock busiest in correct order while this_rq is held */
-                double_lock_balance(this_rq, busiest);
-
-                /*
-                 * don't kick the migration_thread, if the curr
-                 * task on busiest cpu can't be moved to this_cpu
-                 */
-                if (!cpumask_test_cpu(this_cpu, &busiest->curr->cpus_allowed)) {
-                        double_unlock_balance(this_rq, busiest);
-                        all_pinned = 1;
-                        return ld_moved;
-                }
-
-                if (!busiest->active_balance) {
-                        busiest->active_balance = 1;
-                        busiest->push_cpu = this_cpu;
-                        active_balance = 1;
-                }
-
-                double_unlock_balance(this_rq, busiest);
-                /*
-                 * Should not call ttwu while holding a rq->lock
-                 */
-                raw_spin_unlock(&this_rq->lock);
-                if (active_balance)
-                        wake_up_process(busiest->migration_thread);
-                raw_spin_lock(&this_rq->lock);
-
-        } else
-                sd->nr_balance_failed = 0;
-
-        update_shares_locked(this_rq, sd);
-        return ld_moved;
-
-out_balanced:
-        schedstat_inc(sd, lb_balanced[CPU_NEWLY_IDLE]);
-        if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
-            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
-                return -1;
-        sd->nr_balance_failed = 0;
-
-        return 0;
-}
-
-/*
- * idle_balance is called by schedule() if this_cpu is about to become
- * idle. Attempts to pull tasks from other CPUs.
- */
-static void idle_balance(int this_cpu, struct rq *this_rq)
-{
-        struct sched_domain *sd;
-        int pulled_task = 0;
-        unsigned long next_balance = jiffies + HZ;
-
-        this_rq->idle_stamp = this_rq->clock;
-
-        if (this_rq->avg_idle < sysctl_sched_migration_cost)
-                return;
-
-        for_each_domain(this_cpu, sd) {
-                unsigned long interval;
-
-                if (!(sd->flags & SD_LOAD_BALANCE))
-                        continue;
-
-                if (sd->flags & SD_BALANCE_NEWIDLE)
-                        /* If we've pulled tasks over stop searching: */
-                        pulled_task = load_balance_newidle(this_cpu, this_rq,
-                                                           sd);
-
-                interval = msecs_to_jiffies(sd->balance_interval);
-                if (time_after(next_balance, sd->last_balance + interval))
-                        next_balance = sd->last_balance + interval;
-                if (pulled_task) {
-                        this_rq->idle_stamp = 0;
-                        break;
-                }
-        }
-        if (pulled_task || time_after(jiffies, this_rq->next_balance)) {
-                /*
-                 * We are going idle. next_balance may be set based on
-                 * a busy processor. So reset next_balance.
-                 */
-                this_rq->next_balance = next_balance;
-        }
-}
-
-/*
- * active_load_balance is run by migration threads. It pushes running tasks
- * off the busiest CPU onto idle CPUs. It requires at least 1 task to be
- * running on each physical CPU where possible, and avoids physical /
- * logical imbalances.
- *
- * Called with busiest_rq locked.
- */
-static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
-{
-        int target_cpu = busiest_rq->push_cpu;
-        struct sched_domain *sd;
-        struct rq *target_rq;
-
-        /* Is there any task to move? */
-        if (busiest_rq->nr_running <= 1)
-                return;
-
-        target_rq = cpu_rq(target_cpu);
-
-        /*
-         * This condition is "impossible", if it occurs
-         * we need to fix it. Originally reported by
-         * Bjorn Helgaas on a 128-cpu setup.
-         */
-        BUG_ON(busiest_rq == target_rq);
-
-        /* move a task from busiest_rq to target_rq */
-        double_lock_balance(busiest_rq, target_rq);
-        update_rq_clock(busiest_rq);
-        update_rq_clock(target_rq);
-
-        /* Search for an sd spanning us and the target CPU. */
-        for_each_domain(target_cpu, sd) {
-                if ((sd->flags & SD_LOAD_BALANCE) &&
-                    cpumask_test_cpu(busiest_cpu, sched_domain_span(sd)))
-                                break;
-        }
-
-        if (likely(sd)) {
-                schedstat_inc(sd, alb_count);
-
-                if (move_one_task(target_rq, target_cpu, busiest_rq,
-                                  sd, CPU_IDLE))
-                        schedstat_inc(sd, alb_pushed);
-                else
-                        schedstat_inc(sd, alb_failed);
-        }
-        double_unlock_balance(busiest_rq, target_rq);
-}
-
-#ifdef CONFIG_NO_HZ
-static struct {
-        atomic_t load_balancer;
-        cpumask_var_t cpu_mask;
-        cpumask_var_t ilb_grp_nohz_mask;
-} nohz ____cacheline_aligned = {
-        .load_balancer = ATOMIC_INIT(-1),
-};
-
-int get_nohz_load_balancer(void)
-{
-        return atomic_read(&nohz.load_balancer);
-}
-
-#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-/**
- * lowest_flag_domain - Return lowest sched_domain containing flag.
- * @cpu:        The cpu whose lowest level of sched domain is to
- *              be returned.
- * @flag:       The flag to check for the lowest sched_domain
- *              for the given cpu.
- *
- * Returns the lowest sched_domain of a cpu which contains the given flag.
- */
-static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
-{
-        struct sched_domain *sd;
-
-        for_each_domain(cpu, sd)
-                if (sd && (sd->flags & flag))
-                        break;
-
-        return sd;
-}
-
-/**
- * for_each_flag_domain - Iterates over sched_domains containing the flag.
- * @cpu:        The cpu whose domains we're iterating over.
- * @sd:         variable holding the value of the power_savings_sd
- *              for cpu.
- * @flag:       The flag to filter the sched_domains to be iterated.
- *
- * Iterates over all the scheduler domains for a given cpu that has the 'flag'
- * set, starting from the lowest sched_domain to the highest.
- */
-#define for_each_flag_domain(cpu, sd, flag) \
-        for (sd = lowest_flag_domain(cpu, flag); \
-                (sd && (sd->flags & flag)); sd = sd->parent)
-
-/**
- * is_semi_idle_group - Checks if the given sched_group is semi-idle.
- * @ilb_group:  group to be checked for semi-idleness
- *
- * Returns:     1 if the group is semi-idle. 0 otherwise.
- *
- * We define a sched_group to be semi idle if it has atleast one idle-CPU
- * and atleast one non-idle CPU. This helper function checks if the given
- * sched_group is semi-idle or not.
- */
-static inline int is_semi_idle_group(struct sched_group *ilb_group)
-{
-        cpumask_and(nohz.ilb_grp_nohz_mask, nohz.cpu_mask,
-                                        sched_group_cpus(ilb_group));
-
-        /*
-         * A sched_group is semi-idle when it has atleast one busy cpu
-         * and atleast one idle cpu.
-         */
-        if (cpumask_empty(nohz.ilb_grp_nohz_mask))
-                return 0;
-
-        if (cpumask_equal(nohz.ilb_grp_nohz_mask, sched_group_cpus(ilb_group)))
-                return 0;
-
-        return 1;
-}
-/**
- * find_new_ilb - Finds the optimum idle load balancer for nomination.
- * @cpu:        The cpu which is nominating a new idle_load_balancer.
- *
- * Returns:     Returns the id of the idle load balancer if it exists,
- *              Else, returns >= nr_cpu_ids.
- *
- * This algorithm picks the idle load balancer such that it belongs to a
- * semi-idle powersavings sched_domain. The idea is to try and avoid
- * completely idle packages/cores just for the purpose of idle load balancing
- * when there are other idle cpu's which are better suited for that job.
- */
-static int find_new_ilb(int cpu)
-{
-        struct sched_domain *sd;
-        struct sched_group *ilb_group;
-
-        /*
-         * Have idle load balancer selection from semi-idle packages only
-         * when power-aware load balancing is enabled
-         */
-        if (!(sched_smt_power_savings || sched_mc_power_savings))
-                goto out_done;
-
-        /*
-         * Optimize for the case when we have no idle CPUs or only one
-         * idle CPU. Don't walk the sched_domain hierarchy in such cases
-         */
-        if (cpumask_weight(nohz.cpu_mask) < 2)
-                goto out_done;
-
-        for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
-                ilb_group = sd->groups;
-
-                do {
-                        if (is_semi_idle_group(ilb_group))
-                                return cpumask_first(nohz.ilb_grp_nohz_mask);
-
-                        ilb_group = ilb_group->next;
-
-                } while (ilb_group != sd->groups);
-        }
-
-out_done:
-        return cpumask_first(nohz.cpu_mask);
-}
-#else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
-static inline int find_new_ilb(int call_cpu)
-{
-        return cpumask_first(nohz.cpu_mask);
-}
-#endif
-
-/*
- * This routine will try to nominate the ilb (idle load balancing)
- * owner among the cpus whose ticks are stopped. ilb owner will do the idle
- * load balancing on behalf of all those cpus. If all the cpus in the system
- * go into this tickless mode, then there will be no ilb owner (as there is
- * no need for one) and all the cpus will sleep till the next wakeup event
- * arrives...
- *
- * For the ilb owner, tick is not stopped. And this tick will be used
- * for idle load balancing. ilb owner will still be part of
- * nohz.cpu_mask..
- *
- * While stopping the tick, this cpu will become the ilb owner if there
- * is no other owner. And will be the owner till that cpu becomes busy
- * or if all cpus in the system stop their ticks at which point
- * there is no need for ilb owner.
- *
- * When the ilb owner becomes busy, it nominates another owner, during the
- * next busy scheduler_tick()
- */
-int select_nohz_load_balancer(int stop_tick)
-{
-        int cpu = smp_processor_id();
-
-        if (stop_tick) {
-                cpu_rq(cpu)->in_nohz_recently = 1;
-
-                if (!cpu_active(cpu)) {
-                        if (atomic_read(&nohz.load_balancer) != cpu)
-                                return 0;
-
-                        /*
-                         * If we are going offline and still the leader,
-                         * give up!
-                         */
-                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
-                                BUG();
-
-                        return 0;
-                }
-
-                cpumask_set_cpu(cpu, nohz.cpu_mask);
-
-                /* time for ilb owner also to sleep */
-                if (cpumask_weight(nohz.cpu_mask) == num_active_cpus()) {
-                        if (atomic_read(&nohz.load_balancer) == cpu)
-                                atomic_set(&nohz.load_balancer, -1);
-                        return 0;
-                }
-
-                if (atomic_read(&nohz.load_balancer) == -1) {
-                        /* make me the ilb owner */
-                        if (atomic_cmpxchg(&nohz.load_balancer, -1, cpu) == -1)
-                                return 1;
-                } else if (atomic_read(&nohz.load_balancer) == cpu) {
-                        int new_ilb;
-
-                        if (!(sched_smt_power_savings ||
-                                                sched_mc_power_savings))
-                                return 1;
-                        /*
-                         * Check to see if there is a more power-efficient
-                         * ilb.
-                         */
-                        new_ilb = find_new_ilb(cpu);
-                        if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
-                                atomic_set(&nohz.load_balancer, -1);
-                                resched_cpu(new_ilb);
-                                return 0;
-                        }
-                        return 1;
-                }
-        } else {
-                if (!cpumask_test_cpu(cpu, nohz.cpu_mask))
-                        return 0;
-
-                cpumask_clear_cpu(cpu, nohz.cpu_mask);
-
-                if (atomic_read(&nohz.load_balancer) == cpu)
-                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
-                                BUG();
-        }
-        return 0;
-}
-#endif
-
-static DEFINE_SPINLOCK(balancing);
-
-/*
- * It checks each scheduling domain to see if it is due to be balanced,
- * and initiates a balancing operation if so.
- *
- * Balancing parameters are set up in arch_init_sched_domains.
- */
-static void rebalance_domains(int cpu, enum cpu_idle_type idle)
-{
-        int balance = 1;
-        struct rq *rq = cpu_rq(cpu);
-        unsigned long interval;
-        struct sched_domain *sd;
-        /* Earliest time when we have to do rebalance again */
-        unsigned long next_balance = jiffies + 60*HZ;
-        int update_next_balance = 0;
-        int need_serialize;
-
-        for_each_domain(cpu, sd) {
-                if (!(sd->flags & SD_LOAD_BALANCE))
-                        continue;
-
-                interval = sd->balance_interval;
-                if (idle != CPU_IDLE)
-                        interval *= sd->busy_factor;
-
-                /* scale ms to jiffies */
-                interval = msecs_to_jiffies(interval);
-                if (unlikely(!interval))
-                        interval = 1;
-                if (interval > HZ*NR_CPUS/10)
-                        interval = HZ*NR_CPUS/10;
-
-                need_serialize = sd->flags & SD_SERIALIZE;
-
-                if (need_serialize) {
-                        if (!spin_trylock(&balancing))
-                                goto out;
-                }
-
-                if (time_after_eq(jiffies, sd->last_balance + interval)) {
-                        if (load_balance(cpu, rq, sd, idle, &balance)) {
-                                /*
-                                 * We've pulled tasks over so either we're no
-                                 * longer idle, or one of our SMT siblings is
-                                 * not idle.
-                                 */
-                                idle = CPU_NOT_IDLE;
-                        }
-                        sd->last_balance = jiffies;
-                }
-                if (need_serialize)
-                        spin_unlock(&balancing);
-out:
-                if (time_after(next_balance, sd->last_balance + interval)) {
-                        next_balance = sd->last_balance + interval;
-                        update_next_balance = 1;
-                }
-
-                /*
-                 * Stop the load balance at this level. There is another
-                 * CPU in our sched group which is doing load balancing more
-                 * actively.
-                 */
-                if (!balance)
-                        break;
-        }
-
-        /*
-         * next_balance will be updated only when there is a need.
-         * When the cpu is attached to null domain for ex, it will not be
-         * updated.
-         */
-        if (likely(update_next_balance))
-                rq->next_balance = next_balance;
-}
-
-/*
- * run_rebalance_domains is triggered when needed from the scheduler tick.
- * In CONFIG_NO_HZ case, the idle load balance owner will do the
- * rebalancing for all the cpus for whom scheduler ticks are stopped.
- */
-static void run_rebalance_domains(struct softirq_action *h)
-{
-        int this_cpu = smp_processor_id();
-        struct rq *this_rq = cpu_rq(this_cpu);
-        enum cpu_idle_type idle = this_rq->idle_at_tick ?
-                                                CPU_IDLE : CPU_NOT_IDLE;
-
-        rebalance_domains(this_cpu, idle);
-
-#ifdef CONFIG_NO_HZ
-        /*
-         * If this cpu is the owner for idle load balancing, then do the
-         * balancing on behalf of the other idle cpus whose ticks are
-         * stopped.
-         */
-        if (this_rq->idle_at_tick &&
-            atomic_read(&nohz.load_balancer) == this_cpu) {
-                struct rq *rq;
-                int balance_cpu;
-
-                for_each_cpu(balance_cpu, nohz.cpu_mask) {
-                        if (balance_cpu == this_cpu)
-                                continue;
-
-                        /*
-                         * If this cpu gets work to do, stop the load balancing
-                         * work being done for other cpus. Next load
-                         * balancing owner will pick it up.
-                         */
-                        if (need_resched())
-                                break;
-
-                        rebalance_domains(balance_cpu, CPU_IDLE);
-
-                        rq = cpu_rq(balance_cpu);
-                        if (time_after(this_rq->next_balance, rq->next_balance))
-                                this_rq->next_balance = rq->next_balance;
-                }
-        }
-#endif
-}
-
-static inline int on_null_domain(int cpu)
-{
-        return !rcu_dereference_sched(cpu_rq(cpu)->sd);
-}
-
-/*
- * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
- *
- * In case of CONFIG_NO_HZ, this is the place where we nominate a new
- * idle load balancing owner or decide to stop the periodic load balancing,
- * if the whole system is idle.
- */
-static inline void trigger_load_balance(struct rq *rq, int cpu)
-{
-#ifdef CONFIG_NO_HZ
-        /*
-         * If we were in the nohz mode recently and busy at the current
-         * scheduler tick, then check if we need to nominate new idle
-         * load balancer.
-         */
-        if (rq->in_nohz_recently && !rq->idle_at_tick) {
-                rq->in_nohz_recently = 0;
-
-                if (atomic_read(&nohz.load_balancer) == cpu) {
-                        cpumask_clear_cpu(cpu, nohz.cpu_mask);
-                        atomic_set(&nohz.load_balancer, -1);
-                }
-
-                if (atomic_read(&nohz.load_balancer) == -1) {
-                        int ilb = find_new_ilb(cpu);
-
-                        if (ilb < nr_cpu_ids)
-                                resched_cpu(ilb);
-                }
-        }
-
-        /*
-         * If this cpu is idle and doing idle load balancing for all the
-         * cpus with ticks stopped, is it time for that to stop?
-         */
-        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) == cpu &&
-            cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
-                resched_cpu(cpu);
-                return;
-        }
-
-        /*
-         * If this cpu is idle and the idle load balancing is done by
-         * someone else, then no need raise the SCHED_SOFTIRQ
-         */
-        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) != cpu &&
-            cpumask_test_cpu(cpu, nohz.cpu_mask))
-                return;
-#endif
-        /* Don't need to rebalance while attached to NULL domain */
-        if (time_after_eq(jiffies, rq->next_balance) &&
-            likely(!on_null_domain(cpu)))
-                raise_softirq(SCHED_SOFTIRQ);
-}
-
-#else   /* CONFIG_SMP */
-
-/*
- * on UP we do not need to balance between CPUs:
- */
-static inline void idle_balance(int cpu, struct rq *rq)
-{
-}
-
 #endif
 
