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

Pull scheduler updates from Ingo Molnar:
 "The main changes:

   - load-calculation cleanups and improvements, by Alex Shi
   - various nohz related tidying up of statisics, by Frederic
     Weisbecker
   - factor out /proc functions to kernel/sched/proc.c, by Paul
     Gortmaker
   - simplify the RT policy scheduler, by Kirill Tkhai
   - various fixes and cleanups"

* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (42 commits)
  sched/debug: Remove CONFIG_FAIR_GROUP_SCHED mask
  sched/debug: Fix formatting of /proc/<PID>/sched
  sched: Fix typo in struct sched_avg member description
  sched/fair: Fix typo describing flags in enqueue_entity
  sched/debug: Add load-tracking statistics to task
  sched: Change get_rq_runnable_load() to static and inline
  sched/tg: Remove tg.load_weight
  sched/cfs_rq: Change atomic64_t removed_load to atomic_long_t
  sched/tg: Use 'unsigned long' for load variable in task group
  sched: Change cfs_rq load avg to unsigned long
  sched: Consider runnable load average in move_tasks()
  sched: Compute runnable load avg in cpu_load and cpu_avg_load_per_task
  sched: Update cpu load after task_tick
  sched: Fix sleep time double accounting in enqueue entity
  sched: Set an initial value of runnable avg for new forked task
  sched: Move a few runnable tg variables into CONFIG_SMP
  Revert "sched: Introduce temporary FAIR_GROUP_SCHED dependency for load-tracking"
  sched: Don't mix use of typedef ctl_table and struct ctl_table
  sched: Remove WARN_ON(!sd) from init_sched_groups_power()
  sched: Fix memory leakage in build_sched_groups()
  ...

14 files changed, 819 insertions, 858 deletions

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 64b3f791bbe5..902d13fc2b13 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -540,7 +540,7 @@ static void update_domain_attr_tree(struct sched_domain_attr *dattr,
  * This function builds a partial partition of the systems CPUs
  * A 'partial partition' is a set of non-overlapping subsets whose
  * union is a subset of that set.
- * The output of this function needs to be passed to kernel/sched.c
+ * The output of this function needs to be passed to kernel/sched/core.c
  * partition_sched_domains() routine, which will rebuild the scheduler's
  * load balancing domains (sched domains) as specified by that partial
  * partition.
@@ -569,7 +569,7 @@ static void update_domain_attr_tree(struct sched_domain_attr *dattr,
  *	   is a subset of one of these domains, while there are as
  *	   many such domains as possible, each as small as possible.
  * doms  - Conversion of 'csa' to an array of cpumasks, for passing to
- *	   the kernel/sched.c routine partition_sched_domains() in a
+ *	   the kernel/sched/core.c routine partition_sched_domains() in a
  *	   convenient format, that can be easily compared to the prior
  *	   value to determine what partition elements (sched domains)
  *	   were changed (added or removed.)
diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
index deaf90e4a1de..54adcf35f495 100644
--- a/kernel/sched/Makefile
+++ b/kernel/sched/Makefile
@@ -11,7 +11,7 @@ ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 CFLAGS_core.o := $(PROFILING) -fno-omit-frame-pointer
 endif
 
-obj-y += core.o clock.o cputime.o idle_task.o fair.o rt.o stop_task.o
+obj-y += core.o proc.o clock.o cputime.o idle_task.o fair.o rt.o stop_task.o
 obj-$(CONFIG_SMP) += cpupri.o
 obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
 obj-$(CONFIG_SCHEDSTATS) += stats.o
diff --git a/kernel/sched/auto_group.c b/kernel/sched/auto_group.c
index 64de5f8b0c9e..4a073539c58e 100644
--- a/kernel/sched/auto_group.c
+++ b/kernel/sched/auto_group.c
@@ -77,8 +77,6 @@ static inline struct autogroup *autogroup_create(void)
 	if (IS_ERR(tg))
 		goto out_free;
 
-	sched_online_group(tg, &root_task_group);
-
 	kref_init(&ag->kref);
 	init_rwsem(&ag->lock);
 	ag->id = atomic_inc_return(&autogroup_seq_nr);
@@ -98,6 +96,7 @@ static inline struct autogroup *autogroup_create(void)
 #endif
 	tg->autogroup = ag;
 
+	sched_online_group(tg, &root_task_group);
 	return ag;
 
 out_free:
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e8b335016c52..9b1f2e533b95 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -679,7 +679,7 @@ void sched_avg_update(struct rq *rq)
 {
 	s64 period = sched_avg_period();
 
-	while ((s64)(rq->clock - rq->age_stamp) > period) {
+	while ((s64)(rq_clock(rq) - rq->age_stamp) > period) {
 		/*
 		 * Inline assembly required to prevent the compiler
 		 * optimising this loop into a divmod call.
@@ -1340,7 +1340,7 @@ ttwu_do_wakeup(struct rq *rq, struct task_struct *p, int wake_flags)
 		p->sched_class->task_woken(rq, p);
 
 	if (rq->idle_stamp) {
-		u64 delta = rq->clock - rq->idle_stamp;
+		u64 delta = rq_clock(rq) - rq->idle_stamp;
 		u64 max = 2*sysctl_sched_migration_cost;
 
 		if (delta > max)
@@ -1377,6 +1377,8 @@ static int ttwu_remote(struct task_struct *p, int wake_flags)
 
 	rq = __task_rq_lock(p);
 	if (p->on_rq) {
+		/* check_preempt_curr() may use rq clock */
+		update_rq_clock(rq);
 		ttwu_do_wakeup(rq, p, wake_flags);
 		ret = 1;
 	}
@@ -1609,15 +1611,6 @@ static void __sched_fork(struct task_struct *p)
 	p->se.vruntime			= 0;
 	INIT_LIST_HEAD(&p->se.group_node);
 
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
-	p->se.avg.runnable_avg_period = 0;
-	p->se.avg.runnable_avg_sum = 0;
-#endif
 #ifdef CONFIG_SCHEDSTATS
 	memset(&p->se.statistics, 0, sizeof(p->se.statistics));
 #endif
@@ -1761,6 +1754,8 @@ void wake_up_new_task(struct task_struct *p)
 	set_task_cpu(p, select_task_rq(p, SD_BALANCE_FORK, 0));
 #endif
 
+	/* Initialize new task's runnable average */
+	init_task_runnable_average(p);
 	rq = __task_rq_lock(p);
 	activate_task(rq, p, 0);
 	p->on_rq = 1;
@@ -2069,575 +2064,6 @@ unsigned long nr_iowait_cpu(int cpu)
 	return atomic_read(&this->nr_iowait);
 }
 
