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Date:	Mon, 16 May 2016 02:59:29 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Cc:	bsegall@...gle.com, pjt@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	juri.lelli@....com, Yuyang Du <yuyang.du@...el.com>
Subject: [RFC PATCH 4/9] sched/fair: Rename variable names for sched averages

The names of sched averages (including load_avg and util_avg) have
been changed and added in the past a couple of years, some of the
names are a bit confusing especially to people who first read them.
This patch attempts to make the names more self-explaining. And some
comments are updated too.

The renames are listed as follows:

 - update_load_avg() to update_sched_avg()

 - enqueue_entity_load_avg() to enqueue_entity_sched_avg()

 - dequeue_entity_load_avg() to dequeue_entity_sched_avg()

 - detach_entity_load_avg() to detach_entity_sched_avg()

 - attach_entity_load_avg() to attach_entity_sched_avg()

 - remove_entity_load_avg() to remove_entity_sched_avg()

 - LOAD_AVG_PERIOD to SCHED_AVG_HALFLIFE

 - LOAD_AVG_MAX_N to SCHED_AVG_MAX_N

 - LOAD_AVG_MAX to SCHED_AVG_MAX

 - runnable_avg_yN_sum[] to __accumulated_sum_N[]

 - runnable_avg_yN_inv[] to __decay_inv_multiply_N[]

 - __compute_runnable_contrib() to __accumulate_sum()

 - decay_load() to __decay_sum()

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 include/linux/sched.h |    2 +-
 kernel/sched/fair.c   |  219 +++++++++++++++++++++++++------------------------
 kernel/sched/sched.h  |    2 +-
 3 files changed, 114 insertions(+), 109 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1b43b45..9710e2b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1221,7 +1221,7 @@ struct load_weight {
 
 /*
  * The load_avg/util_avg accumulates an infinite geometric series
- * (see __update_load_avg() in kernel/sched/fair.c).
+ * (see __update_sched_avg() in kernel/sched/fair.c).
  *
  * [load_avg definition]
  *
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 66fba3f..fddaa61 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -660,13 +660,15 @@ static int select_idle_sibling(struct task_struct *p, int cpu);
 static unsigned long task_h_load(struct task_struct *p);
 
 /*
- * We choose a half-life close to 1 scheduling period.
- * Note: The tables runnable_avg_yN_inv and runnable_avg_yN_sum are
- * dependent on this value.
+ * Note: everything in sched average calculation, including
+ * __decay_inv_multiply_N, __accumulated_sum_N, __accumulated_sum_N32,
+ * SCHED_AVG_MAX, and SCHED_AVG_MAX_N, is dependent on and only on
+ * (1) exponential decay, (2) a period of 1024*1024ns (~1ms), and (3)
+ * a half-life of 32 periods.
  */
-#define LOAD_AVG_PERIOD 32
-#define LOAD_AVG_MAX 47742 /* maximum possible load avg */
-#define LOAD_AVG_MAX_N 347 /* number of full periods to produce LOAD_AVG_MAX */
+#define SCHED_AVG_HALFLIFE 32	/* number of periods as a half-life */
+#define SCHED_AVG_MAX 47742	/* maximum possible sched avg */
+#define SCHED_AVG_MAX_N 345	/* number of full periods to produce SCHED_AVG_MAX */
 
 /* Give new sched_entity start runnable values to heavy its load in infant time */
 void init_entity_runnable_average(struct sched_entity *se)
@@ -681,7 +683,7 @@ void init_entity_runnable_average(struct sched_entity *se)
 	 */
 	sa->period_contrib = 1023;
 	sa->load_avg = scale_load_down(se->load.weight);
-	sa->load_sum = sa->load_avg * LOAD_AVG_MAX;
+	sa->load_sum = sa->load_avg * SCHED_AVG_MAX;
 	/*
 	 * At this point, util_avg won't be used in select_task_rq_fair anyway
 	 */
@@ -731,7 +733,7 @@ void post_init_entity_util_avg(struct sched_entity *se)
 		} else {
 			sa->util_avg = cap;
 		}
-		sa->util_sum = sa->util_avg * LOAD_AVG_MAX;
+		sa->util_sum = sa->util_avg * SCHED_AVG_MAX;
 	}
 }
 
@@ -1834,7 +1836,7 @@ static u64 numa_get_avg_runtime(struct task_struct *p, u64 *period)
 		*period = now - p->last_task_numa_placement;
 	} else {
 		delta = p->se.avg.load_sum / p->se.load.weight;
-		*period = LOAD_AVG_MAX;
+		*period = SCHED_AVG_MAX;
 	}
 
 	p->last_sum_exec_runtime = runtime;
@@ -2583,7 +2585,7 @@ static inline void update_cfs_shares(struct cfs_rq *cfs_rq)
 