 DEFINE_PER_CPU(struct kernel_stat, kstat);
@@ -6114,7 +4260,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
         unsigned long flags;
         int oldprio, on_rq, running;
         struct rq *rq;
-        const struct sched_class *prev_class = p->sched_class;
+        const struct sched_class *prev_class;
 
         BUG_ON(prio < 0 || prio > MAX_PRIO);
 
@@ -6122,6 +4268,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
         update_rq_clock(rq);
 
         oldprio = p->prio;
+        prev_class = p->sched_class;
         on_rq = p->se.on_rq;
         running = task_current(rq, p);
         if (on_rq)
@@ -6139,7 +4286,7 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
         if (running)
                 p->sched_class->set_curr_task(rq);
         if (on_rq) {
-                enqueue_task(rq, p, 0);
+                enqueue_task(rq, p, 0, oldprio < prio);
 
                 check_class_changed(rq, p, prev_class, oldprio, running);
         }
@@ -6183,7 +4330,7 @@ void set_user_nice(struct task_struct *p, long nice)
         delta = p->prio - old_prio;
 
         if (on_rq) {
-                enqueue_task(rq, p, 0);
+                enqueue_task(rq, p, 0, false);
                 /*
                  * If the task increased its priority or is running and
                  * lowered its priority, then reschedule its CPU:
@@ -6341,7 +4488,7 @@ static int __sched_setscheduler(struct task_struct *p, int policy,
 {
         int retval, oldprio, oldpolicy = -1, on_rq, running;
         unsigned long flags;
-        const struct sched_class *prev_class = p->sched_class;
+        const struct sched_class *prev_class;
         struct rq *rq;
         int reset_on_fork;
 
@@ -6455,6 +4602,7 @@ recheck:
         p->sched_reset_on_fork = reset_on_fork;
 
         oldprio = p->prio;
+        prev_class = p->sched_class;
         __setscheduler(rq, p, policy, param->sched_priority);
 
         if (running)
@@ -9493,7 +7641,6 @@ static void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
         tg->rt_rq[cpu] = rt_rq;
         init_rt_rq(rt_rq, rq);
         rt_rq->tg = tg;
-        rt_rq->rt_se = rt_se;
         rt_rq->rt_runtime = tg->rt_bandwidth.rt_runtime;
         if (add)
                 list_add(&rt_rq->leaf_rt_rq_list, &rq->leaf_rt_rq_list);
@@ -9524,9 +7671,6 @@ void __init sched_init(void)
 #ifdef CONFIG_RT_GROUP_SCHED
         alloc_size += 2 * nr_cpu_ids * sizeof(void **);
 #endif
-#ifdef CONFIG_USER_SCHED
-        alloc_size *= 2;
-#endif
 #ifdef CONFIG_CPUMASK_OFFSTACK
         alloc_size += num_possible_cpus() * cpumask_size();
 #endif
@@ -9540,13 +7684,6 @@ void __init sched_init(void)
                 init_task_group.cfs_rq = (struct cfs_rq **)ptr;
                 ptr += nr_cpu_ids * sizeof(void **);
 
-#ifdef CONFIG_USER_SCHED
-                root_task_group.se = (struct sched_entity **)ptr;
-                ptr += nr_cpu_ids * sizeof(void **);
-
-                root_task_group.cfs_rq = (struct cfs_rq **)ptr;
-                ptr += nr_cpu_ids * sizeof(void **);
-#endif /* CONFIG_USER_SCHED */
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 #ifdef CONFIG_RT_GROUP_SCHED
                 init_task_group.rt_se = (struct sched_rt_entity **)ptr;
@@ -9555,13 +7692,6 @@ void __init sched_init(void)
                 init_task_group.rt_rq = (struct rt_rq **)ptr;
                 ptr += nr_cpu_ids * sizeof(void **);
 
-#ifdef CONFIG_USER_SCHED
-                root_task_group.rt_se = (struct sched_rt_entity **)ptr;
-                ptr += nr_cpu_ids * sizeof(void **);
-
-                root_task_group.rt_rq = (struct rt_rq **)ptr;
-                ptr += nr_cpu_ids * sizeof(void **);
-#endif /* CONFIG_USER_SCHED */
 #endif /* CONFIG_RT_GROUP_SCHED */
 #ifdef CONFIG_CPUMASK_OFFSTACK
                 for_each_possible_cpu(i) {
@@ -9581,22 +7711,13 @@ void __init sched_init(void)
 #ifdef CONFIG_RT_GROUP_SCHED
         init_rt_bandwidth(&init_task_group.rt_bandwidth,
                         global_rt_period(), global_rt_runtime());
-#ifdef CONFIG_USER_SCHED
-        init_rt_bandwidth(&root_task_group.rt_bandwidth,
-                        global_rt_period(), RUNTIME_INF);
-#endif /* CONFIG_USER_SCHED */
 #endif /* CONFIG_RT_GROUP_SCHED */
 
-#ifdef CONFIG_GROUP_SCHED
+#ifdef CONFIG_CGROUP_SCHED
         list_add(&init_task_group.list, &task_groups);
         INIT_LIST_HEAD(&init_task_group.children);
 
-#ifdef CONFIG_USER_SCHED
-        INIT_LIST_HEAD(&root_task_group.children);
-        init_task_group.parent = &root_task_group;
-        list_add(&init_task_group.siblings, &root_task_group.children);
-#endif /* CONFIG_USER_SCHED */
-#endif /* CONFIG_GROUP_SCHED */
+#endif /* CONFIG_CGROUP_SCHED */
 
 #if defined CONFIG_FAIR_GROUP_SCHED && defined CONFIG_SMP
         update_shares_data = __alloc_percpu(nr_cpu_ids * sizeof(unsigned long),
@@ -9636,25 +7757,6 @@ void __init sched_init(void)
                  * directly in rq->cfs (i.e init_task_group->se[] = NULL).
                  */
                 init_tg_cfs_entry(&init_task_group, &rq->cfs, NULL, i, 1, NULL);
-#elif defined CONFIG_USER_SCHED
-                root_task_group.shares = NICE_0_LOAD;
-                init_tg_cfs_entry(&root_task_group, &rq->cfs, NULL, i, 0, NULL);
-                /*
-                 * In case of task-groups formed thr' the user id of tasks,
-                 * init_task_group represents tasks belonging to root user.
-                 * Hence it forms a sibling of all subsequent groups formed.
-                 * In this case, init_task_group gets only a fraction of overall
-                 * system cpu resource, based on the weight assigned to root
-                 * user's cpu share (INIT_TASK_GROUP_LOAD). This is accomplished
-                 * by letting tasks of init_task_group sit in a separate cfs_rq
-                 * (init_tg_cfs_rq) and having one entity represent this group of
-                 * tasks in rq->cfs (i.e init_task_group->se[] != NULL).
-                 */
-                init_tg_cfs_entry(&init_task_group,
-                                &per_cpu(init_tg_cfs_rq, i),
-                                &per_cpu(init_sched_entity, i), i, 1,
-                                root_task_group.se[i]);
-
 #endif
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
@@ -9663,12 +7765,6 @@ void __init sched_init(void)
                 INIT_LIST_HEAD(&rq->leaf_rt_rq_list);
 #ifdef CONFIG_CGROUP_SCHED
                 init_tg_rt_entry(&init_task_group, &rq->rt, NULL, i, 1, NULL);
-#elif defined CONFIG_USER_SCHED
-                init_tg_rt_entry(&root_task_group, &rq->rt, NULL, i, 0, NULL);
-                init_tg_rt_entry(&init_task_group,
-                                &per_cpu(init_rt_rq_var, i),
-                                &per_cpu(init_sched_rt_entity, i), i, 1,
-                                root_task_group.rt_se[i]);
 #endif
 #endif
 
@@ -9753,7 +7849,7 @@ static inline int preempt_count_equals(int preempt_offset)
         return (nested == PREEMPT_INATOMIC_BASE + preempt_offset);
 }
 
-void __might_sleep(char *file, int line, int preempt_offset)
+void __might_sleep(const char *file, int line, int preempt_offset)
 {
 #ifdef in_atomic
         static unsigned long prev_jiffy;        /* ratelimiting */
@@ -10064,7 +8160,7 @@ static inline void unregister_rt_sched_group(struct task_group *tg, int cpu)
 }
 #endif /* CONFIG_RT_GROUP_SCHED */
 
-#ifdef CONFIG_GROUP_SCHED
+#ifdef CONFIG_CGROUP_SCHED
 static void free_sched_group(struct task_group *tg)
 {
         free_fair_sched_group(tg);
@@ -10169,11 +8265,11 @@ void sched_move_task(struct task_struct *tsk)
         if (unlikely(running))
                 tsk->sched_class->set_curr_task(rq);
         if (on_rq)
-                enqueue_task(rq, tsk, 0);
+                enqueue_task(rq, tsk, 0, false);
 
         task_rq_unlock(rq, &flags);
 }
-#endif /* CONFIG_GROUP_SCHED */
+#endif /* CONFIG_CGROUP_SCHED */
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
 static void __set_se_shares(struct sched_entity *se, unsigned long shares)
@@ -10315,13 +8411,6 @@ static int tg_schedulable(struct task_group *tg, void *data)
                 runtime = d->rt_runtime;
         }
 
-#ifdef CONFIG_USER_SCHED
-        if (tg == &root_task_group) {
-                period = global_rt_period();
-                runtime = global_rt_runtime();
-        }
-#endif
-
         /*
          * Cannot have more runtime than the period.
          */
@@ -10941,12 +9030,30 @@ static void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 }
 