-unsigned long this_cpu_load(void)
-{
-	struct rq *this = this_rq();
-	return this->cpu_load[0];
-}
-
-
-/*
- * Global load-average calculations
- *
- * We take a distributed and async approach to calculating the global load-avg
- * in order to minimize overhead.
- *
- * The global load average is an exponentially decaying average of nr_running +
- * nr_uninterruptible.
- *
- * Once every LOAD_FREQ:
- *
- *   nr_active = 0;
- *   for_each_possible_cpu(cpu)
- *   	nr_active += cpu_of(cpu)->nr_running + cpu_of(cpu)->nr_uninterruptible;
- *
- *   avenrun[n] = avenrun[0] * exp_n + nr_active * (1 - exp_n)
- *
- * Due to a number of reasons the above turns in the mess below:
- *
- *  - for_each_possible_cpu() is prohibitively expensive on machines with
- *    serious number of cpus, therefore we need to take a distributed approach
- *    to calculating nr_active.
- *
- *        \Sum_i x_i(t) = \Sum_i x_i(t) - x_i(t_0) | x_i(t_0) := 0
- *                      = \Sum_i { \Sum_j=1 x_i(t_j) - x_i(t_j-1) }
- *
- *    So assuming nr_active := 0 when we start out -- true per definition, we
- *    can simply take per-cpu deltas and fold those into a global accumulate
- *    to obtain the same result. See calc_load_fold_active().
- *
- *    Furthermore, in order to avoid synchronizing all per-cpu delta folding
- *    across the machine, we assume 10 ticks is sufficient time for every
- *    cpu to have completed this task.
- *
- *    This places an upper-bound on the IRQ-off latency of the machine. Then
- *    again, being late doesn't loose the delta, just wrecks the sample.
- *
- *  - cpu_rq()->nr_uninterruptible isn't accurately tracked per-cpu because
- *    this would add another cross-cpu cacheline miss and atomic operation
- *    to the wakeup path. Instead we increment on whatever cpu the task ran
- *    when it went into uninterruptible state and decrement on whatever cpu
- *    did the wakeup. This means that only the sum of nr_uninterruptible over
- *    all cpus yields the correct result.
- *
- *  This covers the NO_HZ=n code, for extra head-aches, see the comment below.
- */
-
-/* Variables and functions for calc_load */
-static atomic_long_t calc_load_tasks;
-static unsigned long calc_load_update;
-unsigned long avenrun[3];
-EXPORT_SYMBOL(avenrun); /* should be removed */
-
-/**
- * get_avenrun - get the load average array
- * @loads:	pointer to dest load array
- * @offset:	offset to add
- * @shift:	shift count to shift the result left
- *
- * These values are estimates at best, so no need for locking.
- */
-void get_avenrun(unsigned long *loads, unsigned long offset, int shift)
-{
-	loads[0] = (avenrun[0] + offset) << shift;
-	loads[1] = (avenrun[1] + offset) << shift;
-	loads[2] = (avenrun[2] + offset) << shift;
-}
-
-static long calc_load_fold_active(struct rq *this_rq)
-{
-	long nr_active, delta = 0;
-
-	nr_active = this_rq->nr_running;
-	nr_active += (long) this_rq->nr_uninterruptible;
-
-	if (nr_active != this_rq->calc_load_active) {
-		delta = nr_active - this_rq->calc_load_active;
-		this_rq->calc_load_active = nr_active;
-	}
-
-	return delta;
-}
-
-/*
- * a1 = a0 * e + a * (1 - e)
- */
-static unsigned long
-calc_load(unsigned long load, unsigned long exp, unsigned long active)
-{
-	load *= exp;
-	load += active * (FIXED_1 - exp);
-	load += 1UL << (FSHIFT - 1);
-	return load >> FSHIFT;
-}
-
-#ifdef CONFIG_NO_HZ_COMMON
-/*
- * Handle NO_HZ for the global load-average.
- *
- * Since the above described distributed algorithm to compute the global
- * load-average relies on per-cpu sampling from the tick, it is affected by
- * NO_HZ.
- *
- * The basic idea is to fold the nr_active delta into a global idle-delta upon
- * entering NO_HZ state such that we can include this as an 'extra' cpu delta
- * when we read the global state.
- *
- * Obviously reality has to ruin such a delightfully simple scheme:
- *
- *  - When we go NO_HZ idle during the window, we can negate our sample
- *    contribution, causing under-accounting.
- *
- *    We avoid this by keeping two idle-delta counters and flipping them
- *    when the window starts, thus separating old and new NO_HZ load.
- *
- *    The only trick is the slight shift in index flip for read vs write.
- *
- *        0s            5s            10s           15s
- *          +10           +10           +10           +10
- *        |-|-----------|-|-----------|-|-----------|-|
- *    r:0 0 1           1 0           0 1           1 0
- *    w:0 1 1           0 0           1 1           0 0
- *
- *    This ensures we'll fold the old idle contribution in this window while
- *    accumlating the new one.
- *
- *  - When we wake up from NO_HZ idle during the window, we push up our
- *    contribution, since we effectively move our sample point to a known
- *    busy state.
- *
- *    This is solved by pushing the window forward, and thus skipping the
- *    sample, for this cpu (effectively using the idle-delta for this cpu which
- *    was in effect at the time the window opened). This also solves the issue
- *    of having to deal with a cpu having been in NOHZ idle for multiple
- *    LOAD_FREQ intervals.
- *
- * When making the ILB scale, we should try to pull this in as well.
- */
-static atomic_long_t calc_load_idle[2];
-static int calc_load_idx;
-
-static inline int calc_load_write_idx(void)
-{
-	int idx = calc_load_idx;
-
-	/*
-	 * See calc_global_nohz(), if we observe the new index, we also
-	 * need to observe the new update time.
-	 */
-	smp_rmb();
-
-	/*
-	 * If the folding window started, make sure we start writing in the
-	 * next idle-delta.
-	 */
-	if (!time_before(jiffies, calc_load_update))
-		idx++;
-
-	return idx & 1;
-}
-
-static inline int calc_load_read_idx(void)
-{
-	return calc_load_idx & 1;
-}
-
-void calc_load_enter_idle(void)
-{
-	struct rq *this_rq = this_rq();
-	long delta;
-
-	/*
-	 * We're going into NOHZ mode, if there's any pending delta, fold it
-	 * into the pending idle delta.
-	 */
-	delta = calc_load_fold_active(this_rq);
-	if (delta) {
-		int idx = calc_load_write_idx();
-		atomic_long_add(delta, &calc_load_idle[idx]);
-	}
-}
-
-void calc_load_exit_idle(void)
-{
-	struct rq *this_rq = this_rq();
-
-	/*
-	 * If we're still before the sample window, we're done.
-	 */
-	if (time_before(jiffies, this_rq->calc_load_update))
-		return;
-
-	/*
-	 * We woke inside or after the sample window, this means we're already
-	 * accounted through the nohz accounting, so skip the entire deal and
-	 * sync up for the next window.
-	 */
-	this_rq->calc_load_update = calc_load_update;
-	if (time_before(jiffies, this_rq->calc_load_update + 10))
-		this_rq->calc_load_update += LOAD_FREQ;
-}
-
-static long calc_load_fold_idle(void)
-{
-	int idx = calc_load_read_idx();
-	long delta = 0;
-
-	if (atomic_long_read(&calc_load_idle[idx]))
-		delta = atomic_long_xchg(&calc_load_idle[idx], 0);
-
-	return delta;
-}
-
-/**
- * fixed_power_int - compute: x^n, in O(log n) time
- *
- * @x:         base of the power
- * @frac_bits: fractional bits of @x
- * @n:         power to raise @x to.
- *
- * By exploiting the relation between the definition of the natural power
- * function: x^n := x*x*...*x (x multiplied by itself for n times), and
- * the binary encoding of numbers used by computers: n := \Sum n_i * 2^i,
- * (where: n_i \elem {0, 1}, the binary vector representing n),
- * we find: x^n := x^(\Sum n_i * 2^i) := \Prod x^(n_i * 2^i), which is
- * of course trivially computable in O(log_2 n), the length of our binary
- * vector.
- */
-static unsigned long
-fixed_power_int(unsigned long x, unsigned int frac_bits, unsigned int n)
-{
-	unsigned long result = 1UL << frac_bits;
-
-	if (n) for (;;) {
-		if (n & 1) {
-			result *= x;
-			result += 1UL << (frac_bits - 1);
-			result >>= frac_bits;
-		}
-		n >>= 1;
-		if (!n)
-			break;
-		x *= x;
-		x += 1UL << (frac_bits - 1);
-		x >>= frac_bits;
-	}
-
-	return result;
-}
-
-/*
- * a1 = a0 * e + a * (1 - e)
- *
- * a2 = a1 * e + a * (1 - e)
- *    = (a0 * e + a * (1 - e)) * e + a * (1 - e)
- *    = a0 * e^2 + a * (1 - e) * (1 + e)
- *
- * a3 = a2 * e + a * (1 - e)
- *    = (a0 * e^2 + a * (1 - e) * (1 + e)) * e + a * (1 - e)
- *    = a0 * e^3 + a * (1 - e) * (1 + e + e^2)
- *
- *  ...
- *
- * an = a0 * e^n + a * (1 - e) * (1 + e + ... + e^n-1) [1]
- *    = a0 * e^n + a * (1 - e) * (1 - e^n)/(1 - e)
- *    = a0 * e^n + a * (1 - e^n)
- *
- * [1] application of the geometric series:
- *
- *              n         1 - x^(n+1)
- *     S_n := \Sum x^i = -------------
- *             i=0          1 - x
- */
-static unsigned long
-calc_load_n(unsigned long load, unsigned long exp,
-	    unsigned long active, unsigned int n)
-{
-
-	return calc_load(load, fixed_power_int(exp, FSHIFT, n), active);
-}
-
-/*
- * NO_HZ can leave us missing all per-cpu ticks calling
- * calc_load_account_active(), but since an idle CPU folds its delta into
- * calc_load_tasks_idle per calc_load_account_idle(), all we need to do is fold
- * in the pending idle delta if our idle period crossed a load cycle boundary.
- *
- * Once we've updated the global active value, we need to apply the exponential
- * weights adjusted to the number of cycles missed.
- */
-static void calc_global_nohz(void)
-{
-	long delta, active, n;
-
-	if (!time_before(jiffies, calc_load_update + 10)) {
-		/*
-		 * Catch-up, fold however many we are behind still
-		 */
-		delta = jiffies - calc_load_update - 10;
-		n = 1 + (delta / LOAD_FREQ);
-
-		active = atomic_long_read(&calc_load_tasks);
-		active = active > 0 ? active * FIXED_1 : 0;
-
-		avenrun[0] = calc_load_n(avenrun[0], EXP_1, active, n);
-		avenrun[1] = calc_load_n(avenrun[1], EXP_5, active, n);
-		avenrun[2] = calc_load_n(avenrun[2], EXP_15, active, n);
-
-		calc_load_update += n * LOAD_FREQ;
-	}
-
-	/*
-	 * Flip the idle index...
-	 *
-	 * Make sure we first write the new time then flip the index, so that
-	 * calc_load_write_idx() will see the new time when it reads the new
-	 * index, this avoids a double flip messing things up.
-	 */
-	smp_wmb();
-	calc_load_idx++;
-}
-#else /* !CONFIG_NO_HZ_COMMON */
-
-static inline long calc_load_fold_idle(void) { return 0; }
-static inline void calc_global_nohz(void) { }
-
-#endif /* CONFIG_NO_HZ_COMMON */
-
-/*
- * calc_load - update the avenrun load estimates 10 ticks after the
- * CPUs have updated calc_load_tasks.
- */
-void calc_global_load(unsigned long ticks)
-{
-	long active, delta;
-
-	if (time_before(jiffies, calc_load_update + 10))
-		return;
-
-	/*
-	 * Fold the 'old' idle-delta to include all NO_HZ cpus.
-	 */
-	delta = calc_load_fold_idle();
-	if (delta)
-		atomic_long_add(delta, &calc_load_tasks);
-
-	active = atomic_long_read(&calc_load_tasks);
-	active = active > 0 ? active * FIXED_1 : 0;
-
-	avenrun[0] = calc_load(avenrun[0], EXP_1, active);
-	avenrun[1] = calc_load(avenrun[1], EXP_5, active);
-	avenrun[2] = calc_load(avenrun[2], EXP_15, active);
-
-	calc_load_update += LOAD_FREQ;
-
-	/*
-	 * In case we idled for multiple LOAD_FREQ intervals, catch up in bulk.
-	 */
-	calc_global_nohz();
-}
-
-/*
- * Called from update_cpu_load() to periodically update this CPU's
- * active count.
- */
-static void calc_load_account_active(struct rq *this_rq)
-{
-	long delta;
-
-	if (time_before(jiffies, this_rq->calc_load_update))
-		return;
-
-	delta  = calc_load_fold_active(this_rq);
-	if (delta)
-		atomic_long_add(delta, &calc_load_tasks);
-
-	this_rq->calc_load_update += LOAD_FREQ;
-}
-
-/*
- * End of global load-average stuff
- */
-
-/*
- * The exact cpuload at various idx values, calculated at every tick would be
- * load = (2^idx - 1) / 2^idx * load + 1 / 2^idx * cur_load
- *
- * If a cpu misses updates for n-1 ticks (as it was idle) and update gets called
- * on nth tick when cpu may be busy, then we have:
- * load = ((2^idx - 1) / 2^idx)^(n-1) * load
- * load = (2^idx - 1) / 2^idx) * load + 1 / 2^idx * cur_load
- *
- * decay_load_missed() below does efficient calculation of
- * load = ((2^idx - 1) / 2^idx)^(n-1) * load
- * avoiding 0..n-1 loop doing load = ((2^idx - 1) / 2^idx) * load
- *
- * The calculation is approximated on a 128 point scale.
- * degrade_zero_ticks is the number of ticks after which load at any
- * particular idx is approximated to be zero.
- * degrade_factor is a precomputed table, a row for each load idx.
- * Each column corresponds to degradation factor for a power of two ticks,
- * based on 128 point scale.
- * Example:
- * row 2, col 3 (=12) says that the degradation at load idx 2 after
- * 8 ticks is 12/128 (which is an approximation of exact factor 3^8/4^8).
- *
- * With this power of 2 load factors, we can degrade the load n times
- * by looking at 1 bits in n and doing as many mult/shift instead of
- * n mult/shifts needed by the exact degradation.
- */
-#define DEGRADE_SHIFT		7
-static const unsigned char
-		degrade_zero_ticks[CPU_LOAD_IDX_MAX] = {0, 8, 32, 64, 128};
-static const unsigned char
-		degrade_factor[CPU_LOAD_IDX_MAX][DEGRADE_SHIFT + 1] = {
-					{0, 0, 0, 0, 0, 0, 0, 0},
-					{64, 32, 8, 0, 0, 0, 0, 0},
-					{96, 72, 40, 12, 1, 0, 0},
-					{112, 98, 75, 43, 15, 1, 0},
-					{120, 112, 98, 76, 45, 16, 2} };
-
-/*
- * Update cpu_load for any missed ticks, due to tickless idle. The backlog
- * would be when CPU is idle and so we just decay the old load without
- * adding any new load.
- */
-static unsigned long
-decay_load_missed(unsigned long load, unsigned long missed_updates, int idx)
-{
-	int j = 0;
-
-	if (!missed_updates)
-		return load;
-
-	if (missed_updates >= degrade_zero_ticks[idx])
-		return 0;
-
-	if (idx == 1)
-		return load >> missed_updates;
-
-	while (missed_updates) {
-		if (missed_updates % 2)
-			load = (load * degrade_factor[idx][j]) >> DEGRADE_SHIFT;
-
-		missed_updates >>= 1;
-		j++;
-	}
-	return load;
-}
-
-/*
- * Update rq->cpu_load[] statistics. This function is usually called every
- * scheduler tick (TICK_NSEC). With tickless idle this will not be called
- * every tick. We fix it up based on jiffies.
- */
-static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
-			      unsigned long pending_updates)
-{
-	int i, scale;
-
-	this_rq->nr_load_updates++;
-
-	/* Update our load: */
-	this_rq->cpu_load[0] = this_load; /* Fasttrack for idx 0 */
-	for (i = 1, scale = 2; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
-		unsigned long old_load, new_load;
-
-		/* scale is effectively 1 << i now, and >> i divides by scale */
-
-		old_load = this_rq->cpu_load[i];
-		old_load = decay_load_missed(old_load, pending_updates - 1, i);
-		new_load = this_load;
-		/*
-		 * Round up the averaging division if load is increasing. This
-		 * prevents us from getting stuck on 9 if the load is 10, for
-		 * example.
-		 */
-		if (new_load > old_load)
-			new_load += scale - 1;
-
-		this_rq->cpu_load[i] = (old_load * (scale - 1) + new_load) >> i;
-	}
-
-	sched_avg_update(this_rq);
-}
-
-#ifdef CONFIG_NO_HZ_COMMON
-/*
- * There is no sane way to deal with nohz on smp when using jiffies because the
- * cpu doing the jiffies update might drift wrt the cpu doing the jiffy reading
- * causing off-by-one errors in observed deltas; {0,2} instead of {1,1}.
- *
- * Therefore we cannot use the delta approach from the regular tick since that
- * would seriously skew the load calculation. However we'll make do for those
- * updates happening while idle (nohz_idle_balance) or coming out of idle
- * (tick_nohz_idle_exit).
- *
- * This means we might still be one tick off for nohz periods.
- */
-
-/*
- * Called from nohz_idle_balance() to update the load ratings before doing the
- * idle balance.
- */
-void update_idle_cpu_load(struct rq *this_rq)
-{
-	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
-	unsigned long load = this_rq->load.weight;
-	unsigned long pending_updates;
-
-	/*
-	 * bail if there's load or we're actually up-to-date.
-	 */
-	if (load || curr_jiffies == this_rq->last_load_update_tick)
-		return;
-
-	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
-	this_rq->last_load_update_tick = curr_jiffies;
-
-	__update_cpu_load(this_rq, load, pending_updates);
-}
-
-/*
- * Called from tick_nohz_idle_exit() -- try and fix up the ticks we missed.
- */
-void update_cpu_load_nohz(void)
-{
-	struct rq *this_rq = this_rq();
-	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
-	unsigned long pending_updates;
-
-	if (curr_jiffies == this_rq->last_load_update_tick)
-		return;
-
-	raw_spin_lock(&this_rq->lock);
-	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
-	if (pending_updates) {
-		this_rq->last_load_update_tick = curr_jiffies;
-		/*
-		 * We were idle, this means load 0, the current load might be
-		 * !0 due to remote wakeups and the sort.
-		 */
-		__update_cpu_load(this_rq, 0, pending_updates);
-	}
-	raw_spin_unlock(&this_rq->lock);
-}
-#endif /* CONFIG_NO_HZ_COMMON */
-
-/*
- * Called from scheduler_tick()
- */
-static void update_cpu_load_active(struct rq *this_rq)
-{
-	/*
-	 * See the mess around update_idle_cpu_load() / update_cpu_load_nohz().
-	 */
-	this_rq->last_load_update_tick = jiffies;
-	__update_cpu_load(this_rq, this_rq->load.weight, 1);
-
-	calc_load_account_active(this_rq);
-}
-
 #ifdef CONFIG_SMP
 