 #ifdef CONFIG_SMP
 /* Precomputed fixed inverse multiplies for multiplication by y^n */
-static const u32 runnable_avg_yN_inv[] = {
+static const u32 __decay_inv_multiply_N[] = {
 	0xffffffff, 0xfa83b2da, 0xf5257d14, 0xefe4b99a, 0xeac0c6e6, 0xe5b906e6,
 	0xe0ccdeeb, 0xdbfbb796, 0xd744fcc9, 0xd2a81d91, 0xce248c14, 0xc9b9bd85,
 	0xc5672a10, 0xc12c4cc9, 0xbd08a39e, 0xb8fbaf46, 0xb504f333, 0xb123f581,
@@ -2596,7 +2598,7 @@ static const u32 runnable_avg_yN_inv[] = {
  * Precomputed \Sum y^k { 1<=k<=n }.  These are floor(true_value) to prevent
  * over-estimates when re-combining.
  */
-static const u32 runnable_avg_yN_sum[] = {
+static const u32 __accumulated_sum_N[] = {
 	    0, 1002, 1982, 2941, 3880, 4798, 5697, 6576, 7437, 8279, 9103,
 	 9909,10698,11470,12226,12966,13690,14398,15091,15769,16433,17082,
 	17718,18340,18949,19545,20128,20698,21256,21802,22336,22859,23371,
@@ -2613,93 +2615,95 @@ static const u32 __accumulated_sum_N32[] = {
 };
 
 /*
- * Approximate:
- *   val * y^n,    where y^32 ~= 0.5 (~1 scheduling period)
+ * val * y^n, where y^m ~= 0.5
+ *
+ * n is the number of periods past; a period is ~1ms
+ * m is half-life in exponential decay; here it is SCHED_AVG_HALFLIFE=32.
  */
-static __always_inline u64 decay_load(u64 val, u64 n)
+static __always_inline u64 __decay_sum(u64 val, u64 n)
 {
 	unsigned int local_n;
 
 	if (!n)
 		return val;
-	else if (unlikely(n > LOAD_AVG_PERIOD * 63))
+	else if (unlikely(n > SCHED_AVG_HALFLIFE * 63))
 		return 0;
 
 	/* after bounds checking we can collapse to 32-bit */
 	local_n = n;
 
 	/*
-	 * As y^PERIOD = 1/2, we can combine
-	 *    y^n = 1/2^(n/PERIOD) * y^(n%PERIOD)
-	 * With a look-up table which covers y^n (n<PERIOD)
+	 * As y^HALFLIFE = 1/2, we can combine
+	 *    y^n = 1/2^(n/HALFLIFE) * y^(n%HALFLIFE)
+	 * With a look-up table which covers y^n (n<HALFLIFE)
 	 *
-	 * To achieve constant time decay_load.
+	 * To achieve constant time __decay_load.
 	 */
-	if (unlikely(local_n >= LOAD_AVG_PERIOD)) {
-		val >>= local_n / LOAD_AVG_PERIOD;
-		local_n %= LOAD_AVG_PERIOD;
+	if (unlikely(local_n >= SCHED_AVG_HALFLIFE)) {
+		val >>= local_n / SCHED_AVG_HALFLIFE;
+		local_n %= SCHED_AVG_HALFLIFE;
 	}
 
-	val = mul_u64_u32_shr(val, runnable_avg_yN_inv[local_n], 32);
+	val = mul_u64_u32_shr(val, __decay_inv_multiply_N[local_n], 32);
 	return val;
 }
 
 /*
- * For updates fully spanning n periods, the contribution to runnable
- * average will be: \Sum 1024*y^n
+ * For updates fully spanning n periods, the accumulated contribution
+ * will be: \Sum 1024*y^n.
  *
- * We can compute this reasonably efficiently by combining:
- *   y^PERIOD = 1/2 with precomputed \Sum 1024*y^n {for  n <PERIOD}
+ * We can compute this efficiently by combining:
+ * y^32 = 1/2 with precomputed \Sum 1024*y^n   (where n < 32)
  */
-static u32 __compute_runnable_contrib(u64 n)
+static u32 __accumulate_sum(u64 n)
 {
 	u32 contrib = 0;
 
-	if (likely(n <= LOAD_AVG_PERIOD))
-		return runnable_avg_yN_sum[n];
-	else if (unlikely(n >= LOAD_AVG_MAX_N))
-		return LOAD_AVG_MAX;
+	if (likely(n <= SCHED_AVG_HALFLIFE))
+		return __accumulated_sum_N[n];
+	else if (unlikely(n >= SCHED_AVG_MAX_N))
+		return SCHED_AVG_MAX;
 