 /*
+ * When CONFIG_VIRT_CPU_ACCOUNTING is enabled one jiffy can be very large
+ * in cputime_t units. As a result, cpuacct_update_stats calls
+ * percpu_counter_add with values large enough to always overflow the
+ * per cpu batch limit causing bad SMP scalability.
+ *
+ * To fix this we scale percpu_counter_batch by cputime_one_jiffy so we
+ * batch the same amount of time with CONFIG_VIRT_CPU_ACCOUNTING disabled
+ * and enabled. We cap it at INT_MAX which is the largest allowed batch value.
+ */
+#ifdef CONFIG_SMP
+#define CPUACCT_BATCH   \
+        min_t(long, percpu_counter_batch * cputime_one_jiffy, INT_MAX)
+#else
+#define CPUACCT_BATCH   0
+#endif
+
+/*
  * Charge the system/user time to the task's accounting group.
  */
 static void cpuacct_update_stats(struct task_struct *tsk,
                 enum cpuacct_stat_index idx, cputime_t val)
 {
         struct cpuacct *ca;
+        int batch = CPUACCT_BATCH;
 
         if (unlikely(!cpuacct_subsys.active))
                 return;
@@ -10955,7 +9062,7 @@ static void cpuacct_update_stats(struct task_struct *tsk,
         ca = task_ca(tsk);
 
         do {
-                percpu_counter_add(&ca->cpustat[idx], val);
+                __percpu_counter_add(&ca->cpustat[idx], val, batch);
                 ca = ca->parent;
         } while (ca);
         rcu_read_unlock();
diff --git a/kernel/sched_cpupri.c b/kernel/sched_cpupri.c
index 597b33099dfa..eeb3506c4834 100644
--- a/kernel/sched_cpupri.c
+++ b/kernel/sched_cpupri.c
@@ -47,9 +47,7 @@ static int convert_prio(int prio)
 }
 
 #define for_each_cpupri_active(array, idx)                    \
-  for (idx = find_first_bit(array, CPUPRI_NR_PRIORITIES);     \
-       idx < CPUPRI_NR_PRIORITIES;                            \
-       idx = find_next_bit(array, CPUPRI_NR_PRIORITIES, idx+1))
+        for_each_bit(idx, array, CPUPRI_NR_PRIORITIES)
 
 /**
  * cpupri_find - find the best (lowest-pri) CPU in the system
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8fe7ee81c552..3e1fd96c6cf9 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1053,7 +1053,8 @@ static inline void hrtick_update(struct rq *rq)
  * increased. Here we update the fair scheduling stats and
  * then put the task into the rbtree:
  */
-static void enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup)
+static void
+enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 {
         struct cfs_rq *cfs_rq;
         struct sched_entity *se = &p->se;
@@ -1815,57 +1816,164 @@ static void put_prev_task_fair(struct rq *rq, struct task_struct *prev)
  */
 
 /*
- * Load-balancing iterator. Note: while the runqueue stays locked
- * during the whole iteration, the current task might be
- * dequeued so the iterator has to be dequeue-safe. Here we
- * achieve that by always pre-iterating before returning
- * the current task:
+ * pull_task - move a task from a remote runqueue to the local runqueue.
+ * Both runqueues must be locked.
  */
-static struct task_struct *
-__load_balance_iterator(struct cfs_rq *cfs_rq, struct list_head *next)
+static void pull_task(struct rq *src_rq, struct task_struct *p,
+                      struct rq *this_rq, int this_cpu)
 {
-        struct task_struct *p = NULL;
-        struct sched_entity *se;
+        deactivate_task(src_rq, p, 0);
+        set_task_cpu(p, this_cpu);
+        activate_task(this_rq, p, 0);
+        check_preempt_curr(this_rq, p, 0);
+}
 
-        if (next == &cfs_rq->tasks)
-                return NULL;
+/*
+ * can_migrate_task - may task p from runqueue rq be migrated to this_cpu?
+ */
+static
+int can_migrate_task(struct task_struct *p, struct rq *rq, int this_cpu,
+                     struct sched_domain *sd, enum cpu_idle_type idle,
+                     int *all_pinned)
+{
+        int tsk_cache_hot = 0;
+        /*
+         * We do not migrate tasks that are:
+         * 1) running (obviously), or
+         * 2) cannot be migrated to this CPU due to cpus_allowed, or
+         * 3) are cache-hot on their current CPU.
+         */
+        if (!cpumask_test_cpu(this_cpu, &p->cpus_allowed)) {
+                schedstat_inc(p, se.nr_failed_migrations_affine);
+                return 0;
+        }
+        *all_pinned = 0;
 
-        se = list_entry(next, struct sched_entity, group_node);
-        p = task_of(se);
-        cfs_rq->balance_iterator = next->next;
+        if (task_running(rq, p)) {
+                schedstat_inc(p, se.nr_failed_migrations_running);
+                return 0;
+        }
 
-        return p;
-}
+        /*
+         * Aggressive migration if:
+         * 1) task is cache cold, or
+         * 2) too many balance attempts have failed.
+         */
 
-static struct task_struct *load_balance_start_fair(void *arg)
-{
-        struct cfs_rq *cfs_rq = arg;
+        tsk_cache_hot = task_hot(p, rq->clock, sd);
+        if (!tsk_cache_hot ||
+                sd->nr_balance_failed > sd->cache_nice_tries) {
+#ifdef CONFIG_SCHEDSTATS
+                if (tsk_cache_hot) {
+                        schedstat_inc(sd, lb_hot_gained[idle]);
+                        schedstat_inc(p, se.nr_forced_migrations);
+                }
+#endif
+                return 1;
+        }
 
-        return __load_balance_iterator(cfs_rq, cfs_rq->tasks.next);
+        if (tsk_cache_hot) {
+                schedstat_inc(p, se.nr_failed_migrations_hot);
+                return 0;
+        }
+        return 1;
 }
 
-static struct task_struct *load_balance_next_fair(void *arg)
+/*
+ * move_one_task tries to move exactly one task from busiest to this_rq, as
+ * part of active balancing operations within "domain".
+ * Returns 1 if successful and 0 otherwise.
+ *
+ * Called with both runqueues locked.
+ */
+static int
+move_one_task(struct rq *this_rq, int this_cpu, struct rq *busiest,
+              struct sched_domain *sd, enum cpu_idle_type idle)
 {
-        struct cfs_rq *cfs_rq = arg;
+        struct task_struct *p, *n;
+        struct cfs_rq *cfs_rq;
+        int pinned = 0;
+
+        for_each_leaf_cfs_rq(busiest, cfs_rq) {
+                list_for_each_entry_safe(p, n, &cfs_rq->tasks, se.group_node) {
+
+                        if (!can_migrate_task(p, busiest, this_cpu,
+                                                sd, idle, &pinned))
+                                continue;
 
-        return __load_balance_iterator(cfs_rq, cfs_rq->balance_iterator);
+                        pull_task(busiest, p, this_rq, this_cpu);
+                        /*
+                         * Right now, this is only the second place pull_task()
+                         * is called, so we can safely collect pull_task()
+                         * stats here rather than inside pull_task().
+                         */
+                        schedstat_inc(sd, lb_gained[idle]);
+                        return 1;
+                }
+        }
+
+        return 0;
 }
 
 static unsigned long
-__load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                unsigned long max_load_move, struct sched_domain *sd,
-                enum cpu_idle_type idle, int *all_pinned, int *this_best_prio,
-                struct cfs_rq *cfs_rq)
+balance_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
+              unsigned long max_load_move, struct sched_domain *sd,
+              enum cpu_idle_type idle, int *all_pinned,
+              int *this_best_prio, struct cfs_rq *busiest_cfs_rq)
 {
-        struct rq_iterator cfs_rq_iterator;
+        int loops = 0, pulled = 0, pinned = 0;
+        long rem_load_move = max_load_move;
+        struct task_struct *p, *n;
 
-        cfs_rq_iterator.start = load_balance_start_fair;
-        cfs_rq_iterator.next = load_balance_next_fair;
-        cfs_rq_iterator.arg = cfs_rq;
+        if (max_load_move == 0)
+                goto out;
 
-        return balance_tasks(this_rq, this_cpu, busiest,
-                        max_load_move, sd, idle, all_pinned,
-                        this_best_prio, &cfs_rq_iterator);
+        pinned = 1;
+
+        list_for_each_entry_safe(p, n, &busiest_cfs_rq->tasks, se.group_node) {
+                if (loops++ > sysctl_sched_nr_migrate)
+                        break;
+
+                if ((p->se.load.weight >> 1) > rem_load_move ||
+                    !can_migrate_task(p, busiest, this_cpu, sd, idle, &pinned))
+                        continue;
+
+                pull_task(busiest, p, this_rq, this_cpu);
+                pulled++;
+                rem_load_move -= p->se.load.weight;
+
+#ifdef CONFIG_PREEMPT
+                /*
+                 * NEWIDLE balancing is a source of latency, so preemptible
+                 * kernels will stop after the first task is pulled to minimize
+                 * the critical section.
+                 */
+                if (idle == CPU_NEWLY_IDLE)
+                        break;
+#endif
+
+                /*
+                 * We only want to steal up to the prescribed amount of
+                 * weighted load.
+                 */
+                if (rem_load_move <= 0)
+                        break;
+
+                if (p->prio < *this_best_prio)
+                        *this_best_prio = p->prio;
+        }
+out:
+        /*
+         * Right now, this is one of only two places pull_task() is called,
+         * so we can safely collect pull_task() stats here rather than
+         * inside pull_task().
+         */
+        schedstat_add(sd, lb_gained[idle], pulled);
+
+        if (all_pinned)
+                *all_pinned = pinned;
+
+        return max_load_move - rem_load_move;
 }
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
@@ -1897,9 +2005,9 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
                 rem_load = (u64)rem_load_move * busiest_weight;
                 rem_load = div_u64(rem_load, busiest_h_load + 1);
 
-                moved_load = __load_balance_fair(this_rq, this_cpu, busiest,
+                moved_load = balance_tasks(this_rq, this_cpu, busiest,
                                 rem_load, sd, idle, all_pinned, this_best_prio,
-                                tg->cfs_rq[busiest_cpu]);
+                                busiest_cfs_rq);
 
                 if (!moved_load)
                         continue;
@@ -1922,35 +2030,1509 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
                   struct sched_domain *sd, enum cpu_idle_type idle,
                   int *all_pinned, int *this_best_prio)
 {
-        return __load_balance_fair(this_rq, this_cpu, busiest,
+        return balance_tasks(this_rq, this_cpu, busiest,
                         max_load_move, sd, idle, all_pinned,
                         this_best_prio, &busiest->cfs);
 }
 #endif
 
-static int
-move_one_task_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                   struct sched_domain *sd, enum cpu_idle_type idle)
+/*
+ * move_tasks tries to move up to max_load_move weighted load from busiest to
+ * this_rq, as part of a balancing operation within domain "sd".
+ * Returns 1 if successful and 0 otherwise.
+ *
+ * Called with both runqueues locked.
+ */
+static int move_tasks(struct rq *this_rq, int this_cpu, struct rq *busiest,
+                      unsigned long max_load_move,
+                      struct sched_domain *sd, enum cpu_idle_type idle,
+                      int *all_pinned)
 {
-        struct cfs_rq *busy_cfs_rq;
-        struct rq_iterator cfs_rq_iterator;
+        unsigned long total_load_moved = 0, load_moved;
+        int this_best_prio = this_rq->curr->prio;
 
-        cfs_rq_iterator.start = load_balance_start_fair;
-        cfs_rq_iterator.next = load_balance_next_fair;
+        do {
+                load_moved = load_balance_fair(this_rq, this_cpu, busiest,
+                                max_load_move - total_load_moved,
+                                sd, idle, all_pinned, &this_best_prio);
 