 /*
@@ -2686,7 +2112,7 @@ static u64 do_task_delta_exec(struct task_struct *p, struct rq *rq)
 
 	if (task_current(rq, p)) {
 		update_rq_clock(rq);
-		ns = rq->clock_task - p->se.exec_start;
+		ns = rq_clock_task(rq) - p->se.exec_start;
 		if ((s64)ns < 0)
 			ns = 0;
 	}
@@ -2739,8 +2165,8 @@ void scheduler_tick(void)
 
 	raw_spin_lock(&rq->lock);
 	update_rq_clock(rq);
-	update_cpu_load_active(rq);
 	curr->sched_class->task_tick(rq, curr, 0);
+	update_cpu_load_active(rq);
 	raw_spin_unlock(&rq->lock);
 
 	perf_event_task_tick();
@@ -4960,6 +4386,13 @@ static void migrate_tasks(unsigned int dead_cpu)
 	 */
 	rq->stop = NULL;
 
+	/*
+	 * put_prev_task() and pick_next_task() sched
+	 * class method both need to have an up-to-date
+	 * value of rq->clock[_task]
+	 */
+	update_rq_clock(rq);
+
 	for ( ; ; ) {
 		/*
 		 * There's this thread running, bail when that's the only
@@ -5093,7 +4526,7 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
 	return table;
 }
 
-static ctl_table *sd_alloc_ctl_cpu_table(int cpu)
+static struct ctl_table *sd_alloc_ctl_cpu_table(int cpu)
 {
 	struct ctl_table *entry, *table;
 	struct sched_domain *sd;
@@ -5907,7 +5340,7 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 	get_group(cpu, sdd, &sd->groups);
 	atomic_inc(&sd->groups->ref);
 
-	if (cpu != cpumask_first(sched_domain_span(sd)))
+	if (cpu != cpumask_first(span))
 		return 0;
 
 	lockdep_assert_held(&sched_domains_mutex);
@@ -5917,12 +5350,12 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 
 	for_each_cpu(i, span) {
 		struct sched_group *sg;
-		int group = get_group(i, sdd, &sg);
-		int j;
+		int group, j;
 
 		if (cpumask_test_cpu(i, covered))
 			continue;
 
+		group = get_group(i, sdd, &sg);
 		cpumask_clear(sched_group_cpus(sg));
 		sg->sgp->power = 0;
 		cpumask_setall(sched_group_mask(sg));
@@ -5960,7 +5393,7 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
 {
 	struct sched_group *sg = sd->groups;
 
-	WARN_ON(!sd || !sg);
+	WARN_ON(!sg);
 
 	do {
 		sg->group_weight = cpumask_weight(sched_group_cpus(sg));
@@ -6125,6 +5558,9 @@ static struct sched_domain_topology_level default_topology[] = {
 
 static struct sched_domain_topology_level *sched_domain_topology = default_topology;
 
+#define for_each_sd_topology(tl)			\
+	for (tl = sched_domain_topology; tl->init; tl++)
+
 #ifdef CONFIG_NUMA
 
 static int sched_domains_numa_levels;
@@ -6422,7 +5858,7 @@ static int __sdt_alloc(const struct cpumask *cpu_map)
 	struct sched_domain_topology_level *tl;
 	int j;
 
-	for (tl = sched_domain_topology; tl->init; tl++) {
+	for_each_sd_topology(tl) {
 		struct sd_data *sdd = &tl->data;
 
 		sdd->sd = alloc_percpu(struct sched_domain *);
@@ -6475,7 +5911,7 @@ static void __sdt_free(const struct cpumask *cpu_map)
 	struct sched_domain_topology_level *tl;
 	int j;
 
-	for (tl = sched_domain_topology; tl->init; tl++) {
+	for_each_sd_topology(tl) {
 		struct sd_data *sdd = &tl->data;
 
 		for_each_cpu(j, cpu_map) {
@@ -6503,9 +5939,8 @@ static void __sdt_free(const struct cpumask *cpu_map)
 }
 
 struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
-		struct s_data *d, const struct cpumask *cpu_map,
-		struct sched_domain_attr *attr, struct sched_domain *child,
-		int cpu)
+		const struct cpumask *cpu_map, struct sched_domain_attr *attr,
+		struct sched_domain *child, int cpu)
 {
 	struct sched_domain *sd = tl->init(tl, cpu);
 	if (!sd)
@@ -6516,8 +5951,8 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 		sd->level = child->level + 1;
 		sched_domain_level_max = max(sched_domain_level_max, sd->level);
 		child->parent = sd;
+		sd->child = child;
 	}
-	sd->child = child;
 	set_domain_attribute(sd, attr);
 
 	return sd;
@@ -6530,7 +5965,7 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 static int build_sched_domains(const struct cpumask *cpu_map,
 			       struct sched_domain_attr *attr)
 {
-	enum s_alloc alloc_state = sa_none;
+	enum s_alloc alloc_state;
 	struct sched_domain *sd;
 	struct s_data d;
 	int i, ret = -ENOMEM;
@@ -6544,18 +5979,15 @@ static int build_sched_domains(const struct cpumask *cpu_map,
 		struct sched_domain_topology_level *tl;
 
 		sd = NULL;
-		for (tl = sched_domain_topology; tl->init; tl++) {
-			sd = build_sched_domain(tl, &d, cpu_map, attr, sd, i);
+		for_each_sd_topology(tl) {
+			sd = build_sched_domain(tl, cpu_map, attr, sd, i);
+			if (tl == sched_domain_topology)
+				*per_cpu_ptr(d.sd, i) = sd;
 			if (tl->flags & SDTL_OVERLAP || sched_feat(FORCE_SD_OVERLAP))
 				sd->flags |= SD_OVERLAP;
 			if (cpumask_equal(cpu_map, sched_domain_span(sd)))
 				break;
 		}
-
-		while (sd->child)
-			sd = sd->child;
-
-		*per_cpu_ptr(d.sd, i) = sd;
 	}
 
 	/* Build the groups for the domains */
@@ -6867,9 +6299,6 @@ void __init sched_init_smp(void)
 	hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
 	hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
 
-	/* RT runtime code needs to handle some hotplug events */
-	hotcpu_notifier(update_runtime, 0);
-
 	init_hrtick();
 
 	/* Move init over to a non-isolated CPU */
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index b5ccba22603b..a7959e05a9d5 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -515,9 +515,8 @@ static cputime_t scale_stime(u64 stime, u64 rtime, u64 total)
 
 	for (;;) {
 		/* Make sure "rtime" is the bigger of stime/rtime */
-		if (stime > rtime) {
-			u64 tmp = rtime; rtime = stime; stime = tmp;
-		}
+		if (stime > rtime)
+			swap(rtime, stime);
 
 		/* Make sure 'total' fits in 32 bits */
 		if (total >> 32)
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 75024a673520..e076bddd4c66 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -209,22 +209,24 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
 			cfs_rq->nr_spread_over);
 	SEQ_printf(m, "  .%-30s: %d\n", "nr_running", cfs_rq->nr_running);
 	SEQ_printf(m, "  .%-30s: %ld\n", "load", cfs_rq->load.weight);
-#ifdef CONFIG_FAIR_GROUP_SCHED
 #ifdef CONFIG_SMP
-	SEQ_printf(m, "  .%-30s: %lld\n", "runnable_load_avg",
+	SEQ_printf(m, "  .%-30s: %ld\n", "runnable_load_avg",
 			cfs_rq->runnable_load_avg);
-	SEQ_printf(m, "  .%-30s: %lld\n", "blocked_load_avg",
+	SEQ_printf(m, "  .%-30s: %ld\n", "blocked_load_avg",
 			cfs_rq->blocked_load_avg);
-	SEQ_printf(m, "  .%-30s: %lld\n", "tg_load_avg",
-			(unsigned long long)atomic64_read(&cfs_rq->tg->load_avg));
-	SEQ_printf(m, "  .%-30s: %lld\n", "tg_load_contrib",
+#ifdef CONFIG_FAIR_GROUP_SCHED
+	SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_contrib",
 			cfs_rq->tg_load_contrib);
 	SEQ_printf(m, "  .%-30s: %d\n", "tg_runnable_contrib",
 			cfs_rq->tg_runnable_contrib);
+	SEQ_printf(m, "  .%-30s: %ld\n", "tg_load_avg",
+			atomic_long_read(&cfs_rq->tg->load_avg));
 	SEQ_printf(m, "  .%-30s: %d\n", "tg->runnable_avg",
 			atomic_read(&cfs_rq->tg->runnable_avg));
 #endif
+#endif
 
+#ifdef CONFIG_FAIR_GROUP_SCHED
 	print_cfs_group_stats(m, cpu, cfs_rq->tg);
 #endif
 }
@@ -493,15 +495,16 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 	SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid,
 						get_nr_threads(p));
 	SEQ_printf(m,
-		"---------------------------------------------------------\n");
+		"---------------------------------------------------------"
+		"----------\n");
 #define __P(F) \
-	SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)F)
+	SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)F)
 #define P(F) \
-	SEQ_printf(m, "%-35s:%21Ld\n", #F, (long long)p->F)
+	SEQ_printf(m, "%-45s:%21Ld\n", #F, (long long)p->F)
 #define __PN(F) \
-	SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
+	SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)F))
 #define PN(F) \
-	SEQ_printf(m, "%-35s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
+	SEQ_printf(m, "%-45s:%14Ld.%06ld\n", #F, SPLIT_NS((long long)p->F))
 