-	/* Since n < LOAD_AVG_MAX_N, n/LOAD_AVG_PERIOD < 11 */
-	contrib = __accumulated_sum_N32[n/LOAD_AVG_PERIOD];
-	n %= LOAD_AVG_PERIOD;
-	contrib = decay_load(contrib, n);
-	return contrib + runnable_avg_yN_sum[n];
+	/* Since n < SCHED_AVG_MAX_N, n/SCHED_AVG_HALFLIFE < 11 */
+	contrib = __accumulated_sum_N32[n/SCHED_AVG_HALFLIFE];
+	n %= SCHED_AVG_HALFLIFE;
+	contrib = __decay_sum(contrib, n);
+	return contrib + __accumulated_sum_N[n];
 }
 
 #define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT)
 
 /*
- * We can represent the historical contribution to runnable average as the
- * coefficients of a geometric series.  To do this we sub-divide our runnable
- * history into segments of approximately 1ms (1024us); label the segment that
- * occurred N-ms ago p_N, with p_0 corresponding to the current period, e.g.
+ * We can represent the historical contribution to sched average as the
+ * coefficients of a geometric series.  To do this we divide the history
+ * into segments of approximately 1ms (1024*1024ns); label the segment that
+ * occurred N-1024us ago p_N, with p_0 corresponding to the current period, e.g.
  *
  * [<- 1024us ->|<- 1024us ->|<- 1024us ->| ...
  *      p0            p1           p2
  *     (now)       (~1ms ago)  (~2ms ago)
  *
- * Let u_i denote the fraction of p_i that the entity was runnable.
+ * Let u_i denote the fraction of p_i whose state (runnable/running) we count.
  *
  * We then designate the fractions u_i as our co-efficients, yielding the
- * following representation of historical load:
+ * following representation of a sched metric:
  *   u_0 + u_1*y + u_2*y^2 + u_3*y^3 + ...
  *
- * We choose y based on the with of a reasonably scheduling period, fixing:
- *   y^32 = 0.5
+ * We choose y based on a half-life of 32 periods (which is ~32ms):
+ *   y^32 = 0.5 => y = (0.5)^(1/32)
  *
- * This means that the contribution to load ~32ms ago (u_32) will be weighted
- * approximately half as much as the contribution to load within the last ms
- * (u_0).
+ * where 32 is the number of periods that a past period's contribution is
+ * halved. This means that the impact of a period every ~32ms ago will be
+ * as much as 50% of the previous value.
  *
  * When a period "rolls over" and we have new u_0`, multiplying the previous
  * sum again by y is sufficient to update:
- *   load_avg = u_0` + y*(u_0 + u_1*y + u_2*y^2 + ... )
- *            = u_0 + u_1*y + u_2*y^2 + ... [re-labeling u_i --> u_{i+1}]
+ *   avg = u_0` + y*(u_0 + u_1*y + u_2*y^2 + ... )
+ *       = u_0 + u_1*y + u_2*y^2 + ... [re-labeling u_i --> u_{i+1}]
  */
 static __always_inline int
-__update_load_avg(u64 now, int cpu, struct sched_avg *sa,
-		  unsigned long weight, int running, struct cfs_rq *cfs_rq)
+__update_sched_avg(u64 now, int cpu, struct sched_avg *sa,
+		   unsigned long weight, int running, struct cfs_rq *cfs_rq)
 {
 	u64 delta, scaled_delta, periods;
 	u32 contrib;
@@ -2759,15 +2763,15 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
 		periods = delta / 1024;
 		delta %= 1024;
 
-		sa->load_sum = decay_load(sa->load_sum, periods + 1);
+		sa->load_sum = __decay_sum(sa->load_sum, periods + 1);
 		if (cfs_rq) {
 			cfs_rq->runnable_load_sum =
-				decay_load(cfs_rq->runnable_load_sum, periods + 1);
+				__decay_sum(cfs_rq->runnable_load_sum, periods + 1);
 		}
-		sa->util_sum = decay_load((u64)(sa->util_sum), periods + 1);
+		sa->util_sum = __decay_sum((u64)(sa->util_sum), periods + 1);
 