-        for_each_leaf_cfs_rq(busiest, busy_cfs_rq) {
+                total_load_moved += load_moved;
+
+#ifdef CONFIG_PREEMPT
                 /*
-                 * pass busy_cfs_rq argument into
-                 * load_balance_[start|next]_fair iterators
+                 * NEWIDLE balancing is a source of latency, so preemptible
+                 * kernels will stop after the first task is pulled to minimize
+                 * the critical section.
                  */
-                cfs_rq_iterator.arg = busy_cfs_rq;
-                if (iter_move_one_task(this_rq, this_cpu, busiest, sd, idle,
-                                       &cfs_rq_iterator))
-                    return 1;
+                if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
+                        break;
+
+                if (raw_spin_is_contended(&this_rq->lock) ||
+                                raw_spin_is_contended(&busiest->lock))
+                        break;
+#endif
+        } while (load_moved && max_load_move > total_load_moved);
+
+        return total_load_moved > 0;
+}
+
+/********** Helpers for find_busiest_group ************************/
+/*
+ * sd_lb_stats - Structure to store the statistics of a sched_domain
+ *              during load balancing.
+ */
+struct sd_lb_stats {
+        struct sched_group *busiest; /* Busiest group in this sd */
+        struct sched_group *this;  /* Local group in this sd */
+        unsigned long total_load;  /* Total load of all groups in sd */
+        unsigned long total_pwr;   /*   Total power of all groups in sd */
+        unsigned long avg_load;    /* Average load across all groups in sd */
+
+        /** Statistics of this group */
+        unsigned long this_load;
+        unsigned long this_load_per_task;
+        unsigned long this_nr_running;
+
+        /* Statistics of the busiest group */
+        unsigned long max_load;
+        unsigned long busiest_load_per_task;
+        unsigned long busiest_nr_running;
+        unsigned long busiest_group_capacity;
+
+        int group_imb; /* Is there imbalance in this sd */
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+        int power_savings_balance; /* Is powersave balance needed for this sd */
+        struct sched_group *group_min; /* Least loaded group in sd */
+        struct sched_group *group_leader; /* Group which relieves group_min */
+        unsigned long min_load_per_task; /* load_per_task in group_min */
+        unsigned long leader_nr_running; /* Nr running of group_leader */
+        unsigned long min_nr_running; /* Nr running of group_min */
+#endif
+};
+
+/*
+ * sg_lb_stats - stats of a sched_group required for load_balancing
+ */
+struct sg_lb_stats {
+        unsigned long avg_load; /*Avg load across the CPUs of the group */
+        unsigned long group_load; /* Total load over the CPUs of the group */
+        unsigned long sum_nr_running; /* Nr tasks running in the group */
+        unsigned long sum_weighted_load; /* Weighted load of group's tasks */
+        unsigned long group_capacity;
+        int group_imb; /* Is there an imbalance in the group ? */
+};
+
+/**
+ * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
+ * @group: The group whose first cpu is to be returned.
+ */
+static inline unsigned int group_first_cpu(struct sched_group *group)
+{
+        return cpumask_first(sched_group_cpus(group));
+}
+
+/**
+ * get_sd_load_idx - Obtain the load index for a given sched domain.
+ * @sd: The sched_domain whose load_idx is to be obtained.
+ * @idle: The Idle status of the CPU for whose sd load_icx is obtained.
+ */
+static inline int get_sd_load_idx(struct sched_domain *sd,
+                                        enum cpu_idle_type idle)
+{
+        int load_idx;
+
+        switch (idle) {
+        case CPU_NOT_IDLE:
+                load_idx = sd->busy_idx;
+                break;
+
+        case CPU_NEWLY_IDLE:
+                load_idx = sd->newidle_idx;
+                break;
+        default:
+                load_idx = sd->idle_idx;
+                break;
         }
 