 	PN(se.exec_start);
 	PN(se.vruntime);
@@ -560,12 +563,18 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 	}
 #endif
 	__P(nr_switches);
-	SEQ_printf(m, "%-35s:%21Ld\n",
+	SEQ_printf(m, "%-45s:%21Ld\n",
 		   "nr_voluntary_switches", (long long)p->nvcsw);
-	SEQ_printf(m, "%-35s:%21Ld\n",
+	SEQ_printf(m, "%-45s:%21Ld\n",
 		   "nr_involuntary_switches", (long long)p->nivcsw);
 
 	P(se.load.weight);
+#ifdef CONFIG_SMP
+	P(se.avg.runnable_avg_sum);
+	P(se.avg.runnable_avg_period);
+	P(se.avg.load_avg_contrib);
+	P(se.avg.decay_count);
+#endif
 	P(policy);
 	P(prio);
 #undef PN
@@ -579,7 +588,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 
 		t0 = cpu_clock(this_cpu);
 		t1 = cpu_clock(this_cpu);
-		SEQ_printf(m, "%-35s:%21Ld\n",
+		SEQ_printf(m, "%-45s:%21Ld\n",
 			   "clock-delta", (long long)(t1-t0));
 	}
 }
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c61a614465c8..f77f9c527449 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -113,6 +113,24 @@ unsigned int __read_mostly sysctl_sched_shares_window = 10000000UL;
 unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
 #endif
 
+static inline void update_load_add(struct load_weight *lw, unsigned long inc)
+{
+	lw->weight += inc;
+	lw->inv_weight = 0;
+}
+
+static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
+{
+	lw->weight -= dec;
+	lw->inv_weight = 0;
+}
+
+static inline void update_load_set(struct load_weight *lw, unsigned long w)
+{
+	lw->weight = w;
+	lw->inv_weight = 0;
+}
+
 /*
  * Increase the granularity value when there are more CPUs,
  * because with more CPUs the 'effective latency' as visible
@@ -662,6 +680,26 @@ static u64 sched_vslice(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	return calc_delta_fair(sched_slice(cfs_rq, se), se);
 }
 
+#ifdef CONFIG_SMP
+static inline void __update_task_entity_contrib(struct sched_entity *se);
+
+/* Give new task start runnable values to heavy its load in infant time */
+void init_task_runnable_average(struct task_struct *p)
+{
+	u32 slice;
+
+	p->se.avg.decay_count = 0;
+	slice = sched_slice(task_cfs_rq(p), &p->se) >> 10;
+	p->se.avg.runnable_avg_sum = slice;
+	p->se.avg.runnable_avg_period = slice;
+	__update_task_entity_contrib(&p->se);
+}
+#else
+void init_task_runnable_average(struct task_struct *p)
+{
+}
+#endif
+
 /*
  * Update the current task's runtime statistics. Skip current tasks that
  * are not in our scheduling class.
@@ -686,7 +724,7 @@ __update_curr(struct cfs_rq *cfs_rq, struct sched_entity *curr,
 static void update_curr(struct cfs_rq *cfs_rq)
 {
 	struct sched_entity *curr = cfs_rq->curr;
-	u64 now = rq_of(cfs_rq)->clock_task;
+	u64 now = rq_clock_task(rq_of(cfs_rq));
 	unsigned long delta_exec;
 
 	if (unlikely(!curr))
@@ -718,7 +756,7 @@ static void update_curr(struct cfs_rq *cfs_rq)
 static inline void
 update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	schedstat_set(se->statistics.wait_start, rq_of(cfs_rq)->clock);
+	schedstat_set(se->statistics.wait_start, rq_clock(rq_of(cfs_rq)));
 }
 
 /*
@@ -738,14 +776,14 @@ static void
 update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 	schedstat_set(se->statistics.wait_max, max(se->statistics.wait_max,
-			rq_of(cfs_rq)->clock - se->statistics.wait_start));
+			rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start));
 	schedstat_set(se->statistics.wait_count, se->statistics.wait_count + 1);
 	schedstat_set(se->statistics.wait_sum, se->statistics.wait_sum +
-			rq_of(cfs_rq)->clock - se->statistics.wait_start);
+			rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start);
 #ifdef CONFIG_SCHEDSTATS
 	if (entity_is_task(se)) {
 		trace_sched_stat_wait(task_of(se),
-			rq_of(cfs_rq)->clock - se->statistics.wait_start);
+			rq_clock(rq_of(cfs_rq)) - se->statistics.wait_start);
 	}
 #endif
 	schedstat_set(se->statistics.wait_start, 0);
@@ -771,7 +809,7 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	/*
 	 * We are starting a new run period:
 	 */
-	se->exec_start = rq_of(cfs_rq)->clock_task;
+	se->exec_start = rq_clock_task(rq_of(cfs_rq));
 }
 
 /**************************************************
@@ -1037,7 +1075,7 @@ static inline long calc_tg_weight(struct task_group *tg, struct cfs_rq *cfs_rq)
 	 * to gain a more accurate current total weight. See
 	 * update_cfs_rq_load_contribution().
 	 */
-	tg_weight = atomic64_read(&tg->load_avg);
+	tg_weight = atomic_long_read(&tg->load_avg);
 	tg_weight -= cfs_rq->tg_load_contrib;
 	tg_weight += cfs_rq->load.weight;
 
@@ -1110,8 +1148,7 @@ static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
 }
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
-/* Only depends on SMP, FAIR_GROUP_SCHED may be removed when useful in lb */
-#if defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)
+#ifdef CONFIG_SMP
 /*
  * We choose a half-life close to 1 scheduling period.
  * Note: The tables below are dependent on this value.
@@ -1319,13 +1356,13 @@ static inline void __update_cfs_rq_tg_load_contrib(struct cfs_rq *cfs_rq,
 						 int force_update)
 {
 	struct task_group *tg = cfs_rq->tg;
-	s64 tg_contrib;
+	long tg_contrib;
 
 	tg_contrib = cfs_rq->runnable_load_avg + cfs_rq->blocked_load_avg;
 	tg_contrib -= cfs_rq->tg_load_contrib;
 
-	if (force_update || abs64(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
-		atomic64_add(tg_contrib, &tg->load_avg);
+	if (force_update || abs(tg_contrib) > cfs_rq->tg_load_contrib / 8) {
+		atomic_long_add(tg_contrib, &tg->load_avg);
 		cfs_rq->tg_load_contrib += tg_contrib;
 	}
 }
@@ -1360,8 +1397,8 @@ static inline void __update_group_entity_contrib(struct sched_entity *se)
 	u64 contrib;
 
 	contrib = cfs_rq->tg_load_contrib * tg->shares;
-	se->avg.load_avg_contrib = div64_u64(contrib,
-					     atomic64_read(&tg->load_avg) + 1);
+	se->avg.load_avg_contrib = div_u64(contrib,
+				     atomic_long_read(&tg->load_avg) + 1);
 
 	/*
 	 * For group entities we need to compute a correction term in the case
@@ -1480,8 +1517,9 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
 	if (!decays && !force_update)
 		return;
 
-	if (atomic64_read(&cfs_rq->removed_load)) {
-		u64 removed_load = atomic64_xchg(&cfs_rq->removed_load, 0);
+	if (atomic_long_read(&cfs_rq->removed_load)) {
+		unsigned long removed_load;
+		removed_load = atomic_long_xchg(&cfs_rq->removed_load, 0);
 		subtract_blocked_load_contrib(cfs_rq, removed_load);
 	}
 
@@ -1497,7 +1535,7 @@ static void update_cfs_rq_blocked_load(struct cfs_rq *cfs_rq, int force_update)
 
 static inline void update_rq_runnable_avg(struct rq *rq, int runnable)
 {
-	__update_entity_runnable_avg(rq->clock_task, &rq->avg, runnable);
+	__update_entity_runnable_avg(rq_clock_task(rq), &rq->avg, runnable);
 	__update_tg_runnable_avg(&rq->avg, &rq->cfs);
 }
 
@@ -1510,9 +1548,13 @@ static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
 	 * We track migrations using entity decay_count <= 0, on a wake-up
 	 * migration we use a negative decay count to track the remote decays
 	 * accumulated while sleeping.
+	 *
+	 * Newly forked tasks are enqueued with se->avg.decay_count == 0, they
+	 * are seen by enqueue_entity_load_avg() as a migration with an already
+	 * constructed load_avg_contrib.
 	 */
 	if (unlikely(se->avg.decay_count <= 0)) {
-		se->avg.last_runnable_update = rq_of(cfs_rq)->clock_task;
+		se->avg.last_runnable_update = rq_clock_task(rq_of(cfs_rq));
 		if (se->avg.decay_count) {
 			/*
 			 * In a wake-up migration we have to approximate the
@@ -1530,7 +1572,13 @@ static inline void enqueue_entity_load_avg(struct cfs_rq *cfs_rq,
 		}
 		wakeup = 0;
 	} else {
-		__synchronize_entity_decay(se);
+		/*
+		 * Task re-woke on same cpu (or else migrate_task_rq_fair()
+		 * would have made count negative); we must be careful to avoid
+		 * double-accounting blocked time after synchronizing decays.
+		 */
+		se->avg.last_runnable_update += __synchronize_entity_decay(se)
+							<< 20;
 	}
 
 	/* migrated tasks did not contribute to our blocked load */
@@ -1607,7 +1655,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 		tsk = task_of(se);
 
 	if (se->statistics.sleep_start) {
-		u64 delta = rq_of(cfs_rq)->clock - se->statistics.sleep_start;
+		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.sleep_start;
 
 		if ((s64)delta < 0)
 			delta = 0;
@@ -1624,7 +1672,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
 		}
 	}
 	if (se->statistics.block_start) {
-		u64 delta = rq_of(cfs_rq)->clock - se->statistics.block_start;
+		u64 delta = rq_clock(rq_of(cfs_rq)) - se->statistics.block_start;
 
 		if ((s64)delta < 0)
 			delta = 0;
@@ -1712,7 +1760,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
 	/*
 	 * Update the normalized vruntime before updating min_vruntime
-	 * through callig update_curr().
+	 * through calling update_curr().
 	 */
 	if (!(flags & ENQUEUE_WAKEUP) || (flags & ENQUEUE_WAKING))
 		se->vruntime += cfs_rq->min_vruntime;
@@ -1805,9 +1853,9 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 			struct task_struct *tsk = task_of(se);
 
 			if (tsk->state & TASK_INTERRUPTIBLE)
-				se->statistics.sleep_start = rq_of(cfs_rq)->clock;
+				se->statistics.sleep_start = rq_clock(rq_of(cfs_rq));
 			if (tsk->state & TASK_UNINTERRUPTIBLE)
-				se->statistics.block_start = rq_of(cfs_rq)->clock;
+				se->statistics.block_start = rq_clock(rq_of(cfs_rq));
 		}
 #endif
 	}
@@ -2082,7 +2130,7 @@ static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
 	if (unlikely(cfs_rq->throttle_count))
 		return cfs_rq->throttled_clock_task;
 
-	return rq_of(cfs_rq)->clock_task - cfs_rq->throttled_clock_task_time;
+	return rq_clock_task(rq_of(cfs_rq)) - cfs_rq->throttled_clock_task_time;
 }
 
 /* returns 0 on failure to allocate runtime */
@@ -2138,10 +2186,9 @@ static int assign_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 static void expire_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 {
 	struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(cfs_rq->tg);
-	struct rq *rq = rq_of(cfs_rq);
 
 	/* if the deadline is ahead of our clock, nothing to do */
-	if (likely((s64)(rq->clock - cfs_rq->runtime_expires) < 0))
+	if (likely((s64)(rq_clock(rq_of(cfs_rq)) - cfs_rq->runtime_expires) < 0))
 		return;
 
 	if (cfs_rq->runtime_remaining < 0)
@@ -2230,7 +2277,7 @@ static int tg_unthrottle_up(struct task_group *tg, void *data)
 #ifdef CONFIG_SMP
 	if (!cfs_rq->throttle_count) {
 		/* adjust cfs_rq_clock_task() */
-		cfs_rq->throttled_clock_task_time += rq->clock_task -
+		cfs_rq->throttled_clock_task_time += rq_clock_task(rq) -
 					     cfs_rq->throttled_clock_task;
 	}
 #endif
@@ -2245,7 +2292,7 @@ static int tg_throttle_down(struct task_group *tg, void *data)
 