 		/* Efficiently calculate \sum (1..n_period) 1024*y^i */
-		contrib = __compute_runnable_contrib(periods);
+		contrib = __accumulate_sum(periods);
 		contrib = cap_scale(contrib, scale_freq);
 		if (weight) {
 			sa->load_sum += weight * contrib;
@@ -2791,12 +2795,12 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
 	sa->period_contrib += delta;
 
 	if (decayed) {
-		sa->load_avg = div_u64(sa->load_sum, LOAD_AVG_MAX);
+		sa->load_avg = div_u64(sa->load_sum, SCHED_AVG_MAX);
 		if (cfs_rq) {
 			cfs_rq->runnable_load_avg =
-				div_u64(cfs_rq->runnable_load_sum, LOAD_AVG_MAX);
+				div_u64(cfs_rq->runnable_load_sum, SCHED_AVG_MAX);
 		}
-		sa->util_avg = sa->util_sum / LOAD_AVG_MAX;
+		sa->util_avg = sa->util_sum / SCHED_AVG_MAX;
 	}
 
 	return decayed;
@@ -2864,8 +2868,8 @@ void set_task_rq_fair(struct sched_entity *se,
 		p_last_update_time = prev->avg.last_update_time;
 		n_last_update_time = next->avg.last_update_time;
 #endif
-		__update_load_avg(p_last_update_time, cpu_of(rq_of(prev)),
-				  &se->avg, 0, 0, NULL);
+		__update_sched_avg(p_last_update_time, cpu_of(rq_of(prev)),
+				   &se->avg, 0, 0, NULL);
 		se->avg.last_update_time = n_last_update_time;
 	}
 }
@@ -2906,7 +2910,7 @@ static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq)
 
 /* Group cfs_rq's load_avg is used for task_h_load and update_cfs_share */
 static inline int
-update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
+update_cfs_rq_sched_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
 {
 	struct sched_avg *sa = &cfs_rq->avg;
 	int decayed, removed_load = 0, removed_util = 0;
@@ -2914,18 +2918,18 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
 	if (atomic_long_read(&cfs_rq->removed_load_avg)) {
 		s64 r = atomic_long_xchg(&cfs_rq->removed_load_avg, 0);
 		sa->load_avg = max_t(long, sa->load_avg - r, 0);
-		sa->load_sum = max_t(s64, sa->load_sum - r * LOAD_AVG_MAX, 0);
+		sa->load_sum = max_t(s64, sa->load_sum - r * SCHED_AVG_MAX, 0);
 		removed_load = 1;
 	}
 
 	if (atomic_long_read(&cfs_rq->removed_util_avg)) {
 		long r = atomic_long_xchg(&cfs_rq->removed_util_avg, 0);
 		sa->util_avg = max_t(long, sa->util_avg - r, 0);
-		sa->util_sum = max_t(s32, sa->util_sum - r * LOAD_AVG_MAX, 0);
+		sa->util_sum = max_t(s32, sa->util_sum - r * SCHED_AVG_MAX, 0);
 		removed_util = 1;
 	}
 
-	decayed = __update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa,
+	decayed = __update_sched_avg(now, cpu_of(rq_of(cfs_rq)), sa,
 		scale_load_down(cfs_rq->load.weight), cfs_rq->curr != NULL, cfs_rq);
 
 #ifndef CONFIG_64BIT
@@ -2940,7 +2944,7 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq, bool update_freq)
 }
 
 /* Update task and its cfs_rq load average */
-static inline void update_load_avg(struct sched_entity *se, int update_tg)
+static inline void update_sched_avg(struct sched_entity *se, int update_tg)
 {
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 	u64 now = cfs_rq_clock_task(cfs_rq);
@@ -2951,15 +2955,15 @@ static inline void update_load_avg(struct sched_entity *se, int update_tg)
 	 * Track task load average for carrying it to new CPU after migrated, and
 	 * track group sched_entity load average for task_h_load calc in migration
 	 */
-	__update_load_avg(now, cpu, &se->avg,
-			  se->on_rq * scale_load_down(se->load.weight),
-			  cfs_rq->curr == se, NULL);
+	__update_sched_avg(now, cpu, &se->avg,
+			   se->on_rq * scale_load_down(se->load.weight),
+			   cfs_rq->curr == se, NULL);
 
-	if (update_cfs_rq_load_avg(now, cfs_rq, true) && update_tg)
+	if (update_cfs_rq_sched_avg(now, cfs_rq, true) && update_tg)
 		update_tg_load_avg(cfs_rq, 0);
 }
 
-static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void attach_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 	if (!sched_feat(ATTACH_AGE_LOAD))
 		goto skip_aging;
@@ -2969,8 +2973,8 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
 	 * have aged the average right before clearing @last_update_time.
 	 */
 	if (se->avg.last_update_time) {
-		__update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
-				  &se->avg, 0, 0, NULL);
+		__update_sched_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
+				   &se->avg, 0, 0, NULL);
 