+        return load_idx;
+}
+
+
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+/**
+ * init_sd_power_savings_stats - Initialize power savings statistics for
+ * the given sched_domain, during load balancing.
+ *
+ * @sd: Sched domain whose power-savings statistics are to be initialized.
+ * @sds: Variable containing the statistics for sd.
+ * @idle: Idle status of the CPU at which we're performing load-balancing.
+ */
+static inline void init_sd_power_savings_stats(struct sched_domain *sd,
+        struct sd_lb_stats *sds, enum cpu_idle_type idle)
+{
+        /*
+         * Busy processors will not participate in power savings
+         * balance.
+         */
+        if (idle == CPU_NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
+                sds->power_savings_balance = 0;
+        else {
+                sds->power_savings_balance = 1;
+                sds->min_nr_running = ULONG_MAX;
+                sds->leader_nr_running = 0;
+        }
+}
+
+/**
+ * update_sd_power_savings_stats - Update the power saving stats for a
+ * sched_domain while performing load balancing.
+ *
+ * @group: sched_group belonging to the sched_domain under consideration.
+ * @sds: Variable containing the statistics of the sched_domain
+ * @local_group: Does group contain the CPU for which we're performing
+ *              load balancing ?
+ * @sgs: Variable containing the statistics of the group.
+ */
+static inline void update_sd_power_savings_stats(struct sched_group *group,
+        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
+{
+
+        if (!sds->power_savings_balance)
+                return;
+
+        /*
+         * If the local group is idle or completely loaded
+         * no need to do power savings balance at this domain
+         */
+        if (local_group && (sds->this_nr_running >= sgs->group_capacity ||
+                                !sds->this_nr_running))
+                sds->power_savings_balance = 0;
+
+        /*
+         * If a group is already running at full capacity or idle,
+         * don't include that group in power savings calculations
+         */
+        if (!sds->power_savings_balance ||
+                sgs->sum_nr_running >= sgs->group_capacity ||
+                !sgs->sum_nr_running)
+                return;
+
+        /*
+         * Calculate the group which has the least non-idle load.
+         * This is the group from where we need to pick up the load
+         * for saving power
+         */
+        if ((sgs->sum_nr_running < sds->min_nr_running) ||
+            (sgs->sum_nr_running == sds->min_nr_running &&
+             group_first_cpu(group) > group_first_cpu(sds->group_min))) {
+                sds->group_min = group;
+                sds->min_nr_running = sgs->sum_nr_running;
+                sds->min_load_per_task = sgs->sum_weighted_load /
+                                                sgs->sum_nr_running;
+        }
+
+        /*
+         * Calculate the group which is almost near its
+         * capacity but still has some space to pick up some load
+         * from other group and save more power
+         */
+        if (sgs->sum_nr_running + 1 > sgs->group_capacity)
+                return;
+
+        if (sgs->sum_nr_running > sds->leader_nr_running ||
+            (sgs->sum_nr_running == sds->leader_nr_running &&
+             group_first_cpu(group) < group_first_cpu(sds->group_leader))) {
+                sds->group_leader = group;
+                sds->leader_nr_running = sgs->sum_nr_running;
+        }
+}
+
+/**
+ * check_power_save_busiest_group - see if there is potential for some power-savings balance
+ * @sds: Variable containing the statistics of the sched_domain
+ *      under consideration.
+ * @this_cpu: Cpu at which we're currently performing load-balancing.
+ * @imbalance: Variable to store the imbalance.
+ *
+ * Description:
+ * Check if we have potential to perform some power-savings balance.
+ * If yes, set the busiest group to be the least loaded group in the
+ * sched_domain, so that it's CPUs can be put to idle.
+ *
+ * Returns 1 if there is potential to perform power-savings balance.
+ * Else returns 0.
+ */
+static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
+                                        int this_cpu, unsigned long *imbalance)
+{
+        if (!sds->power_savings_balance)
+                return 0;
+
+        if (sds->this != sds->group_leader ||
+                        sds->group_leader == sds->group_min)
+                return 0;
+
+        *imbalance = sds->min_load_per_task;
+        sds->busiest = sds->group_min;
+
+        return 1;
+
+}
+#else /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+static inline void init_sd_power_savings_stats(struct sched_domain *sd,
+        struct sd_lb_stats *sds, enum cpu_idle_type idle)
+{
+        return;
+}
+
+static inline void update_sd_power_savings_stats(struct sched_group *group,
+        struct sd_lb_stats *sds, int local_group, struct sg_lb_stats *sgs)
+{
+        return;
+}
+
+static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
+                                        int this_cpu, unsigned long *imbalance)
+{
         return 0;
 }
+#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
+
+
+unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
+{
+        return SCHED_LOAD_SCALE;
+}
+
+unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)
+{
+        return default_scale_freq_power(sd, cpu);
+}
+
+unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu)
+{
+        unsigned long weight = cpumask_weight(sched_domain_span(sd));
+        unsigned long smt_gain = sd->smt_gain;
+
+        smt_gain /= weight;
+
+        return smt_gain;
+}
+
+unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)
+{
+        return default_scale_smt_power(sd, cpu);
+}
+
+unsigned long scale_rt_power(int cpu)
+{
+        struct rq *rq = cpu_rq(cpu);
+        u64 total, available;
+
+        sched_avg_update(rq);
+
+        total = sched_avg_period() + (rq->clock - rq->age_stamp);
+        available = total - rq->rt_avg;
+
+        if (unlikely((s64)total < SCHED_LOAD_SCALE))
+                total = SCHED_LOAD_SCALE;
+
+        total >>= SCHED_LOAD_SHIFT;
+
+        return div_u64(available, total);
+}
+
+static void update_cpu_power(struct sched_domain *sd, int cpu)
+{
+        unsigned long weight = cpumask_weight(sched_domain_span(sd));
+        unsigned long power = SCHED_LOAD_SCALE;
+        struct sched_group *sdg = sd->groups;
+
+        if (sched_feat(ARCH_POWER))
+                power *= arch_scale_freq_power(sd, cpu);
+        else
+                power *= default_scale_freq_power(sd, cpu);
+
+        power >>= SCHED_LOAD_SHIFT;
+
+        if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
+                if (sched_feat(ARCH_POWER))
+                        power *= arch_scale_smt_power(sd, cpu);
+                else
+                        power *= default_scale_smt_power(sd, cpu);
+
+                power >>= SCHED_LOAD_SHIFT;
+        }
+
+        power *= scale_rt_power(cpu);
+        power >>= SCHED_LOAD_SHIFT;
+
+        if (!power)
+                power = 1;
+
+        sdg->cpu_power = power;
+}
+
+static void update_group_power(struct sched_domain *sd, int cpu)
+{
+        struct sched_domain *child = sd->child;
+        struct sched_group *group, *sdg = sd->groups;
+        unsigned long power;
+
+        if (!child) {
+                update_cpu_power(sd, cpu);
+                return;
+        }
+
+        power = 0;
+
+        group = child->groups;
+        do {
+                power += group->cpu_power;
+                group = group->next;
+        } while (group != child->groups);
+
+        sdg->cpu_power = power;
+}
+
+/**
+ * update_sg_lb_stats - Update sched_group's statistics for load balancing.
+ * @sd: The sched_domain whose statistics are to be updated.
+ * @group: sched_group whose statistics are to be updated.
+ * @this_cpu: Cpu for which load balance is currently performed.
+ * @idle: Idle status of this_cpu
+ * @load_idx: Load index of sched_domain of this_cpu for load calc.
+ * @sd_idle: Idle status of the sched_domain containing group.
+ * @local_group: Does group contain this_cpu.
+ * @cpus: Set of cpus considered for load balancing.
+ * @balance: Should we balance.
+ * @sgs: variable to hold the statistics for this group.
+ */
+static inline void update_sg_lb_stats(struct sched_domain *sd,
+                        struct sched_group *group, int this_cpu,
+                        enum cpu_idle_type idle, int load_idx, int *sd_idle,
+                        int local_group, const struct cpumask *cpus,
+                        int *balance, struct sg_lb_stats *sgs)
+{
+        unsigned long load, max_cpu_load, min_cpu_load;
+        int i;
+        unsigned int balance_cpu = -1, first_idle_cpu = 0;
+        unsigned long avg_load_per_task = 0;
+
+        if (local_group)
+                balance_cpu = group_first_cpu(group);
+
+        /* Tally up the load of all CPUs in the group */
+        max_cpu_load = 0;
+        min_cpu_load = ~0UL;
+
+        for_each_cpu_and(i, sched_group_cpus(group), cpus) {
+                struct rq *rq = cpu_rq(i);
+
+                if (*sd_idle && rq->nr_running)
+                        *sd_idle = 0;
+
+                /* Bias balancing toward cpus of our domain */
+                if (local_group) {
+                        if (idle_cpu(i) && !first_idle_cpu) {
+                                first_idle_cpu = 1;
+                                balance_cpu = i;
+                        }
+
+                        load = target_load(i, load_idx);
+                } else {
+                        load = source_load(i, load_idx);
+                        if (load > max_cpu_load)
+                                max_cpu_load = load;
+                        if (min_cpu_load > load)
+                                min_cpu_load = load;
+                }
+
+                sgs->group_load += load;
+                sgs->sum_nr_running += rq->nr_running;
+                sgs->sum_weighted_load += weighted_cpuload(i);
+
+        }
+
+        /*
+         * First idle cpu or the first cpu(busiest) in this sched group
+         * is eligible for doing load balancing at this and above
+         * domains. In the newly idle case, we will allow all the cpu's
+         * to do the newly idle load balance.
+         */
+        if (idle != CPU_NEWLY_IDLE && local_group &&
+            balance_cpu != this_cpu) {
+                *balance = 0;
+                return;
+        }
+
+        update_group_power(sd, this_cpu);
+
+        /* Adjust by relative CPU power of the group */
+        sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
+
+        /*
+         * Consider the group unbalanced when the imbalance is larger
+         * than the average weight of two tasks.
+         *
+         * APZ: with cgroup the avg task weight can vary wildly and
+         *      might not be a suitable number - should we keep a
+         *      normalized nr_running number somewhere that negates
+         *      the hierarchy?
+         */
+        if (sgs->sum_nr_running)
+                avg_load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;
+
+        if ((max_cpu_load - min_cpu_load) > 2*avg_load_per_task)
+                sgs->group_imb = 1;
+
+        sgs->group_capacity =
+                DIV_ROUND_CLOSEST(group->cpu_power, SCHED_LOAD_SCALE);
+}
+
+/**
+ * update_sd_lb_stats - Update sched_group's statistics for load balancing.
+ * @sd: sched_domain whose statistics are to be updated.
+ * @this_cpu: Cpu for which load balance is currently performed.
+ * @idle: Idle status of this_cpu
+ * @sd_idle: Idle status of the sched_domain containing group.
+ * @cpus: Set of cpus considered for load balancing.
+ * @balance: Should we balance.
+ * @sds: variable to hold the statistics for this sched_domain.
+ */
+static inline void update_sd_lb_stats(struct sched_domain *sd, int this_cpu,
+                        enum cpu_idle_type idle, int *sd_idle,
+                        const struct cpumask *cpus, int *balance,
+                        struct sd_lb_stats *sds)
+{
+        struct sched_domain *child = sd->child;
+        struct sched_group *group = sd->groups;
+        struct sg_lb_stats sgs;
+        int load_idx, prefer_sibling = 0;
+
+        if (child && child->flags & SD_PREFER_SIBLING)
+                prefer_sibling = 1;
+
+        init_sd_power_savings_stats(sd, sds, idle);
+        load_idx = get_sd_load_idx(sd, idle);
+
+        do {
+                int local_group;
+
+                local_group = cpumask_test_cpu(this_cpu,
+                                               sched_group_cpus(group));
+                memset(&sgs, 0, sizeof(sgs));
+                update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
+                                local_group, cpus, balance, &sgs);
+
+                if (local_group && !(*balance))
+                        return;
+
+                sds->total_load += sgs.group_load;
+                sds->total_pwr += group->cpu_power;
+
+                /*
+                 * In case the child domain prefers tasks go to siblings
+                 * first, lower the group capacity to one so that we'll try
+                 * and move all the excess tasks away.
+                 */
+                if (prefer_sibling)
+                        sgs.group_capacity = min(sgs.group_capacity, 1UL);
+
+                if (local_group) {
+                        sds->this_load = sgs.avg_load;
+                        sds->this = group;
+                        sds->this_nr_running = sgs.sum_nr_running;
+                        sds->this_load_per_task = sgs.sum_weighted_load;
+                } else if (sgs.avg_load > sds->max_load &&
+                           (sgs.sum_nr_running > sgs.group_capacity ||
+                                sgs.group_imb)) {
+                        sds->max_load = sgs.avg_load;
+                        sds->busiest = group;
+                        sds->busiest_nr_running = sgs.sum_nr_running;
+                        sds->busiest_group_capacity = sgs.group_capacity;
+                        sds->busiest_load_per_task = sgs.sum_weighted_load;
+                        sds->group_imb = sgs.group_imb;
+                }
+
+                update_sd_power_savings_stats(group, sds, local_group, &sgs);
+                group = group->next;
+        } while (group != sd->groups);
+}
+
+/**
+ * fix_small_imbalance - Calculate the minor imbalance that exists
+ *                      amongst the groups of a sched_domain, during
+ *                      load balancing.
+ * @sds: Statistics of the sched_domain whose imbalance is to be calculated.
+ * @this_cpu: The cpu at whose sched_domain we're performing load-balance.
+ * @imbalance: Variable to store the imbalance.
+ */
+static inline void fix_small_imbalance(struct sd_lb_stats *sds,
+                                int this_cpu, unsigned long *imbalance)
+{
+        unsigned long tmp, pwr_now = 0, pwr_move = 0;
+        unsigned int imbn = 2;
+        unsigned long scaled_busy_load_per_task;
+
+        if (sds->this_nr_running) {
+                sds->this_load_per_task /= sds->this_nr_running;
+                if (sds->busiest_load_per_task >
+                                sds->this_load_per_task)
+                        imbn = 1;
+        } else
+                sds->this_load_per_task =
+                        cpu_avg_load_per_task(this_cpu);
+
+        scaled_busy_load_per_task = sds->busiest_load_per_task
+                                                 * SCHED_LOAD_SCALE;
+        scaled_busy_load_per_task /= sds->busiest->cpu_power;
+
+        if (sds->max_load - sds->this_load + scaled_busy_load_per_task >=
+                        (scaled_busy_load_per_task * imbn)) {
+                *imbalance = sds->busiest_load_per_task;
+                return;
+        }
+
+        /*
+         * OK, we don't have enough imbalance to justify moving tasks,
+         * however we may be able to increase total CPU power used by
+         * moving them.
+         */
+
+        pwr_now += sds->busiest->cpu_power *
+                        min(sds->busiest_load_per_task, sds->max_load);
+        pwr_now += sds->this->cpu_power *
+                        min(sds->this_load_per_task, sds->this_load);
+        pwr_now /= SCHED_LOAD_SCALE;
+
+        /* Amount of load we'd subtract */
+        tmp = (sds->busiest_load_per_task * SCHED_LOAD_SCALE) /
+                sds->busiest->cpu_power;
+        if (sds->max_load > tmp)
+                pwr_move += sds->busiest->cpu_power *
+                        min(sds->busiest_load_per_task, sds->max_load - tmp);
+
+        /* Amount of load we'd add */
+        if (sds->max_load * sds->busiest->cpu_power <
+                sds->busiest_load_per_task * SCHED_LOAD_SCALE)
+                tmp = (sds->max_load * sds->busiest->cpu_power) /
+                        sds->this->cpu_power;
+        else
+                tmp = (sds->busiest_load_per_task * SCHED_LOAD_SCALE) /
+                        sds->this->cpu_power;
+        pwr_move += sds->this->cpu_power *
+                        min(sds->this_load_per_task, sds->this_load + tmp);
+        pwr_move /= SCHED_LOAD_SCALE;
+
+        /* Move if we gain throughput */
+        if (pwr_move > pwr_now)
+                *imbalance = sds->busiest_load_per_task;
+}
+
+/**
+ * calculate_imbalance - Calculate the amount of imbalance present within the
+ *                       groups of a given sched_domain during load balance.
+ * @sds: statistics of the sched_domain whose imbalance is to be calculated.
+ * @this_cpu: Cpu for which currently load balance is being performed.
+ * @imbalance: The variable to store the imbalance.
+ */
+static inline void calculate_imbalance(struct sd_lb_stats *sds, int this_cpu,
+                unsigned long *imbalance)
+{
+        unsigned long max_pull, load_above_capacity = ~0UL;
+
+        sds->busiest_load_per_task /= sds->busiest_nr_running;
+        if (sds->group_imb) {
+                sds->busiest_load_per_task =
+                        min(sds->busiest_load_per_task, sds->avg_load);
+        }
+
+        /*
+         * In the presence of smp nice balancing, certain scenarios can have
+         * max load less than avg load(as we skip the groups at or below
+         * its cpu_power, while calculating max_load..)
+         */
+        if (sds->max_load < sds->avg_load) {
+                *imbalance = 0;
+                return fix_small_imbalance(sds, this_cpu, imbalance);
+        }
+
+        if (!sds->group_imb) {
+                /*
+                 * Don't want to pull so many tasks that a group would go idle.
+                 */
+                load_above_capacity = (sds->busiest_nr_running -
+                                                sds->busiest_group_capacity);
+
+                load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_LOAD_SCALE);
+
+                load_above_capacity /= sds->busiest->cpu_power;
+        }
+
+        /*
+         * We're trying to get all the cpus to the average_load, so we don't
+         * want to push ourselves above the average load, nor do we wish to
+         * reduce the max loaded cpu below the average load. At the same time,
+         * we also don't want to reduce the group load below the group capacity
+         * (so that we can implement power-savings policies etc). Thus we look
+         * for the minimum possible imbalance.
+         * Be careful of negative numbers as they'll appear as very large values
+         * with unsigned longs.
+         */
+        max_pull = min(sds->max_load - sds->avg_load, load_above_capacity);
+
+        /* How much load to actually move to equalise the imbalance */
+        *imbalance = min(max_pull * sds->busiest->cpu_power,
+                (sds->avg_load - sds->this_load) * sds->this->cpu_power)
+                        / SCHED_LOAD_SCALE;
+
+        /*
+         * if *imbalance is less than the average load per runnable task
+         * there is no gaurantee that any tasks will be moved so we'll have
+         * a think about bumping its value to force at least one task to be
+         * moved
+         */
+        if (*imbalance < sds->busiest_load_per_task)
+                return fix_small_imbalance(sds, this_cpu, imbalance);
+
+}
+/******* find_busiest_group() helpers end here *********************/
+
+/**
+ * find_busiest_group - Returns the busiest group within the sched_domain
+ * if there is an imbalance. If there isn't an imbalance, and
+ * the user has opted for power-savings, it returns a group whose
+ * CPUs can be put to idle by rebalancing those tasks elsewhere, if
+ * such a group exists.
+ *
+ * Also calculates the amount of weighted load which should be moved
+ * to restore balance.
+ *
+ * @sd: The sched_domain whose busiest group is to be returned.
+ * @this_cpu: The cpu for which load balancing is currently being performed.
+ * @imbalance: Variable which stores amount of weighted load which should
+ *              be moved to restore balance/put a group to idle.
+ * @idle: The idle status of this_cpu.
+ * @sd_idle: The idleness of sd
+ * @cpus: The set of CPUs under consideration for load-balancing.
+ * @balance: Pointer to a variable indicating if this_cpu
+ *      is the appropriate cpu to perform load balancing at this_level.
+ *
+ * Returns:     - the busiest group if imbalance exists.
+ *              - If no imbalance and user has opted for power-savings balance,
+ *                 return the least loaded group whose CPUs can be
+ *                 put to idle by rebalancing its tasks onto our group.
+ */
+static struct sched_group *
+find_busiest_group(struct sched_domain *sd, int this_cpu,
+                   unsigned long *imbalance, enum cpu_idle_type idle,
+                   int *sd_idle, const struct cpumask *cpus, int *balance)
+{
+        struct sd_lb_stats sds;
+
+        memset(&sds, 0, sizeof(sds));
+
+        /*
+         * Compute the various statistics relavent for load balancing at
+         * this level.
+         */
+        update_sd_lb_stats(sd, this_cpu, idle, sd_idle, cpus,
+                                        balance, &sds);
+
+        /* Cases where imbalance does not exist from POV of this_cpu */
+        /* 1) this_cpu is not the appropriate cpu to perform load balancing
+         *    at this level.
+         * 2) There is no busy sibling group to pull from.
+         * 3) This group is the busiest group.
+         * 4) This group is more busy than the avg busieness at this
+         *    sched_domain.
+         * 5) The imbalance is within the specified limit.
+         */
+        if (!(*balance))
+                goto ret;
+
+        if (!sds.busiest || sds.busiest_nr_running == 0)
+                goto out_balanced;
+
+        if (sds.this_load >= sds.max_load)
+                goto out_balanced;
+
+        sds.avg_load = (SCHED_LOAD_SCALE * sds.total_load) / sds.total_pwr;
+
+        if (sds.this_load >= sds.avg_load)
+                goto out_balanced;
+
+        if (100 * sds.max_load <= sd->imbalance_pct * sds.this_load)
+                goto out_balanced;
+
+        /* Looks like there is an imbalance. Compute it */
+        calculate_imbalance(&sds, this_cpu, imbalance);
+        return sds.busiest;
+
+out_balanced:
+        /*
+         * There is no obvious imbalance. But check if we can do some balancing
+         * to save power.
+         */
+        if (check_power_save_busiest_group(&sds, this_cpu, imbalance))
+                return sds.busiest;
+ret:
+        *imbalance = 0;
+        return NULL;
+}
+
+/*
+ * find_busiest_queue - find the busiest runqueue among the cpus in group.
+ */
+static struct rq *
+find_busiest_queue(struct sched_group *group, enum cpu_idle_type idle,
+                   unsigned long imbalance, const struct cpumask *cpus)
+{
+        struct rq *busiest = NULL, *rq;
+        unsigned long max_load = 0;
+        int i;
+
+        for_each_cpu(i, sched_group_cpus(group)) {
+                unsigned long power = power_of(i);
+                unsigned long capacity = DIV_ROUND_CLOSEST(power, SCHED_LOAD_SCALE);
+                unsigned long wl;
+
+                if (!cpumask_test_cpu(i, cpus))
+                        continue;
+
+                rq = cpu_rq(i);
+                wl = weighted_cpuload(i);
+
+                /*
+                 * When comparing with imbalance, use weighted_cpuload()
+                 * which is not scaled with the cpu power.
+                 */
+                if (capacity && rq->nr_running == 1 && wl > imbalance)
+                        continue;
+
+                /*
+                 * For the load comparisons with the other cpu's, consider
+                 * the weighted_cpuload() scaled with the cpu power, so that
+                 * the load can be moved away from the cpu that is potentially
+                 * running at a lower capacity.
+                 */
+                wl = (wl * SCHED_LOAD_SCALE) / power;
+
+                if (wl > max_load) {
+                        max_load = wl;
+                        busiest = rq;
+                }
+        }
+
+        return busiest;
+}
+
+/*
+ * Max backoff if we encounter pinned tasks. Pretty arbitrary value, but
+ * so long as it is large enough.
+ */
+#define MAX_PINNED_INTERVAL     512
+
+/* Working cpumask for load_balance and load_balance_newidle. */
+static DEFINE_PER_CPU(cpumask_var_t, load_balance_tmpmask);
+
+static int need_active_balance(struct sched_domain *sd, int sd_idle, int idle)
+{
+        if (idle == CPU_NEWLY_IDLE) {
+                /*