 	/* group is entering throttled state, stop time */
 	if (!cfs_rq->throttle_count)
-		cfs_rq->throttled_clock_task = rq->clock_task;
+		cfs_rq->throttled_clock_task = rq_clock_task(rq);
 	cfs_rq->throttle_count++;
 
 	return 0;
@@ -2284,7 +2331,7 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq)
 		rq->nr_running -= task_delta;
 
 	cfs_rq->throttled = 1;
-	cfs_rq->throttled_clock = rq->clock;
+	cfs_rq->throttled_clock = rq_clock(rq);
 	raw_spin_lock(&cfs_b->lock);
 	list_add_tail_rcu(&cfs_rq->throttled_list, &cfs_b->throttled_cfs_rq);
 	raw_spin_unlock(&cfs_b->lock);
@@ -2298,15 +2345,17 @@ void unthrottle_cfs_rq(struct cfs_rq *cfs_rq)
 	int enqueue = 1;
 	long task_delta;
 
-	se = cfs_rq->tg->se[cpu_of(rq_of(cfs_rq))];
+	se = cfs_rq->tg->se[cpu_of(rq)];
 
 	cfs_rq->throttled = 0;
+
+	update_rq_clock(rq);
+
 	raw_spin_lock(&cfs_b->lock);
-	cfs_b->throttled_time += rq->clock - cfs_rq->throttled_clock;
+	cfs_b->throttled_time += rq_clock(rq) - cfs_rq->throttled_clock;
 	list_del_rcu(&cfs_rq->throttled_list);
 	raw_spin_unlock(&cfs_b->lock);
 
-	update_rq_clock(rq);
 	/* update hierarchical throttle state */
 	walk_tg_tree_from(cfs_rq->tg, tg_nop, tg_unthrottle_up, (void *)rq);
 
@@ -2599,10 +2648,6 @@ static void check_cfs_rq_runtime(struct cfs_rq *cfs_rq)
 	throttle_cfs_rq(cfs_rq);
 }
 
-static inline u64 default_cfs_period(void);
-static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun);
-static void do_sched_cfs_slack_timer(struct cfs_bandwidth *cfs_b);
-
 static enum hrtimer_restart sched_cfs_slack_timer(struct hrtimer *timer)
 {
 	struct cfs_bandwidth *cfs_b =
@@ -2706,7 +2751,7 @@ static void __maybe_unused unthrottle_offline_cfs_rqs(struct rq *rq)
 #else /* CONFIG_CFS_BANDWIDTH */
 static inline u64 cfs_rq_clock_task(struct cfs_rq *cfs_rq)
 {
-	return rq_of(cfs_rq)->clock_task;
+	return rq_clock_task(rq_of(cfs_rq));
 }
 
 static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq,
@@ -2919,7 +2964,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 /* Used instead of source_load when we know the type == 0 */
 static unsigned long weighted_cpuload(const int cpu)
 {
-	return cpu_rq(cpu)->load.weight;
+	return cpu_rq(cpu)->cfs.runnable_load_avg;
 }
 
 /*
@@ -2964,9 +3009,10 @@ static unsigned long cpu_avg_load_per_task(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
 	unsigned long nr_running = ACCESS_ONCE(rq->nr_running);
+	unsigned long load_avg = rq->cfs.runnable_load_avg;
 
 	if (nr_running)
-		return rq->load.weight / nr_running;
+		return load_avg / nr_running;
 
 	return 0;
 }
@@ -3416,12 +3462,6 @@ unlock:
 }
 
 /*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
-/*
  * Called immediately before a task is migrated to a new cpu; task_cpu(p) and
  * cfs_rq_of(p) references at time of call are still valid and identify the
  * previous cpu.  However, the caller only guarantees p->pi_lock is held; no
@@ -3441,10 +3481,10 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
 	 */
 	if (se->avg.decay_count) {
 		se->avg.decay_count = -__synchronize_entity_decay(se);
-		atomic64_add(se->avg.load_avg_contrib, &cfs_rq->removed_load);
+		atomic_long_add(se->avg.load_avg_contrib,
+						&cfs_rq->removed_load);
 	}
 }
-#endif
 #endif /* CONFIG_SMP */
 
 static unsigned long
@@ -3946,7 +3986,7 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
 	 * 2) too many balance attempts have failed.
 	 */
 
-	tsk_cache_hot = task_hot(p, env->src_rq->clock_task, env->sd);
+	tsk_cache_hot = task_hot(p, rq_clock_task(env->src_rq), env->sd);
 	if (!tsk_cache_hot ||
 		env->sd->nr_balance_failed > env->sd->cache_nice_tries) {
 
@@ -4141,11 +4181,11 @@ static int tg_load_down(struct task_group *tg, void *data)
 	long cpu = (long)data;
 
 	if (!tg->parent) {
-		load = cpu_rq(cpu)->load.weight;
+		load = cpu_rq(cpu)->avg.load_avg_contrib;
 	} else {
 		load = tg->parent->cfs_rq[cpu]->h_load;
-		load *= tg->se[cpu]->load.weight;
-		load /= tg->parent->cfs_rq[cpu]->load.weight + 1;
+		load = div64_ul(load * tg->se[cpu]->avg.load_avg_contrib,
+				tg->parent->cfs_rq[cpu]->runnable_load_avg + 1);
 	}
 
 	tg->cfs_rq[cpu]->h_load = load;
@@ -4171,12 +4211,9 @@ static void update_h_load(long cpu)
 static unsigned long task_h_load(struct task_struct *p)
 {
 	struct cfs_rq *cfs_rq = task_cfs_rq(p);
-	unsigned long load;
-
-	load = p->se.load.weight;
-	load = div_u64(load * cfs_rq->h_load, cfs_rq->load.weight + 1);
 
-	return load;
+	return div64_ul(p->se.avg.load_avg_contrib * cfs_rq->h_load,
+			cfs_rq->runnable_load_avg + 1);
 }
 #else
 static inline void update_blocked_averages(int cpu)
@@ -4189,7 +4226,7 @@ static inline void update_h_load(long cpu)
 
 static unsigned long task_h_load(struct task_struct *p)
 {
-	return p->se.load.weight;
+	return p->se.avg.load_avg_contrib;
 }
 #endif
 
@@ -4302,7 +4339,7 @@ static unsigned long scale_rt_power(int cpu)
 	age_stamp = ACCESS_ONCE(rq->age_stamp);
 	avg = ACCESS_ONCE(rq->rt_avg);
 
-	total = sched_avg_period() + (rq->clock - age_stamp);
+	total = sched_avg_period() + (rq_clock(rq) - age_stamp);
 
 	if (unlikely(total < avg)) {
 		/* Ensures that power won't end up being negative */
@@ -5241,7 +5278,7 @@ void idle_balance(int this_cpu, struct rq *this_rq)
 	int pulled_task = 0;
 	unsigned long next_balance = jiffies + HZ;
 
-	this_rq->idle_stamp = this_rq->clock;
+	this_rq->idle_stamp = rq_clock(this_rq);
 
 	if (this_rq->avg_idle < sysctl_sched_migration_cost)
 		return;
@@ -5418,10 +5455,9 @@ static inline void nohz_balance_exit_idle(int cpu)
 static inline void set_cpu_sd_state_busy(void)
 {
 	struct sched_domain *sd;
-	int cpu = smp_processor_id();
 
 	rcu_read_lock();
-	sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd);
+	sd = rcu_dereference_check_sched_domain(this_rq()->sd);
 
 	if (!sd || !sd->nohz_idle)
 		goto unlock;
@@ -5436,10 +5472,9 @@ unlock:
 void set_cpu_sd_state_idle(void)
 {
 	struct sched_domain *sd;
-	int cpu = smp_processor_id();
 
 	rcu_read_lock();
-	sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd);
+	sd = rcu_dereference_check_sched_domain(this_rq()->sd);
 
 	if (!sd || sd->nohz_idle)
 		goto unlock;
@@ -5848,7 +5883,7 @@ static void switched_from_fair(struct rq *rq, struct task_struct *p)
 		se->vruntime -= cfs_rq->min_vruntime;
 	}
 
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
 	/*
 	* Remove our load from contribution when we leave sched_fair
 	* and ensure we don't carry in an old decay_count if we
@@ -5907,9 +5942,9 @@ void init_cfs_rq(struct cfs_rq *cfs_rq)
 #ifndef CONFIG_64BIT
 	cfs_rq->min_vruntime_copy = cfs_rq->min_vruntime;
 #endif
-#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
+#ifdef CONFIG_SMP
 	atomic64_set(&cfs_rq->decay_counter, 1);
-	atomic64_set(&cfs_rq->removed_load, 0);
+	atomic_long_set(&cfs_rq->removed_load, 0);
 #endif
 }
 
@@ -6091,6 +6126,9 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
 		se = tg->se[i];
 		/* Propagate contribution to hierarchy */
 		raw_spin_lock_irqsave(&rq->lock, flags);
+
+		/* Possible calls to update_curr() need rq clock */
+		update_rq_clock(rq);
 		for_each_sched_entity(se)
 			update_cfs_shares(group_cfs_rq(se));
 		raw_spin_unlock_irqrestore(&rq->lock, flags);
@@ -6146,9 +6184,8 @@ const struct sched_class fair_sched_class = {
 
 #ifdef CONFIG_SMP
 	.select_task_rq		= select_task_rq_fair,
-#ifdef CONFIG_FAIR_GROUP_SCHED
 	.migrate_task_rq	= migrate_task_rq_fair,
-#endif
+
 	.rq_online		= rq_online_fair,
 	.rq_offline		= rq_offline_fair,
 
diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c
new file mode 100644
index 000000000000..16f5a30f9c88
--- /dev/null
+++ b/kernel/sched/proc.c
@@ -0,0 +1,591 @@
+/*
+ *  kernel/sched/proc.c
+ *
+ *  Kernel load calculations, forked from sched/core.c
+ */
+
+#include <linux/export.h>
+
+#include "sched.h"
+
+unsigned long this_cpu_load(void)
+{
+	struct rq *this = this_rq();
+	return this->cpu_load[0];
+}
+
+
+/*
+ * Global load-average calculations
+ *
+ * We take a distributed and async approach to calculating the global load-avg
+ * in order to minimize overhead.
+ *
+ * The global load average is an exponentially decaying average of nr_running +
+ * nr_uninterruptible.
+ *
+ * Once every LOAD_FREQ:
+ *
+ *   nr_active = 0;
+ *   for_each_possible_cpu(cpu)
+ *	nr_active += cpu_of(cpu)->nr_running + cpu_of(cpu)->nr_uninterruptible;
+ *
+ *   avenrun[n] = avenrun[0] * exp_n + nr_active * (1 - exp_n)
+ *
+ * Due to a number of reasons the above turns in the mess below:
+ *
+ *  - for_each_possible_cpu() is prohibitively expensive on machines with
+ *    serious number of cpus, therefore we need to take a distributed approach
+ *    to calculating nr_active.
+ *
+ *        \Sum_i x_i(t) = \Sum_i x_i(t) - x_i(t_0) | x_i(t_0) := 0
+ *                      = \Sum_i { \Sum_j=1 x_i(t_j) - x_i(t_j-1) }
+ *
+ *    So assuming nr_active := 0 when we start out -- true per definition, we
+ *    can simply take per-cpu deltas and fold those into a global accumulate
+ *    to obtain the same result. See calc_load_fold_active().
+ *
+ *    Furthermore, in order to avoid synchronizing all per-cpu delta folding
+ *    across the machine, we assume 10 ticks is sufficient time for every
+ *    cpu to have completed this task.
+ *
+ *    This places an upper-bound on the IRQ-off latency of the machine. Then
+ *    again, being late doesn't loose the delta, just wrecks the sample.
+ *
+ *  - cpu_rq()->nr_uninterruptible isn't accurately tracked per-cpu because
+ *    this would add another cross-cpu cacheline miss and atomic operation
+ *    to the wakeup path. Instead we increment on whatever cpu the task ran
+ *    when it went into uninterruptible state and decrement on whatever cpu
+ *    did the wakeup. This means that only the sum of nr_uninterruptible over
+ *    all cpus yields the correct result.
+ *
+ *  This covers the NO_HZ=n code, for extra head-aches, see the comment below.
+ */
+
+/* Variables and functions for calc_load */
+atomic_long_t calc_load_tasks;
+unsigned long calc_load_update;
+unsigned long avenrun[3];
+EXPORT_SYMBOL(avenrun); /* should be removed */
+
+/**
+ * get_avenrun - get the load average array
+ * @loads:	pointer to dest load array
+ * @offset:	offset to add
+ * @shift:	shift count to shift the result left
+ *
+ * These values are estimates at best, so no need for locking.
+ */
+void get_avenrun(unsigned long *loads, unsigned long offset, int shift)
+{
+	loads[0] = (avenrun[0] + offset) << shift;
+	loads[1] = (avenrun[1] + offset) << shift;
+	loads[2] = (avenrun[2] + offset) << shift;
+}
+
+long calc_load_fold_active(struct rq *this_rq)
+{
+	long nr_active, delta = 0;
+
+	nr_active = this_rq->nr_running;
+	nr_active += (long) this_rq->nr_uninterruptible;
+
+	if (nr_active != this_rq->calc_load_active) {
+		delta = nr_active - this_rq->calc_load_active;
+		this_rq->calc_load_active = nr_active;
+	}
+
+	return delta;
+}
+
+/*
+ * a1 = a0 * e + a * (1 - e)
+ */
+static unsigned long
+calc_load(unsigned long load, unsigned long exp, unsigned long active)
+{
+	load *= exp;
+	load += active * (FIXED_1 - exp);
+	load += 1UL << (FSHIFT - 1);
+	return load >> FSHIFT;
+}
+
+#ifdef CONFIG_NO_HZ_COMMON
+/*
+ * Handle NO_HZ for the global load-average.
+ *
+ * Since the above described distributed algorithm to compute the global
+ * load-average relies on per-cpu sampling from the tick, it is affected by
+ * NO_HZ.
+ *
+ * The basic idea is to fold the nr_active delta into a global idle-delta upon
+ * entering NO_HZ state such that we can include this as an 'extra' cpu delta
+ * when we read the global state.
+ *
+ * Obviously reality has to ruin such a delightfully simple scheme:
+ *
+ *  - When we go NO_HZ idle during the window, we can negate our sample
+ *    contribution, causing under-accounting.
+ *
+ *    We avoid this by keeping two idle-delta counters and flipping them
+ *    when the window starts, thus separating old and new NO_HZ load.
+ *
+ *    The only trick is the slight shift in index flip for read vs write.
+ *
+ *        0s            5s            10s           15s
+ *          +10           +10           +10           +10
+ *        |-|-----------|-|-----------|-|-----------|-|
+ *    r:0 0 1           1 0           0 1           1 0
+ *    w:0 1 1           0 0           1 1           0 0
+ *
+ *    This ensures we'll fold the old idle contribution in this window while
+ *    accumlating the new one.
+ *
+ *  - When we wake up from NO_HZ idle during the window, we push up our
+ *    contribution, since we effectively move our sample point to a known
+ *    busy state.
+ *
+ *    This is solved by pushing the window forward, and thus skipping the
+ *    sample, for this cpu (effectively using the idle-delta for this cpu which
+ *    was in effect at the time the window opened). This also solves the issue
+ *    of having to deal with a cpu having been in NOHZ idle for multiple
+ *    LOAD_FREQ intervals.
+ *
+ * When making the ILB scale, we should try to pull this in as well.
+ */
+static atomic_long_t calc_load_idle[2];
+static int calc_load_idx;
+
+static inline int calc_load_write_idx(void)
+{
+	int idx = calc_load_idx;
+
+	/*
+	 * See calc_global_nohz(), if we observe the new index, we also
+	 * need to observe the new update time.
+	 */
+	smp_rmb();
+
+	/*
+	 * If the folding window started, make sure we start writing in the
+	 * next idle-delta.
+	 */
+	if (!time_before(jiffies, calc_load_update))
+		idx++;
+
+	return idx & 1;
+}
+
+static inline int calc_load_read_idx(void)
+{
+	return calc_load_idx & 1;
+}
+
+void calc_load_enter_idle(void)
+{
+	struct rq *this_rq = this_rq();
+	long delta;
+
+	/*
+	 * We're going into NOHZ mode, if there's any pending delta, fold it
+	 * into the pending idle delta.
+	 */
+	delta = calc_load_fold_active(this_rq);
+	if (delta) {
+		int idx = calc_load_write_idx();
+		atomic_long_add(delta, &calc_load_idle[idx]);
+	}
+}
+
+void calc_load_exit_idle(void)
+{
+	struct rq *this_rq = this_rq();
+
+	/*
+	 * If we're still before the sample window, we're done.
+	 */
+	if (time_before(jiffies, this_rq->calc_load_update))
+		return;
+
+	/*
+	 * We woke inside or after the sample window, this means we're already
+	 * accounted through the nohz accounting, so skip the entire deal and
+	 * sync up for the next window.
+	 */
+	this_rq->calc_load_update = calc_load_update;
+	if (time_before(jiffies, this_rq->calc_load_update + 10))
+		this_rq->calc_load_update += LOAD_FREQ;
+}
+
+static long calc_load_fold_idle(void)
+{
+	int idx = calc_load_read_idx();
+	long delta = 0;
+
+	if (atomic_long_read(&calc_load_idle[idx]))
+		delta = atomic_long_xchg(&calc_load_idle[idx], 0);
+
+	return delta;
+}
+
+/**
+ * fixed_power_int - compute: x^n, in O(log n) time
+ *
+ * @x:         base of the power
+ * @frac_bits: fractional bits of @x
+ * @n:         power to raise @x to.
+ *
+ * By exploiting the relation between the definition of the natural power
+ * function: x^n := x*x*...*x (x multiplied by itself for n times), and
+ * the binary encoding of numbers used by computers: n := \Sum n_i * 2^i,
+ * (where: n_i \elem {0, 1}, the binary vector representing n),
+ * we find: x^n := x^(\Sum n_i * 2^i) := \Prod x^(n_i * 2^i), which is
+ * of course trivially computable in O(log_2 n), the length of our binary
+ * vector.
+ */
+static unsigned long
+fixed_power_int(unsigned long x, unsigned int frac_bits, unsigned int n)
+{
+	unsigned long result = 1UL << frac_bits;
+
+	if (n) for (;;) {
+		if (n & 1) {
+			result *= x;
+			result += 1UL << (frac_bits - 1);
+			result >>= frac_bits;
+		}
+		n >>= 1;
+		if (!n)
+			break;
+		x *= x;
+		x += 1UL << (frac_bits - 1);
+		x >>= frac_bits;
+	}
+
+	return result;
+}
+
+/*
+ * a1 = a0 * e + a * (1 - e)
+ *
+ * a2 = a1 * e + a * (1 - e)
+ *    = (a0 * e + a * (1 - e)) * e + a * (1 - e)
+ *    = a0 * e^2 + a * (1 - e) * (1 + e)
+ *
+ * a3 = a2 * e + a * (1 - e)
+ *    = (a0 * e^2 + a * (1 - e) * (1 + e)) * e + a * (1 - e)
+ *    = a0 * e^3 + a * (1 - e) * (1 + e + e^2)
+ *
+ *  ...
+ *
+ * an = a0 * e^n + a * (1 - e) * (1 + e + ... + e^n-1) [1]
+ *    = a0 * e^n + a * (1 - e) * (1 - e^n)/(1 - e)
+ *    = a0 * e^n + a * (1 - e^n)
+ *
+ * [1] application of the geometric series:
+ *
+ *              n         1 - x^(n+1)
+ *     S_n := \Sum x^i = -------------
+ *             i=0          1 - x
+ */
+static unsigned long
+calc_load_n(unsigned long load, unsigned long exp,
+	    unsigned long active, unsigned int n)
+{
+
+	return calc_load(load, fixed_power_int(exp, FSHIFT, n), active);
+}
+
+/*
+ * NO_HZ can leave us missing all per-cpu ticks calling
+ * calc_load_account_active(), but since an idle CPU folds its delta into
+ * calc_load_tasks_idle per calc_load_account_idle(), all we need to do is fold
+ * in the pending idle delta if our idle period crossed a load cycle boundary.
+ *
+ * Once we've updated the global active value, we need to apply the exponential
+ * weights adjusted to the number of cycles missed.
+ */
+static void calc_global_nohz(void)
+{
+	long delta, active, n;
+
+	if (!time_before(jiffies, calc_load_update + 10)) {
+		/*
+		 * Catch-up, fold however many we are behind still
+		 */
+		delta = jiffies - calc_load_update - 10;
+		n = 1 + (delta / LOAD_FREQ);
+
+		active = atomic_long_read(&calc_load_tasks);
+		active = active > 0 ? active * FIXED_1 : 0;
+
+		avenrun[0] = calc_load_n(avenrun[0], EXP_1, active, n);
+		avenrun[1] = calc_load_n(avenrun[1], EXP_5, active, n);
+		avenrun[2] = calc_load_n(avenrun[2], EXP_15, active, n);
+
+		calc_load_update += n * LOAD_FREQ;
+	}
+
+	/*
+	 * Flip the idle index...
+	 *
+	 * Make sure we first write the new time then flip the index, so that
+	 * calc_load_write_idx() will see the new time when it reads the new
+	 * index, this avoids a double flip messing things up.
+	 */
+	smp_wmb();
+	calc_load_idx++;
+}
+#else /* !CONFIG_NO_HZ_COMMON */
+
+static inline long calc_load_fold_idle(void) { return 0; }
+static inline void calc_global_nohz(void) { }
+
+#endif /* CONFIG_NO_HZ_COMMON */
+
+/*
+ * calc_load - update the avenrun load estimates 10 ticks after the
+ * CPUs have updated calc_load_tasks.
+ */
+void calc_global_load(unsigned long ticks)
+{
+	long active, delta;
+
+	if (time_before(jiffies, calc_load_update + 10))
+		return;
+
+	/*
+	 * Fold the 'old' idle-delta to include all NO_HZ cpus.
+	 */
+	delta = calc_load_fold_idle();
+	if (delta)
+		atomic_long_add(delta, &calc_load_tasks);
+
+	active = atomic_long_read(&calc_load_tasks);
+	active = active > 0 ? active * FIXED_1 : 0;
+
+	avenrun[0] = calc_load(avenrun[0], EXP_1, active);
+	avenrun[1] = calc_load(avenrun[1], EXP_5, active);
+	avenrun[2] = calc_load(avenrun[2], EXP_15, active);
+
+	calc_load_update += LOAD_FREQ;
+
+	/*
+	 * In case we idled for multiple LOAD_FREQ intervals, catch up in bulk.
+	 */
+	calc_global_nohz();
+}
+
+/*
+ * Called from update_cpu_load() to periodically update this CPU's
+ * active count.
+ */
+static void calc_load_account_active(struct rq *this_rq)
+{
+	long delta;
+
+	if (time_before(jiffies, this_rq->calc_load_update))
+		return;
+
+	delta  = calc_load_fold_active(this_rq);
+	if (delta)
+		atomic_long_add(delta, &calc_load_tasks);
+
+	this_rq->calc_load_update += LOAD_FREQ;
+}
+
+/*
+ * End of global load-average stuff
+ */
+
+/*
+ * The exact cpuload at various idx values, calculated at every tick would be
+ * load = (2^idx - 1) / 2^idx * load + 1 / 2^idx * cur_load
+ *
+ * If a cpu misses updates for n-1 ticks (as it was idle) and update gets called
+ * on nth tick when cpu may be busy, then we have:
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * load = (2^idx - 1) / 2^idx) * load + 1 / 2^idx * cur_load
+ *
+ * decay_load_missed() below does efficient calculation of
+ * load = ((2^idx - 1) / 2^idx)^(n-1) * load
+ * avoiding 0..n-1 loop doing load = ((2^idx - 1) / 2^idx) * load
+ *
+ * The calculation is approximated on a 128 point scale.
+ * degrade_zero_ticks is the number of ticks after which load at any
+ * particular idx is approximated to be zero.
+ * degrade_factor is a precomputed table, a row for each load idx.
+ * Each column corresponds to degradation factor for a power of two ticks,
+ * based on 128 point scale.
+ * Example:
+ * row 2, col 3 (=12) says that the degradation at load idx 2 after
+ * 8 ticks is 12/128 (which is an approximation of exact factor 3^8/4^8).
+ *
+ * With this power of 2 load factors, we can degrade the load n times
+ * by looking at 1 bits in n and doing as many mult/shift instead of
+ * n mult/shifts needed by the exact degradation.
+ */
+#define DEGRADE_SHIFT		7
+static const unsigned char
+		degrade_zero_ticks[CPU_LOAD_IDX_MAX] = {0, 8, 32, 64, 128};
+static const unsigned char
+		degrade_factor[CPU_LOAD_IDX_MAX][DEGRADE_SHIFT + 1] = {
+					{0, 0, 0, 0, 0, 0, 0, 0},
+					{64, 32, 8, 0, 0, 0, 0, 0},
+					{96, 72, 40, 12, 1, 0, 0},
+					{112, 98, 75, 43, 15, 1, 0},
+					{120, 112, 98, 76, 45, 16, 2} };
+
+/*
+ * Update cpu_load for any missed ticks, due to tickless idle. The backlog
+ * would be when CPU is idle and so we just decay the old load without
+ * adding any new load.
+ */
+static unsigned long
+decay_load_missed(unsigned long load, unsigned long missed_updates, int idx)
+{
+	int j = 0;
+
+	if (!missed_updates)
+		return load;
+
+	if (missed_updates >= degrade_zero_ticks[idx])
+		return 0;
+
+	if (idx == 1)
+		return load >> missed_updates;
+
+	while (missed_updates) {
+		if (missed_updates % 2)
+			load = (load * degrade_factor[idx][j]) >> DEGRADE_SHIFT;
+
+		missed_updates >>= 1;
+		j++;
+	}
+	return load;
+}
+
+/*
+ * Update rq->cpu_load[] statistics. This function is usually called every
+ * scheduler tick (TICK_NSEC). With tickless idle this will not be called
+ * every tick. We fix it up based on jiffies.
+ */
+static void __update_cpu_load(struct rq *this_rq, unsigned long this_load,
+			      unsigned long pending_updates)
+{
+	int i, scale;
+
+	this_rq->nr_load_updates++;
+
+	/* Update our load: */
+	this_rq->cpu_load[0] = this_load; /* Fasttrack for idx 0 */
+	for (i = 1, scale = 2; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
+		unsigned long old_load, new_load;
+
+		/* scale is effectively 1 << i now, and >> i divides by scale */
+
+		old_load = this_rq->cpu_load[i];
+		old_load = decay_load_missed(old_load, pending_updates - 1, i);
+		new_load = this_load;
+		/*
+		 * Round up the averaging division if load is increasing. This
+		 * prevents us from getting stuck on 9 if the load is 10, for
+		 * example.
+		 */
+		if (new_load > old_load)
+			new_load += scale - 1;
+
+		this_rq->cpu_load[i] = (old_load * (scale - 1) + new_load) >> i;
+	}
+
+	sched_avg_update(this_rq);
+}
+
+#ifdef CONFIG_SMP
+static inline unsigned long get_rq_runnable_load(struct rq *rq)
+{
+	return rq->cfs.runnable_load_avg;
+}
+#else
+static inline unsigned long get_rq_runnable_load(struct rq *rq)
+{
+	return rq->load.weight;
+}
+#endif
+
+#ifdef CONFIG_NO_HZ_COMMON
+/*
+ * There is no sane way to deal with nohz on smp when using jiffies because the
+ * cpu doing the jiffies update might drift wrt the cpu doing the jiffy reading
+ * causing off-by-one errors in observed deltas; {0,2} instead of {1,1}.
+ *
+ * Therefore we cannot use the delta approach from the regular tick since that
+ * would seriously skew the load calculation. However we'll make do for those
+ * updates happening while idle (nohz_idle_balance) or coming out of idle
+ * (tick_nohz_idle_exit).
+ *
+ * This means we might still be one tick off for nohz periods.
+ */
+
+/*
+ * Called from nohz_idle_balance() to update the load ratings before doing the
+ * idle balance.
+ */
+void update_idle_cpu_load(struct rq *this_rq)
+{
+	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
+	unsigned long load = get_rq_runnable_load(this_rq);
+	unsigned long pending_updates;
+
+	/*
+	 * bail if there's load or we're actually up-to-date.
+	 */
+	if (load || curr_jiffies == this_rq->last_load_update_tick)
+		return;
+
+	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
+	this_rq->last_load_update_tick = curr_jiffies;
+
+	__update_cpu_load(this_rq, load, pending_updates);
+}
+
+/*
+ * Called from tick_nohz_idle_exit() -- try and fix up the ticks we missed.
+ */
+void update_cpu_load_nohz(void)
+{
+	struct rq *this_rq = this_rq();
+	unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
+	unsigned long pending_updates;
+
+	if (curr_jiffies == this_rq->last_load_update_tick)
+		return;
+
+	raw_spin_lock(&this_rq->lock);
+	pending_updates = curr_jiffies - this_rq->last_load_update_tick;
+	if (pending_updates) {
+		this_rq->last_load_update_tick = curr_jiffies;
+		/*
+		 * We were idle, this means load 0, the current load might be
+		 * !0 due to remote wakeups and the sort.
+		 */
+		__update_cpu_load(this_rq, 0, pending_updates);
+	}
+	raw_spin_unlock(&this_rq->lock);
+}
+#endif /* CONFIG_NO_HZ */
+
+/*
+ * Called from scheduler_tick()
+ */
+void update_cpu_load_active(struct rq *this_rq)
+{
+	unsigned long load = get_rq_runnable_load(this_rq);
+	/*
+	 * See the mess around update_idle_cpu_load() / update_cpu_load_nohz().
+	 */
+	this_rq->last_load_update_tick = jiffies;
+	__update_cpu_load(this_rq, load, 1);
+
+	calc_load_account_active(this_rq);
+}
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 127a2c4cf4ab..01970c8e64df 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -399,20 +399,6 @@ static inline struct task_group *next_task_group(struct task_group *tg)
 		(iter = next_task_group(iter)) &&			\
 		(rt_rq = iter->rt_rq[cpu_of(rq)]);)
 
-static inline void list_add_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-	list_add_rcu(&rt_rq->leaf_rt_rq_list,
-			&rq_of_rt_rq(rt_rq)->leaf_rt_rq_list);
-}
-
-static inline void list_del_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-	list_del_rcu(&rt_rq->leaf_rt_rq_list);
-}
-
-#define for_each_leaf_rt_rq(rt_rq, rq) \
-	list_for_each_entry_rcu(rt_rq, &rq->leaf_rt_rq_list, leaf_rt_rq_list)
-
 #define for_each_sched_rt_entity(rt_se) \
 	for (; rt_se; rt_se = rt_se->parent)
 
@@ -472,7 +458,7 @@ static int rt_se_boosted(struct sched_rt_entity *rt_se)
 #ifdef CONFIG_SMP
 static inline const struct cpumask *sched_rt_period_mask(void)
 {
-	return cpu_rq(smp_processor_id())->rd->span;
+	return this_rq()->rd->span;
 }
 #else
 static inline const struct cpumask *sched_rt_period_mask(void)
@@ -509,17 +495,6 @@ typedef struct rt_rq *rt_rq_iter_t;
 #define for_each_rt_rq(rt_rq, iter, rq) \
 	for ((void) iter, rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
 
-static inline void list_add_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-}
-
-static inline void list_del_leaf_rt_rq(struct rt_rq *rt_rq)
-{
-}
-
-#define for_each_leaf_rt_rq(rt_rq, rq) \
-	for (rt_rq = &rq->rt; rt_rq; rt_rq = NULL)
-
 #define for_each_sched_rt_entity(rt_se) \
 	for (; rt_se; rt_se = NULL)
 
@@ -699,15 +674,6 @@ balanced:
 	}
 }
 
-static void disable_runtime(struct rq *rq)
-{
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&rq->lock, flags);
-	__disable_runtime(rq);
-	raw_spin_unlock_irqrestore(&rq->lock, flags);
-}
-
 static void __enable_runtime(struct rq *rq)
 {
 	rt_rq_iter_t iter;
@@ -732,37 +698,6 @@ static void __enable_runtime(struct rq *rq)
 	}
 }
 
-static void enable_runtime(struct rq *rq)
-{
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&rq->lock, flags);
-	__enable_runtime(rq);
-	raw_spin_unlock_irqrestore(&rq->lock, flags);
-}
-
-int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
-	int cpu = (int)(long)hcpu;
-
-	switch (action) {
-	case CPU_DOWN_PREPARE:
-	case CPU_DOWN_PREPARE_FROZEN:
-		disable_runtime(cpu_rq(cpu));
-		return NOTIFY_OK;
-
-	case CPU_DOWN_FAILED:
-	case CPU_DOWN_FAILED_FROZEN:
-	case CPU_ONLINE:
-	case CPU_ONLINE_FROZEN:
-		enable_runtime(cpu_rq(cpu));
-		return NOTIFY_OK;
-
-	default:
-		return NOTIFY_DONE;
-	}
-}
-
 static int balance_runtime(struct rt_rq *rt_rq)
 {
 	int more = 0;
@@ -926,7 +861,7 @@ static void update_curr_rt(struct rq *rq)
 	if (curr->sched_class != &rt_sched_class)
 		return;
 
-	delta_exec = rq->clock_task - curr->se.exec_start;
+	delta_exec = rq_clock_task(rq) - curr->se.exec_start;
 	if (unlikely((s64)delta_exec <= 0))
 		return;
 
@@ -936,7 +871,7 @@ static void update_curr_rt(struct rq *rq)
 	curr->se.sum_exec_runtime += delta_exec;
 	account_group_exec_runtime(curr, delta_exec);
 
-	curr->se.exec_start = rq->clock_task;
+	curr->se.exec_start = rq_clock_task(rq);
 	cpuacct_charge(curr, delta_exec);
 
 	sched_rt_avg_update(rq, delta_exec);
@@ -1106,9 +1041,6 @@ static void __enqueue_rt_entity(struct sched_rt_entity *rt_se, bool head)
 	if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
 		return;
 
-	if (!rt_rq->rt_nr_running)
-		list_add_leaf_rt_rq(rt_rq);
-
 	if (head)
 		list_add(&rt_se->run_list, queue);
 	else
@@ -1128,8 +1060,6 @@ static void __dequeue_rt_entity(struct sched_rt_entity *rt_se)
 		__clear_bit(rt_se_prio(rt_se), array->bitmap);
 
 	dec_rt_tasks(rt_se, rt_rq);
-	if (!rt_rq->rt_nr_running)
-		list_del_leaf_rt_rq(rt_rq);
 }
 
 /*
@@ -1385,7 +1315,7 @@ static struct task_struct *_pick_next_task_rt(struct rq *rq)
 	} while (rt_rq);
 
 	p = rt_task_of(rt_se);
-	p->se.exec_start = rq->clock_task;
+	p->se.exec_start = rq_clock_task(rq);
 
 	return p;
 }
@@ -1434,42 +1364,24 @@ static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
 	return 0;
 }
 