+                 * The only task running in a non-idle cpu can be moved to this
+                 * cpu in an attempt to completely freeup the other CPU
+                 * package.
+                 *
+                 * The package power saving logic comes from
+                 * find_busiest_group(). If there are no imbalance, then
+                 * f_b_g() will return NULL. However when sched_mc={1,2} then
+                 * f_b_g() will select a group from which a running task may be
+                 * pulled to this cpu in order to make the other package idle.
+                 * If there is no opportunity to make a package idle and if
+                 * there are no imbalance, then f_b_g() will return NULL and no
+                 * action will be taken in load_balance_newidle().
+                 *
+                 * Under normal task pull operation due to imbalance, there
+                 * will be more than one task in the source run queue and
+                 * move_tasks() will succeed.  ld_moved will be true and this
+                 * active balance code will not be triggered.
+                 */
+                if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
+                    !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
+                        return 0;
+
+                if (sched_mc_power_savings < POWERSAVINGS_BALANCE_WAKEUP)
+                        return 0;
+        }
+
+        return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2);
+}
+
+/*
+ * Check this_cpu to ensure it is balanced within domain. Attempt to move
+ * tasks if there is an imbalance.
+ */
+static int load_balance(int this_cpu, struct rq *this_rq,
+                        struct sched_domain *sd, enum cpu_idle_type idle,
+                        int *balance)
+{
+        int ld_moved, all_pinned = 0, active_balance = 0, sd_idle = 0;
+        struct sched_group *group;
+        unsigned long imbalance;
+        struct rq *busiest;
+        unsigned long flags;
+        struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
+
+        cpumask_copy(cpus, cpu_active_mask);
+
+        /*
+         * When power savings policy is enabled for the parent domain, idle
+         * sibling can pick up load irrespective of busy siblings. In this case,
+         * let the state of idle sibling percolate up as CPU_IDLE, instead of
+         * portraying it as CPU_NOT_IDLE.
+         */
+        if (idle != CPU_NOT_IDLE && sd->flags & SD_SHARE_CPUPOWER &&
+            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
+                sd_idle = 1;
+
+        schedstat_inc(sd, lb_count[idle]);
+
+redo:
+        update_shares(sd);
+        group = find_busiest_group(sd, this_cpu, &imbalance, idle, &sd_idle,
+                                   cpus, balance);
+
+        if (*balance == 0)
+                goto out_balanced;
+
+        if (!group) {
+                schedstat_inc(sd, lb_nobusyg[idle]);
+                goto out_balanced;
+        }
+
+        busiest = find_busiest_queue(group, idle, imbalance, cpus);
+        if (!busiest) {
+                schedstat_inc(sd, lb_nobusyq[idle]);
+                goto out_balanced;
+        }
+
+        BUG_ON(busiest == this_rq);
+
+        schedstat_add(sd, lb_imbalance[idle], imbalance);
+
+        ld_moved = 0;
+        if (busiest->nr_running > 1) {
+                /*
+                 * Attempt to move tasks. If find_busiest_group has found
+                 * an imbalance but busiest->nr_running <= 1, the group is
+                 * still unbalanced. ld_moved simply stays zero, so it is
+                 * correctly treated as an imbalance.
+                 */
+                local_irq_save(flags);
+                double_rq_lock(this_rq, busiest);
+                ld_moved = move_tasks(this_rq, this_cpu, busiest,
+                                      imbalance, sd, idle, &all_pinned);
+                double_rq_unlock(this_rq, busiest);
+                local_irq_restore(flags);
+
+                /*
+                 * some other cpu did the load balance for us.
+                 */
+                if (ld_moved && this_cpu != smp_processor_id())
+                        resched_cpu(this_cpu);
+
+                /* All tasks on this runqueue were pinned by CPU affinity */
+                if (unlikely(all_pinned)) {
+                        cpumask_clear_cpu(cpu_of(busiest), cpus);
+                        if (!cpumask_empty(cpus))
+                                goto redo;
+                        goto out_balanced;
+                }
+        }
+
+        if (!ld_moved) {
+                schedstat_inc(sd, lb_failed[idle]);
+                sd->nr_balance_failed++;
+
+                if (need_active_balance(sd, sd_idle, idle)) {
+                        raw_spin_lock_irqsave(&busiest->lock, flags);
+
+                        /* don't kick the migration_thread, if the curr
+                         * task on busiest cpu can't be moved to this_cpu
+                         */
+                        if (!cpumask_test_cpu(this_cpu,
+                                              &busiest->curr->cpus_allowed)) {
+                                raw_spin_unlock_irqrestore(&busiest->lock,
+                                                            flags);
+                                all_pinned = 1;
+                                goto out_one_pinned;
+                        }
+
+                        if (!busiest->active_balance) {
+                                busiest->active_balance = 1;
+                                busiest->push_cpu = this_cpu;
+                                active_balance = 1;
+                        }
+                        raw_spin_unlock_irqrestore(&busiest->lock, flags);
+                        if (active_balance)
+                                wake_up_process(busiest->migration_thread);
+
+                        /*
+                         * We've kicked active balancing, reset the failure
+                         * counter.
+                         */
+                        sd->nr_balance_failed = sd->cache_nice_tries+1;
+                }
+        } else
+                sd->nr_balance_failed = 0;
+
+        if (likely(!active_balance)) {
+                /* We were unbalanced, so reset the balancing interval */
+                sd->balance_interval = sd->min_interval;
+        } else {
+                /*
+                 * If we've begun active balancing, start to back off. This
+                 * case may not be covered by the all_pinned logic if there
+                 * is only 1 task on the busy runqueue (because we don't call
+                 * move_tasks).
+                 */
+                if (sd->balance_interval < sd->max_interval)
+                        sd->balance_interval *= 2;
+        }
+
+        if (!ld_moved && !sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
+            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
+                ld_moved = -1;
+
+        goto out;
+
+out_balanced:
+        schedstat_inc(sd, lb_balanced[idle]);
+
+        sd->nr_balance_failed = 0;
+
+out_one_pinned:
+        /* tune up the balancing interval */
+        if ((all_pinned && sd->balance_interval < MAX_PINNED_INTERVAL) ||
+                        (sd->balance_interval < sd->max_interval))
+                sd->balance_interval *= 2;
+
+        if (!sd_idle && sd->flags & SD_SHARE_CPUPOWER &&
+            !test_sd_parent(sd, SD_POWERSAVINGS_BALANCE))
+                ld_moved = -1;
+        else
+                ld_moved = 0;
+out:
+        if (ld_moved)
+                update_shares(sd);
+        return ld_moved;
+}
+
+/*
+ * idle_balance is called by schedule() if this_cpu is about to become
+ * idle. Attempts to pull tasks from other CPUs.
+ */
+static void idle_balance(int this_cpu, struct rq *this_rq)
+{
+        struct sched_domain *sd;
+        int pulled_task = 0;
+        unsigned long next_balance = jiffies + HZ;
+
+        this_rq->idle_stamp = this_rq->clock;
+
+        if (this_rq->avg_idle < sysctl_sched_migration_cost)
+                return;
+
+        /*
+         * Drop the rq->lock, but keep IRQ/preempt disabled.
+         */
+        raw_spin_unlock(&this_rq->lock);
+
+        for_each_domain(this_cpu, sd) {
+                unsigned long interval;
+                int balance = 1;
+
+                if (!(sd->flags & SD_LOAD_BALANCE))
+                        continue;
+
+                if (sd->flags & SD_BALANCE_NEWIDLE) {
+                        /* If we've pulled tasks over stop searching: */
+                        pulled_task = load_balance(this_cpu, this_rq,
+                                                   sd, CPU_NEWLY_IDLE, &balance);
+                }
+
+                interval = msecs_to_jiffies(sd->balance_interval);
+                if (time_after(next_balance, sd->last_balance + interval))
+                        next_balance = sd->last_balance + interval;
+                if (pulled_task) {
+                        this_rq->idle_stamp = 0;
+                        break;
+                }
+        }
+
+        raw_spin_lock(&this_rq->lock);
+
+        if (pulled_task || time_after(jiffies, this_rq->next_balance)) {
+                /*
+                 * We are going idle. next_balance may be set based on
+                 * a busy processor. So reset next_balance.
+                 */
+                this_rq->next_balance = next_balance;
+        }
+}
+
+/*
+ * active_load_balance is run by migration threads. It pushes running tasks
+ * off the busiest CPU onto idle CPUs. It requires at least 1 task to be
+ * running on each physical CPU where possible, and avoids physical /
+ * logical imbalances.
+ *
+ * Called with busiest_rq locked.
+ */
+static void active_load_balance(struct rq *busiest_rq, int busiest_cpu)
+{
+        int target_cpu = busiest_rq->push_cpu;
+        struct sched_domain *sd;
+        struct rq *target_rq;
+
+        /* Is there any task to move? */
+        if (busiest_rq->nr_running <= 1)
+                return;
+
+        target_rq = cpu_rq(target_cpu);
+
+        /*
+         * This condition is "impossible", if it occurs
+         * we need to fix it. Originally reported by
+         * Bjorn Helgaas on a 128-cpu setup.
+         */
+        BUG_ON(busiest_rq == target_rq);
+
+        /* move a task from busiest_rq to target_rq */
+        double_lock_balance(busiest_rq, target_rq);
+        update_rq_clock(busiest_rq);
+        update_rq_clock(target_rq);
+
+        /* Search for an sd spanning us and the target CPU. */
+        for_each_domain(target_cpu, sd) {
+                if ((sd->flags & SD_LOAD_BALANCE) &&
+                    cpumask_test_cpu(busiest_cpu, sched_domain_span(sd)))
+                                break;
+        }
+
+        if (likely(sd)) {
+                schedstat_inc(sd, alb_count);
+
+                if (move_one_task(target_rq, target_cpu, busiest_rq,
+                                  sd, CPU_IDLE))
+                        schedstat_inc(sd, alb_pushed);
+                else
+                        schedstat_inc(sd, alb_failed);
+        }
+        double_unlock_balance(busiest_rq, target_rq);
+}
+
+#ifdef CONFIG_NO_HZ
+static struct {
+        atomic_t load_balancer;
+        cpumask_var_t cpu_mask;
+        cpumask_var_t ilb_grp_nohz_mask;
+} nohz ____cacheline_aligned = {
+        .load_balancer = ATOMIC_INIT(-1),
+};
+
+int get_nohz_load_balancer(void)
+{
+        return atomic_read(&nohz.load_balancer);
+}
+
+#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
+/**
+ * lowest_flag_domain - Return lowest sched_domain containing flag.
+ * @cpu:        The cpu whose lowest level of sched domain is to
+ *              be returned.
+ * @flag:       The flag to check for the lowest sched_domain
+ *              for the given cpu.
+ *
+ * Returns the lowest sched_domain of a cpu which contains the given flag.
+ */
+static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
+{
+        struct sched_domain *sd;
+
+        for_each_domain(cpu, sd)
+                if (sd && (sd->flags & flag))
+                        break;
+
+        return sd;
+}
+
+/**
+ * for_each_flag_domain - Iterates over sched_domains containing the flag.
+ * @cpu:        The cpu whose domains we're iterating over.
+ * @sd:         variable holding the value of the power_savings_sd
+ *              for cpu.
+ * @flag:       The flag to filter the sched_domains to be iterated.
+ *
+ * Iterates over all the scheduler domains for a given cpu that has the 'flag'
+ * set, starting from the lowest sched_domain to the highest.
+ */
+#define for_each_flag_domain(cpu, sd, flag) \
+        for (sd = lowest_flag_domain(cpu, flag); \
+                (sd && (sd->flags & flag)); sd = sd->parent)
+
+/**
+ * is_semi_idle_group - Checks if the given sched_group is semi-idle.
+ * @ilb_group:  group to be checked for semi-idleness
+ *
+ * Returns:     1 if the group is semi-idle. 0 otherwise.
+ *
+ * We define a sched_group to be semi idle if it has atleast one idle-CPU
+ * and atleast one non-idle CPU. This helper function checks if the given
+ * sched_group is semi-idle or not.
+ */
+static inline int is_semi_idle_group(struct sched_group *ilb_group)
+{
+        cpumask_and(nohz.ilb_grp_nohz_mask, nohz.cpu_mask,
+                                        sched_group_cpus(ilb_group));
+
+        /*
+         * A sched_group is semi-idle when it has atleast one busy cpu
+         * and atleast one idle cpu.
+         */
+        if (cpumask_empty(nohz.ilb_grp_nohz_mask))
+                return 0;
+
+        if (cpumask_equal(nohz.ilb_grp_nohz_mask, sched_group_cpus(ilb_group)))
+                return 0;
+
+        return 1;
+}
+/**
+ * find_new_ilb - Finds the optimum idle load balancer for nomination.
+ * @cpu:        The cpu which is nominating a new idle_load_balancer.
+ *
+ * Returns:     Returns the id of the idle load balancer if it exists,
+ *              Else, returns >= nr_cpu_ids.
+ *
+ * This algorithm picks the idle load balancer such that it belongs to a
+ * semi-idle powersavings sched_domain. The idea is to try and avoid
+ * completely idle packages/cores just for the purpose of idle load balancing
+ * when there are other idle cpu's which are better suited for that job.
+ */
+static int find_new_ilb(int cpu)
+{
+        struct sched_domain *sd;
+        struct sched_group *ilb_group;
+
+        /*
+         * Have idle load balancer selection from semi-idle packages only
+         * when power-aware load balancing is enabled
+         */
+        if (!(sched_smt_power_savings || sched_mc_power_savings))
+                goto out_done;
+
+        /*
+         * Optimize for the case when we have no idle CPUs or only one
+         * idle CPU. Don't walk the sched_domain hierarchy in such cases
+         */
+        if (cpumask_weight(nohz.cpu_mask) < 2)
+                goto out_done;
+
+        for_each_flag_domain(cpu, sd, SD_POWERSAVINGS_BALANCE) {
+                ilb_group = sd->groups;
+
+                do {
+                        if (is_semi_idle_group(ilb_group))
+                                return cpumask_first(nohz.ilb_grp_nohz_mask);
+
+                        ilb_group = ilb_group->next;
+
+                } while (ilb_group != sd->groups);
+        }
+
+out_done:
+        return cpumask_first(nohz.cpu_mask);
+}
+#else /*  (CONFIG_SCHED_MC || CONFIG_SCHED_SMT) */
+static inline int find_new_ilb(int call_cpu)
+{
+        return cpumask_first(nohz.cpu_mask);
+}
+#endif
+
+/*
+ * This routine will try to nominate the ilb (idle load balancing)
+ * owner among the cpus whose ticks are stopped. ilb owner will do the idle
+ * load balancing on behalf of all those cpus. If all the cpus in the system
+ * go into this tickless mode, then there will be no ilb owner (as there is
+ * no need for one) and all the cpus will sleep till the next wakeup event
+ * arrives...
+ *
+ * For the ilb owner, tick is not stopped. And this tick will be used
+ * for idle load balancing. ilb owner will still be part of
+ * nohz.cpu_mask..
+ *
+ * While stopping the tick, this cpu will become the ilb owner if there
+ * is no other owner. And will be the owner till that cpu becomes busy
+ * or if all cpus in the system stop their ticks at which point
+ * there is no need for ilb owner.
+ *
+ * When the ilb owner becomes busy, it nominates another owner, during the
+ * next busy scheduler_tick()
+ */
+int select_nohz_load_balancer(int stop_tick)
+{
+        int cpu = smp_processor_id();
+
+        if (stop_tick) {
+                cpu_rq(cpu)->in_nohz_recently = 1;
+
+                if (!cpu_active(cpu)) {
+                        if (atomic_read(&nohz.load_balancer) != cpu)
+                                return 0;
+
+                        /*
+                         * If we are going offline and still the leader,
+                         * give up!
+                         */
+                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+                                BUG();
+
+                        return 0;
+                }
+
+                cpumask_set_cpu(cpu, nohz.cpu_mask);
+
+                /* time for ilb owner also to sleep */
+                if (cpumask_weight(nohz.cpu_mask) == num_active_cpus()) {
+                        if (atomic_read(&nohz.load_balancer) == cpu)
+                                atomic_set(&nohz.load_balancer, -1);
+                        return 0;
+                }
+
+                if (atomic_read(&nohz.load_balancer) == -1) {
+                        /* make me the ilb owner */
+                        if (atomic_cmpxchg(&nohz.load_balancer, -1, cpu) == -1)
+                                return 1;
+                } else if (atomic_read(&nohz.load_balancer) == cpu) {
+                        int new_ilb;
+
+                        if (!(sched_smt_power_savings ||
+                                                sched_mc_power_savings))
+                                return 1;
+                        /*
+                         * Check to see if there is a more power-efficient
+                         * ilb.
+                         */
+                        new_ilb = find_new_ilb(cpu);
+                        if (new_ilb < nr_cpu_ids && new_ilb != cpu) {
+                                atomic_set(&nohz.load_balancer, -1);
+                                resched_cpu(new_ilb);
+                                return 0;
+                        }
+                        return 1;
+                }
+        } else {
+                if (!cpumask_test_cpu(cpu, nohz.cpu_mask))
+                        return 0;
+
+                cpumask_clear_cpu(cpu, nohz.cpu_mask);
+
+                if (atomic_read(&nohz.load_balancer) == cpu)
+                        if (atomic_cmpxchg(&nohz.load_balancer, cpu, -1) != cpu)
+                                BUG();
+        }
+        return 0;
+}
+#endif
+
+static DEFINE_SPINLOCK(balancing);
+
+/*
+ * It checks each scheduling domain to see if it is due to be balanced,
+ * and initiates a balancing operation if so.
+ *
+ * Balancing parameters are set up in arch_init_sched_domains.
+ */
+static void rebalance_domains(int cpu, enum cpu_idle_type idle)
+{
+        int balance = 1;
+        struct rq *rq = cpu_rq(cpu);
+        unsigned long interval;
+        struct sched_domain *sd;
+        /* Earliest time when we have to do rebalance again */
+        unsigned long next_balance = jiffies + 60*HZ;
+        int update_next_balance = 0;
+        int need_serialize;
+
+        for_each_domain(cpu, sd) {
+                if (!(sd->flags & SD_LOAD_BALANCE))
+                        continue;
+
+                interval = sd->balance_interval;
+                if (idle != CPU_IDLE)
+                        interval *= sd->busy_factor;
+
+                /* scale ms to jiffies */
+                interval = msecs_to_jiffies(interval);
+                if (unlikely(!interval))
+                        interval = 1;
+                if (interval > HZ*NR_CPUS/10)
+                        interval = HZ*NR_CPUS/10;
+
+                need_serialize = sd->flags & SD_SERIALIZE;
+
+                if (need_serialize) {
+                        if (!spin_trylock(&balancing))
+                                goto out;
+                }
+
+                if (time_after_eq(jiffies, sd->last_balance + interval)) {
+                        if (load_balance(cpu, rq, sd, idle, &balance)) {
+                                /*
+                                 * We've pulled tasks over so either we're no
+                                 * longer idle, or one of our SMT siblings is
+                                 * not idle.
+                                 */
+                                idle = CPU_NOT_IDLE;
+                        }
+                        sd->last_balance = jiffies;
+                }
+                if (need_serialize)
+                        spin_unlock(&balancing);
+out:
+                if (time_after(next_balance, sd->last_balance + interval)) {
+                        next_balance = sd->last_balance + interval;
+                        update_next_balance = 1;
+                }
+
+                /*
+                 * Stop the load balance at this level. There is another
+                 * CPU in our sched group which is doing load balancing more
+                 * actively.
+                 */
+                if (!balance)
+                        break;
+        }
+
+        /*
+         * next_balance will be updated only when there is a need.
+         * When the cpu is attached to null domain for ex, it will not be
+         * updated.
+         */
+        if (likely(update_next_balance))
+                rq->next_balance = next_balance;
+}
+
+/*
+ * run_rebalance_domains is triggered when needed from the scheduler tick.
+ * In CONFIG_NO_HZ case, the idle load balance owner will do the
+ * rebalancing for all the cpus for whom scheduler ticks are stopped.
+ */
+static void run_rebalance_domains(struct softirq_action *h)
+{
+        int this_cpu = smp_processor_id();
+        struct rq *this_rq = cpu_rq(this_cpu);
+        enum cpu_idle_type idle = this_rq->idle_at_tick ?
+                                                CPU_IDLE : CPU_NOT_IDLE;
+
+        rebalance_domains(this_cpu, idle);
+
+#ifdef CONFIG_NO_HZ
+        /*
+         * If this cpu is the owner for idle load balancing, then do the
+         * balancing on behalf of the other idle cpus whose ticks are
+         * stopped.
+         */
+        if (this_rq->idle_at_tick &&
+            atomic_read(&nohz.load_balancer) == this_cpu) {
+                struct rq *rq;
+                int balance_cpu;
+
+                for_each_cpu(balance_cpu, nohz.cpu_mask) {
+                        if (balance_cpu == this_cpu)
+                                continue;
+
+                        /*
+                         * If this cpu gets work to do, stop the load balancing
+                         * work being done for other cpus. Next load
+                         * balancing owner will pick it up.
+                         */
+                        if (need_resched())
+                                break;
+
+                        rebalance_domains(balance_cpu, CPU_IDLE);
+
+                        rq = cpu_rq(balance_cpu);
+                        if (time_after(this_rq->next_balance, rq->next_balance))
+                                this_rq->next_balance = rq->next_balance;
+                }
+        }
+#endif
+}
+
+static inline int on_null_domain(int cpu)
+{
+        return !rcu_dereference(cpu_rq(cpu)->sd);
+}
+
+/*
+ * Trigger the SCHED_SOFTIRQ if it is time to do periodic load balancing.
+ *
+ * In case of CONFIG_NO_HZ, this is the place where we nominate a new
+ * idle load balancing owner or decide to stop the periodic load balancing,
+ * if the whole system is idle.
+ */
+static inline void trigger_load_balance(struct rq *rq, int cpu)
+{
+#ifdef CONFIG_NO_HZ
+        /*
+         * If we were in the nohz mode recently and busy at the current
+         * scheduler tick, then check if we need to nominate new idle
+         * load balancer.
+         */
+        if (rq->in_nohz_recently && !rq->idle_at_tick) {
+                rq->in_nohz_recently = 0;
+
+                if (atomic_read(&nohz.load_balancer) == cpu) {
+                        cpumask_clear_cpu(cpu, nohz.cpu_mask);
+                        atomic_set(&nohz.load_balancer, -1);
+                }
+
+                if (atomic_read(&nohz.load_balancer) == -1) {
+                        int ilb = find_new_ilb(cpu);
+
+                        if (ilb < nr_cpu_ids)
+                                resched_cpu(ilb);
+                }
+        }
+
+        /*
+         * If this cpu is idle and doing idle load balancing for all the
+         * cpus with ticks stopped, is it time for that to stop?
+         */
+        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) == cpu &&
+            cpumask_weight(nohz.cpu_mask) == num_online_cpus()) {
+                resched_cpu(cpu);
+                return;
+        }
+
+        /*
+         * If this cpu is idle and the idle load balancing is done by
+         * someone else, then no need raise the SCHED_SOFTIRQ
+         */
+        if (rq->idle_at_tick && atomic_read(&nohz.load_balancer) != cpu &&
+            cpumask_test_cpu(cpu, nohz.cpu_mask))
+                return;
+#endif
+        /* Don't need to rebalance while attached to NULL domain */
+        if (time_after_eq(jiffies, rq->next_balance) &&
+            likely(!on_null_domain(cpu)))
+                raise_softirq(SCHED_SOFTIRQ);
+}
 