-/* Return the second highest RT task, NULL otherwise */
-static struct task_struct *pick_next_highest_task_rt(struct rq *rq, int cpu)
+/*
+ * Return the highest pushable rq's task, which is suitable to be executed
+ * on the cpu, NULL otherwise
+ */
+static struct task_struct *pick_highest_pushable_task(struct rq *rq, int cpu)
 {
-	struct task_struct *next = NULL;
-	struct sched_rt_entity *rt_se;
-	struct rt_prio_array *array;
-	struct rt_rq *rt_rq;
-	int idx;
-
-	for_each_leaf_rt_rq(rt_rq, rq) {
-		array = &rt_rq->active;
-		idx = sched_find_first_bit(array->bitmap);
-next_idx:
-		if (idx >= MAX_RT_PRIO)
-			continue;
-		if (next && next->prio <= idx)
-			continue;
-		list_for_each_entry(rt_se, array->queue + idx, run_list) {
-			struct task_struct *p;
+	struct plist_head *head = &rq->rt.pushable_tasks;
+	struct task_struct *p;
 
-			if (!rt_entity_is_task(rt_se))
-				continue;
+	if (!has_pushable_tasks(rq))
+		return NULL;
 
-			p = rt_task_of(rt_se);
-			if (pick_rt_task(rq, p, cpu)) {
-				next = p;
-				break;
-			}
-		}
-		if (!next) {
-			idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx+1);
-			goto next_idx;
-		}
+	plist_for_each_entry(p, head, pushable_tasks) {
+		if (pick_rt_task(rq, p, cpu))
+			return p;
 	}
 
-	return next;
+	return NULL;
 }
 
 static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
@@ -1743,12 +1655,10 @@ static int pull_rt_task(struct rq *this_rq)
 		double_lock_balance(this_rq, src_rq);
 
 		/*
-		 * Are there still pullable RT tasks?
+		 * We can pull only a task, which is pushable
+		 * on its rq, and no others.
 		 */
-		if (src_rq->rt.rt_nr_running <= 1)
-			goto skip;
-
-		p = pick_next_highest_task_rt(src_rq, this_cpu);
+		p = pick_highest_pushable_task(src_rq, this_cpu);
 
 		/*
 		 * Do we have an RT task that preempts
@@ -2037,7 +1947,7 @@ static void set_curr_task_rt(struct rq *rq)
 {
 	struct task_struct *p = rq->curr;
 
-	p->se.exec_start = rq->clock_task;
+	p->se.exec_start = rq_clock_task(rq);
 
 	/* The running task is never eligible for pushing */
 	dequeue_pushable_task(rq, p);
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index ce39224d6155..ef0a7b2439dd 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -10,8 +10,16 @@
 #include "cpupri.h"
 #include "cpuacct.h"
 
+struct rq;
+
 extern __read_mostly int scheduler_running;
 
+extern unsigned long calc_load_update;
+extern atomic_long_t calc_load_tasks;
+
+extern long calc_load_fold_active(struct rq *this_rq);
+extern void update_cpu_load_active(struct rq *this_rq);
+
 /*
  * Convert user-nice values [ -20 ... 0 ... 19 ]
  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],
@@ -140,10 +148,11 @@ struct task_group {
 	struct cfs_rq **cfs_rq;
 	unsigned long shares;
 
-	atomic_t load_weight;
-	atomic64_t load_avg;
+#ifdef	CONFIG_SMP
+	atomic_long_t load_avg;
 	atomic_t runnable_avg;
 #endif
+#endif
 
 #ifdef CONFIG_RT_GROUP_SCHED
 	struct sched_rt_entity **rt_se;
@@ -261,26 +270,21 @@ struct cfs_rq {
 #endif
 
 #ifdef CONFIG_SMP
-/*
- * Load-tracking only depends on SMP, FAIR_GROUP_SCHED dependency below may be
- * removed when useful for applications beyond shares distribution (e.g.
- * load-balance).
- */
-#ifdef CONFIG_FAIR_GROUP_SCHED
 	/*
 	 * CFS Load tracking
 	 * Under CFS, load is tracked on a per-entity basis and aggregated up.
 	 * This allows for the description of both thread and group usage (in
 	 * the FAIR_GROUP_SCHED case).
 	 */
-	u64 runnable_load_avg, blocked_load_avg;
-	atomic64_t decay_counter, removed_load;
+	unsigned long runnable_load_avg, blocked_load_avg;
+	atomic64_t decay_counter;
 	u64 last_decay;
-#endif /* CONFIG_FAIR_GROUP_SCHED */
-/* These always depend on CONFIG_FAIR_GROUP_SCHED */
+	atomic_long_t removed_load;
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
+	/* Required to track per-cpu representation of a task_group */
 	u32 tg_runnable_contrib;
-	u64 tg_load_contrib;
+	unsigned long tg_load_contrib;
 #endif /* CONFIG_FAIR_GROUP_SCHED */
 
 	/*
@@ -353,7 +357,6 @@ struct rt_rq {
 	unsigned long rt_nr_boosted;
 
 	struct rq *rq;
-	struct list_head leaf_rt_rq_list;
 	struct task_group *tg;
 #endif
 };
@@ -540,6 +543,16 @@ DECLARE_PER_CPU(struct rq, runqueues);
 #define cpu_curr(cpu)		(cpu_rq(cpu)->curr)
 #define raw_rq()		(&__raw_get_cpu_var(runqueues))
 
+static inline u64 rq_clock(struct rq *rq)
+{
+	return rq->clock;
+}
+
+static inline u64 rq_clock_task(struct rq *rq)
+{
+	return rq->clock_task;
+}
+
 #ifdef CONFIG_SMP
 
 #define rcu_dereference_check_sched_domain(p) \
@@ -884,24 +897,6 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 #define WF_FORK		0x02		/* child wakeup after fork */
 #define WF_MIGRATED	0x4		/* internal use, task got migrated */
 
-static inline void update_load_add(struct load_weight *lw, unsigned long inc)
-{
-	lw->weight += inc;
-	lw->inv_weight = 0;
-}
-
-static inline void update_load_sub(struct load_weight *lw, unsigned long dec)
-{
-	lw->weight -= dec;
-	lw->inv_weight = 0;
-}
-
-static inline void update_load_set(struct load_weight *lw, unsigned long w)
-{
-	lw->weight = w;
-	lw->inv_weight = 0;
-}
-
 /*
  * To aid in avoiding the subversion of "niceness" due to uneven distribution
  * of tasks with abnormal "nice" values across CPUs the contribution that
@@ -1028,17 +1023,8 @@ extern void update_group_power(struct sched_domain *sd, int cpu);
 extern void trigger_load_balance(struct rq *rq, int cpu);
 extern void idle_balance(int this_cpu, struct rq *this_rq);
 
-/*
- * Only depends on SMP, FAIR_GROUP_SCHED may be removed when runnable_avg
- * becomes useful in lb
- */
-#if defined(CONFIG_FAIR_GROUP_SCHED)
 extern void idle_enter_fair(struct rq *this_rq);
 extern void idle_exit_fair(struct rq *this_rq);
-#else
-static inline void idle_enter_fair(struct rq *this_rq) {}
-static inline void idle_exit_fair(struct rq *this_rq) {}
-#endif
 
 #else	/* CONFIG_SMP */
 
@@ -1051,7 +1037,6 @@ static inline void idle_balance(int cpu, struct rq *rq)
 extern void sysrq_sched_debug_show(void);
 extern void sched_init_granularity(void);
 extern void update_max_interval(void);
-extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu);
 extern void init_sched_rt_class(void);
 extern void init_sched_fair_class(void);
 
@@ -1063,6 +1048,8 @@ extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime
 
 extern void update_idle_cpu_load(struct rq *this_rq);
 
+extern void init_task_runnable_average(struct task_struct *p);
+
 #ifdef CONFIG_PARAVIRT
 static inline u64 steal_ticks(u64 steal)
 {
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 2ef90a51ec5e..17d7065c3872 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -61,7 +61,7 @@ static inline void sched_info_reset_dequeued(struct task_struct *t)
  */
 static inline void sched_info_dequeued(struct task_struct *t)
 {
-	unsigned long long now = task_rq(t)->clock, delta = 0;
+	unsigned long long now = rq_clock(task_rq(t)), delta = 0;
 
 	if (unlikely(sched_info_on()))
 		if (t->sched_info.last_queued)
@@ -79,7 +79,7 @@ static inline void sched_info_dequeued(struct task_struct *t)
  */
 static void sched_info_arrive(struct task_struct *t)
 {
-	unsigned long long now = task_rq(t)->clock, delta = 0;
+	unsigned long long now = rq_clock(task_rq(t)), delta = 0;
 
 	if (t->sched_info.last_queued)
 		delta = now - t->sched_info.last_queued;
@@ -100,7 +100,7 @@ static inline void sched_info_queued(struct task_struct *t)
 {
 	if (unlikely(sched_info_on()))
 		if (!t->sched_info.last_queued)
-			t->sched_info.last_queued = task_rq(t)->clock;
+			t->sched_info.last_queued = rq_clock(task_rq(t));
 }
 
 /*
@@ -112,7 +112,7 @@ static inline void sched_info_queued(struct task_struct *t)
  */
 static inline void sched_info_depart(struct task_struct *t)
 {
-	unsigned long long delta = task_rq(t)->clock -
+	unsigned long long delta = rq_clock(task_rq(t)) -
 					t->sched_info.last_arrival;
 
 	rq_sched_info_depart(task_rq(t), delta);
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index da5eb5bed84a..e08fbeeb54b9 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -28,7 +28,7 @@ static struct task_struct *pick_next_task_stop(struct rq *rq)
 	struct task_struct *stop = rq->stop;
 
 	if (stop && stop->on_rq) {
-		stop->se.exec_start = rq->clock_task;
+		stop->se.exec_start = rq_clock_task(rq);
 		return stop;
 	}
 
@@ -57,7 +57,7 @@ static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
 	struct task_struct *curr = rq->curr;
 	u64 delta_exec;
 
-	delta_exec = rq->clock_task - curr->se.exec_start;
+	delta_exec = rq_clock_task(rq) - curr->se.exec_start;
 	if (unlikely((s64)delta_exec < 0))
 		delta_exec = 0;
 
@@ -67,7 +67,7 @@ static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
 	curr->se.sum_exec_runtime += delta_exec;
 	account_group_exec_runtime(curr, delta_exec);
 
-	curr->se.exec_start = rq->clock_task;
+	curr->se.exec_start = rq_clock_task(rq);
 	cpuacct_charge(curr, delta_exec);
 }
 
@@ -79,7 +79,7 @@ static void set_curr_task_stop(struct rq *rq)
 {
 	struct task_struct *stop = rq->stop;
 
-	stop->se.exec_start = rq->clock_task;
+	stop->se.exec_start = rq_clock_task(rq);
 }
 
 static void switched_to_stop(struct rq *rq, struct task_struct *p)
diff --git a/kernel/time.c b/kernel/time.c
index d3617dbd3dca..7c7964c33ae7 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -11,7 +11,7 @@
  * Modification history kernel/time.c
  *
  * 1993-09-02    Philip Gladstone
- *      Created file with time related functions from sched.c and adjtimex()
+ *      Created file with time related functions from sched/core.c and adjtimex()
  * 1993-10-08    Torsten Duwe
  *      adjtime interface update and CMOS clock write code
  * 1995-08-13    Torsten Duwe
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index ad83c96b2ece..7e2204db0b1a 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -64,7 +64,7 @@ static inline struct worker *current_wq_worker(void)
 
 /*
  * Scheduler hooks for concurrency managed workqueue.  Only to be used from
- * sched.c and workqueue.c.
+ * sched/core.c and workqueue.c.
  */
 void wq_worker_waking_up(struct task_struct *task, int cpu);
 struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);