 static void rq_online_fair(struct rq *rq)
 {
@@ -1962,6 +3544,15 @@ static void rq_offline_fair(struct rq *rq)
         update_sysctl();
 }
 
+#else   /* CONFIG_SMP */
+
+/*
+ * on UP we do not need to balance between CPUs:
+ */
+static inline void idle_balance(int cpu, struct rq *rq)
+{
+}
+
 #endif /* CONFIG_SMP */
 
 /*
@@ -2076,7 +3667,7 @@ static void moved_group_fair(struct task_struct *p, int on_rq)
 }
 #endif
 
-unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task)
+static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task)
 {
         struct sched_entity *se = &task->se;
         unsigned int rr_interval = 0;
@@ -2108,8 +3699,6 @@ static const struct sched_class fair_sched_class = {
 #ifdef CONFIG_SMP
         .select_task_rq         = select_task_rq_fair,
 
-        .load_balance           = load_balance_fair,
-        .move_one_task          = move_one_task_fair,
         .rq_online              = rq_online_fair,
         .rq_offline             = rq_offline_fair,
 
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 5f93b570d383..a8a6d8a50947 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -44,24 +44,6 @@ static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
 {
 }
 
-#ifdef CONFIG_SMP
-static unsigned long
-load_balance_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                  unsigned long max_load_move,
-                  struct sched_domain *sd, enum cpu_idle_type idle,
-                  int *all_pinned, int *this_best_prio)
-{
-        return 0;
-}
-
-static int
-move_one_task_idle(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                   struct sched_domain *sd, enum cpu_idle_type idle)
-{
-        return 0;
-}
-#endif
-
 static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued)
 {
 }
@@ -97,7 +79,7 @@ static void prio_changed_idle(struct rq *rq, struct task_struct *p,
                 check_preempt_curr(rq, p, 0);
 }
 
-unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
+static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
 {
         return 0;
 }
@@ -119,9 +101,6 @@ static const struct sched_class idle_sched_class = {
 
 #ifdef CONFIG_SMP
         .select_task_rq         = select_task_rq_idle,
-
-        .load_balance           = load_balance_idle,
-        .move_one_task          = move_one_task_idle,
 #endif
 
         .set_curr_task          = set_curr_task_idle,
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index f48328ac216f..bf3e38fdbe6d 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -194,17 +194,20 @@ static inline struct rt_rq *group_rt_rq(struct sched_rt_entity *rt_se)
         return rt_se->my_q;
 }
 
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se);
+static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head);
 static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
 
 static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
 {
+        int this_cpu = smp_processor_id();
         struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
-        struct sched_rt_entity *rt_se = rt_rq->rt_se;
+        struct sched_rt_entity *rt_se;
+
+        rt_se = rt_rq->tg->rt_se[this_cpu];
 
         if (rt_rq->rt_nr_running) {
                 if (rt_se && !on_rt_rq(rt_se))
-                        enqueue_rt_entity(rt_se);
+                        enqueue_rt_entity(rt_se, false);
                 if (rt_rq->highest_prio.curr < curr->prio)
                         resched_task(curr);
         }
@@ -212,7 +215,10 @@ static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
 
 static void sched_rt_rq_dequeue(struct rt_rq *rt_rq)
 {
-        struct sched_rt_entity *rt_se = rt_rq->rt_se;
+        int this_cpu = smp_processor_id();
+        struct sched_rt_entity *rt_se;
+
+        rt_se = rt_rq->tg->rt_se[this_cpu];
 
         if (rt_se && on_rt_rq(rt_se))
                 dequeue_rt_entity(rt_se);
@@ -803,7 +809,7 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
         dec_rt_group(rt_se, rt_rq);
 }
 
-static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
+static void __enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
 {
         struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
         struct rt_prio_array *array = &rt_rq->active;
@@ -819,7 +825,10 @@ 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;
 
-        list_add_tail(&rt_se->run_list, queue);
+        if (head)
+                list_add(&rt_se->run_list, queue);
+        else
+                list_add_tail(&rt_se->run_list, queue);
         __set_bit(rt_se_prio(rt_se), array->bitmap);
 
         inc_rt_tasks(rt_se, rt_rq);
@@ -856,11 +865,11 @@ static void dequeue_rt_stack(struct sched_rt_entity *rt_se)
         }
 }
 
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
+static void enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
 {
         dequeue_rt_stack(rt_se);
         for_each_sched_rt_entity(rt_se)
-                __enqueue_rt_entity(rt_se);
+                __enqueue_rt_entity(rt_se, head);
 }
 
 static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
@@ -871,21 +880,22 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
                 struct rt_rq *rt_rq = group_rt_rq(rt_se);
 
                 if (rt_rq && rt_rq->rt_nr_running)
-                        __enqueue_rt_entity(rt_se);
+                        __enqueue_rt_entity(rt_se, false);
         }
 }
 
 /*
  * Adding/removing a task to/from a priority array:
  */
-static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
+static void
+enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup, bool head)
 {
         struct sched_rt_entity *rt_se = &p->rt;
 
         if (wakeup)
                 rt_se->timeout = 0;
 
-        enqueue_rt_entity(rt_se);
+        enqueue_rt_entity(rt_se, head);
 
         if (!task_current(rq, p) && p->rt.nr_cpus_allowed > 1)
                 enqueue_pushable_task(rq, p);
@@ -1481,24 +1491,6 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
                 push_rt_tasks(rq);
 }
 
-static unsigned long
-load_balance_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                unsigned long max_load_move,
-                struct sched_domain *sd, enum cpu_idle_type idle,
-                int *all_pinned, int *this_best_prio)
-{
-        /* don't touch RT tasks */
-        return 0;
-}
-
-static int
-move_one_task_rt(struct rq *this_rq, int this_cpu, struct rq *busiest,
-                 struct sched_domain *sd, enum cpu_idle_type idle)
-{
-        /* don't touch RT tasks */
-        return 0;
-}
-
 static void set_cpus_allowed_rt(struct task_struct *p,
                                 const struct cpumask *new_mask)
 {
@@ -1721,7 +1713,7 @@ static void set_curr_task_rt(struct rq *rq)
         dequeue_pushable_task(rq, p);
 }
 
-unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task)
+static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task)
 {
         /*
          * Time slice is 0 for SCHED_FIFO tasks
@@ -1746,8 +1738,6 @@ static const struct sched_class rt_sched_class = {
 #ifdef CONFIG_SMP
         .select_task_rq         = select_task_rq_rt,
 
-        .load_balance           = load_balance_rt,
-        .move_one_task          = move_one_task_rt,
         .set_cpus_allowed       = set_cpus_allowed_rt,
         .rq_online              = rq_online_rt,
         .rq_offline             = rq_offline_rt,
diff --git a/kernel/sys.c b/kernel/sys.c
index 18bde979f346..877fe4f8e05e 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -571,11 +571,6 @@ static int set_user(struct cred *new)
         if (!new_user)
                 return -EAGAIN;
 
-        if (!task_can_switch_user(new_user, current)) {
-                free_uid(new_user);
-                return -EINVAL;
-        }
-
         if (atomic_read(&new_user->processes) >=
                                 current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
                         new_user != INIT_USER) {
diff --git a/kernel/user.c b/kernel/user.c
index 46d0165ca70c..766467b3bcb7 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -56,9 +56,6 @@ struct user_struct root_user = {
         .sigpending     = ATOMIC_INIT(0),
         .locked_shm     = 0,
         .user_ns        = &init_user_ns,
-#ifdef CONFIG_USER_SCHED
-        .tg             = &init_task_group,
-#endif
 };
 
 /*
@@ -75,268 +72,6 @@ static void uid_hash_remove(struct user_struct *up)
         put_user_ns(up->user_ns);
 }
 
-#ifdef CONFIG_USER_SCHED
-
-static void sched_destroy_user(struct user_struct *up)
-{
-        sched_destroy_group(up->tg);
-}
-
-static int sched_create_user(struct user_struct *up)
-{
-        int rc = 0;
-
-        up->tg = sched_create_group(&root_task_group);
-        if (IS_ERR(up->tg))
-                rc = -ENOMEM;
-
-        set_tg_uid(up);
-
-        return rc;
-}
-
-#else   /* CONFIG_USER_SCHED */
-
-static void sched_destroy_user(struct user_struct *up) { }
-static int sched_create_user(struct user_struct *up) { return 0; }
-
-#endif  /* CONFIG_USER_SCHED */
-
-#if defined(CONFIG_USER_SCHED) && defined(CONFIG_SYSFS)
-
-static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
-{
-        struct user_struct *user;
-        struct hlist_node *h;
-
-        hlist_for_each_entry(user, h, hashent, uidhash_node) {
-                if (user->uid == uid) {
-                        /* possibly resurrect an "almost deleted" object */
-                        if (atomic_inc_return(&user->__count) == 1)
-                                cancel_delayed_work(&user->work);
-                        return user;
-                }
-        }
-
-        return NULL;
-}
-
-static struct kset *uids_kset; /* represents the /sys/kernel/uids/ directory */
-static DEFINE_MUTEX(uids_mutex);
-
-static inline void uids_mutex_lock(void)
-{
-        mutex_lock(&uids_mutex);
-}
-
-static inline void uids_mutex_unlock(void)
-{
-        mutex_unlock(&uids_mutex);
-}
-
-/* uid directory attributes */
-#ifdef CONFIG_FAIR_GROUP_SCHED
-static ssize_t cpu_shares_show(struct kobject *kobj,
-                               struct kobj_attribute *attr,
-                               char *buf)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-
-        return sprintf(buf, "%lu\n", sched_group_shares(up->tg));
-}
-
-static ssize_t cpu_shares_store(struct kobject *kobj,
-                                struct kobj_attribute *attr,
-                                const char *buf, size_t size)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-        unsigned long shares;
-        int rc;
-
-        sscanf(buf, "%lu", &shares);
-
-        rc = sched_group_set_shares(up->tg, shares);
-
-        return (rc ? rc : size);
-}
-
-static struct kobj_attribute cpu_share_attr =
-        __ATTR(cpu_share, 0644, cpu_shares_show, cpu_shares_store);
-#endif
-
-#ifdef CONFIG_RT_GROUP_SCHED
-static ssize_t cpu_rt_runtime_show(struct kobject *kobj,
-                                   struct kobj_attribute *attr,
-                                   char *buf)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-
-        return sprintf(buf, "%ld\n", sched_group_rt_runtime(up->tg));
-}
-
-static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
-                                    struct kobj_attribute *attr,
-                                    const char *buf, size_t size)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-        unsigned long rt_runtime;
-        int rc;
-
-        sscanf(buf, "%ld", &rt_runtime);
-
-        rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
-
-        return (rc ? rc : size);
-}
-
-static struct kobj_attribute cpu_rt_runtime_attr =
-        __ATTR(cpu_rt_runtime, 0644, cpu_rt_runtime_show, cpu_rt_runtime_store);
-
-static ssize_t cpu_rt_period_show(struct kobject *kobj,
-                                   struct kobj_attribute *attr,
-                                   char *buf)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-
-        return sprintf(buf, "%lu\n", sched_group_rt_period(up->tg));
-}
-
-static ssize_t cpu_rt_period_store(struct kobject *kobj,
-                                    struct kobj_attribute *attr,
-                                    const char *buf, size_t size)
-{
-        struct user_struct *up = container_of(kobj, struct user_struct, kobj);
-        unsigned long rt_period;
-        int rc;
-
-        sscanf(buf, "%lu", &rt_period);
-
-        rc = sched_group_set_rt_period(up->tg, rt_period);
-
-        return (rc ? rc : size);
-}
-
-static struct kobj_attribute cpu_rt_period_attr =
-        __ATTR(cpu_rt_period, 0644, cpu_rt_period_show, cpu_rt_period_store);
-#endif
-
-/* default attributes per uid directory */
-static struct attribute *uids_attributes[] = {
-#ifdef CONFIG_FAIR_GROUP_SCHED
-        &cpu_share_attr.attr,
-#endif
-#ifdef CONFIG_RT_GROUP_SCHED
-        &cpu_rt_runtime_attr.attr,
-        &cpu_rt_period_attr.attr,
-#endif
-        NULL
-};
-
-/* the lifetime of user_struct is not managed by the core (now) */
-static void uids_release(struct kobject *kobj)
-{
-        return;
-}
-
-static struct kobj_type uids_ktype = {
-        .sysfs_ops = &kobj_sysfs_ops,
-        .default_attrs = uids_attributes,
-        .release = uids_release,
-};
-
-/*
- * Create /sys/kernel/uids/<uid>/cpu_share file for this user
- * We do not create this file for users in a user namespace (until
- * sysfs tagging is implemented).
- *
- * See Documentation/scheduler/sched-design-CFS.txt for ramifications.
- */
-static int uids_user_create(struct user_struct *up)
-{
-        struct kobject *kobj = &up->kobj;
-        int error;
-
-        memset(kobj, 0, sizeof(struct kobject));
-        if (up->user_ns != &init_user_ns)
-                return 0;
-        kobj->kset = uids_kset;
-        error = kobject_init_and_add(kobj, &uids_ktype, NULL, "%d", up->uid);
-        if (error) {
-                kobject_put(kobj);
-                goto done;
-        }
-
-        kobject_uevent(kobj, KOBJ_ADD);
-done:
-        return error;
-}
-
-/* create these entries in sysfs:
- *      "/sys/kernel/uids" directory
- *      "/sys/kernel/uids/0" directory (for root user)
- *      "/sys/kernel/uids/0/cpu_share" file (for root user)
- */
-int __init uids_sysfs_init(void)
-{
-        uids_kset = kset_create_and_add("uids", NULL, kernel_kobj);
-        if (!uids_kset)
-                return -ENOMEM;
-
-        return uids_user_create(&root_user);
-}
-
-/* delayed work function to remove sysfs directory for a user and free up
- * corresponding structures.
- */
-static void cleanup_user_struct(struct work_struct *w)
-{
-        struct user_struct *up = container_of(w, struct user_struct, work.work);
-        unsigned long flags;
-        int remove_user = 0;
-
-        /* Make uid_hash_remove() + sysfs_remove_file() + kobject_del()
-         * atomic.
-         */
-        uids_mutex_lock();
-
-        spin_lock_irqsave(&uidhash_lock, flags);
-        if (atomic_read(&up->__count) == 0) {
-                uid_hash_remove(up);
-                remove_user = 1;
-        }
-        spin_unlock_irqrestore(&uidhash_lock, flags);
-
-        if (!remove_user)
-                goto done;
-
-        if (up->user_ns == &init_user_ns) {
-                kobject_uevent(&up->kobj, KOBJ_REMOVE);
-                kobject_del(&up->kobj);
-                kobject_put(&up->kobj);
-        }
-
-        sched_destroy_user(up);
-        key_put(up->uid_keyring);
-        key_put(up->session_keyring);
-        kmem_cache_free(uid_cachep, up);
-
-done:
-        uids_mutex_unlock();
-}
-
-/* IRQs are disabled and uidhash_lock is held upon function entry.
- * IRQ state (as stored in flags) is restored and uidhash_lock released
- * upon function exit.
- */
-static void free_user(struct user_struct *up, unsigned long flags)
-{
-        INIT_DELAYED_WORK(&up->work, cleanup_user_struct);
-        schedule_delayed_work(&up->work, msecs_to_jiffies(1000));
-        spin_unlock_irqrestore(&uidhash_lock, flags);
-}
-
-#else   /* CONFIG_USER_SCHED && CONFIG_SYSFS */
-
 static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
 {
         struct user_struct *user;
@@ -352,11 +87,6 @@ static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
         return NULL;
 }
 
-int uids_sysfs_init(void) { return 0; }
-static inline int uids_user_create(struct user_struct *up) { return 0; }
-static inline void uids_mutex_lock(void) { }
-static inline void uids_mutex_unlock(void) { }
-
 /* IRQs are disabled and uidhash_lock is held upon function entry.
  * IRQ state (as stored in flags) is restored and uidhash_lock released
  * upon function exit.
@@ -365,32 +95,11 @@ static void free_user(struct user_struct *up, unsigned long flags)
 {
         uid_hash_remove(up);
         spin_unlock_irqrestore(&uidhash_lock, flags);
-        sched_destroy_user(up);
         key_put(up->uid_keyring);
         key_put(up->session_keyring);
         kmem_cache_free(uid_cachep, up);
 }
 
-#endif
-
-#if defined(CONFIG_RT_GROUP_SCHED) && defined(CONFIG_USER_SCHED)
-/*
- * We need to check if a setuid can take place. This function should be called
- * before successfully completing the setuid.
- */
-int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
-{
-
-        return sched_rt_can_attach(up->tg, tsk);
-
-}
-#else
-int task_can_switch_user(struct user_struct *up, struct task_struct *tsk)
-{
-        return 1;
-}
-#endif
-
 /*
  * Locate the user_struct for the passed UID.  If found, take a ref on it.  The
  * caller must undo that ref with free_uid().
@@ -431,8 +140,6 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
         /* Make uid_hash_find() + uids_user_create() + uid_hash_insert()
          * atomic.
          */
-        uids_mutex_lock();
-
         spin_lock_irq(&uidhash_lock);
         up = uid_hash_find(uid, hashent);
         spin_unlock_irq(&uidhash_lock);
@@ -445,14 +152,8 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
                 new->uid = uid;
                 atomic_set(&new->__count, 1);
 
-                if (sched_create_user(new) < 0)
-                        goto out_free_user;
-
                 new->user_ns = get_user_ns(ns);
 
-                if (uids_user_create(new))
-                        goto out_destoy_sched;
-
                 /*
                  * Before adding this, check whether we raced
                  * on adding the same user already..
@@ -475,17 +176,11 @@ struct user_struct *alloc_uid(struct user_namespace *ns, uid_t uid)
                 spin_unlock_irq(&uidhash_lock);
         }
 
-        uids_mutex_unlock();
-
         return up;
 
-out_destoy_sched:
-        sched_destroy_user(new);
         put_user_ns(new->user_ns);
-out_free_user:
         kmem_cache_free(uid_cachep, new);
 out_unlock:
-        uids_mutex_unlock();
         return NULL;
 }