 		/*
 		 * XXX: we could have just aged the entire load away if we've been
@@ -2988,11 +2992,11 @@ skip_aging:
 	cfs_rq_util_change(cfs_rq);
 }
 
-static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
+static void detach_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	__update_load_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
-			  &se->avg, se->on_rq * scale_load_down(se->load.weight),
-			  cfs_rq->curr == se, NULL);
+	__update_sched_avg(cfs_rq->avg.last_update_time, cpu_of(rq_of(cfs_rq)),
+			   &se->avg, se->on_rq * scale_load_down(se->load.weight),
+			   cfs_rq->curr == se, NULL);
 
 	cfs_rq->avg.load_avg = max_t(long, cfs_rq->avg.load_avg - se->avg.load_avg, 0);
 	cfs_rq->avg.load_sum = max_t(s64,  cfs_rq->avg.load_sum - se->avg.load_sum, 0);
@@ -3004,7 +3008,7 @@ static void detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
 
 /* Add the load generated by se into cfs_rq's load average */
 static inline void
-enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
+enqueue_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 	struct sched_avg *sa = &se->avg;
 	u64 now = cfs_rq_clock_task(cfs_rq);
@@ -3012,18 +3016,18 @@ enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 
 	migrated = !sa->last_update_time;
 	if (!migrated) {
-		__update_load_avg(now, cpu_of(rq_of(cfs_rq)), sa,
-			se->on_rq * scale_load_down(se->load.weight),
-			cfs_rq->curr == se, NULL);
+		__update_sched_avg(now, cpu_of(rq_of(cfs_rq)), sa,
+				   se->on_rq * scale_load_down(se->load.weight),
+				   cfs_rq->curr == se, NULL);
 	}
 
-	decayed = update_cfs_rq_load_avg(now, cfs_rq, !migrated);
+	decayed = update_cfs_rq_sched_avg(now, cfs_rq, !migrated);
 
 	cfs_rq->runnable_load_avg += sa->load_avg;
 	cfs_rq->runnable_load_sum += sa->load_sum;
 
 	if (migrated)
-		attach_entity_load_avg(cfs_rq, se);
+		attach_entity_sched_avg(cfs_rq, se);
 
 	if (decayed || migrated)
 		update_tg_load_avg(cfs_rq, 0);
@@ -3031,9 +3035,9 @@ enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 
 /* Remove the runnable load generated by se from cfs_rq's runnable load average */
 static inline void
-dequeue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
+dequeue_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
-	update_load_avg(se, 1);
+	update_sched_avg(se, 1);
 
 	cfs_rq->runnable_load_avg =
 		max_t(long, cfs_rq->runnable_load_avg - se->avg.load_avg, 0);
@@ -3066,7 +3070,7 @@ static inline u64 cfs_rq_last_update_time(struct cfs_rq *cfs_rq)
  * Task first catches up with cfs_rq, and then subtract
  * itself from the cfs_rq (task must be off the queue now).
  */
-static void remove_entity_load_avg(struct sched_entity *se)
+static void remove_entity_sched_avg(struct sched_entity *se)
 {
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 	u64 last_update_time;
@@ -3080,7 +3084,8 @@ static void remove_entity_load_avg(struct sched_entity *se)
 
 	last_update_time = cfs_rq_last_update_time(cfs_rq);
 
-	__update_load_avg(last_update_time, cpu_of(rq_of(cfs_rq)), &se->avg, 0, 0, NULL);
+	__update_sched_avg(last_update_time, cpu_of(rq_of(cfs_rq)),
+			   &se->avg, 0, 0, NULL);
 	atomic_long_add(se->avg.load_avg, &cfs_rq->removed_load_avg);
 	atomic_long_add(se->avg.util_avg, &cfs_rq->removed_util_avg);
 }
@@ -3099,7 +3104,7 @@ static int idle_balance(struct rq *this_rq);
 
 #else /* CONFIG_SMP */
 
-static inline void update_load_avg(struct sched_entity *se, int not_used)
+static inline void update_sched_avg(struct sched_entity *se, int not_used)
 {
 	struct cfs_rq *cfs_rq = cfs_rq_of(se);
 	struct rq *rq = rq_of(cfs_rq);
@@ -3108,15 +3113,15 @@ static inline void update_load_avg(struct sched_entity *se, int not_used)
 }
 
 static inline void
-enqueue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
+enqueue_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
 static inline void
-dequeue_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
-static inline void remove_entity_load_avg(struct sched_entity *se) {}
+dequeue_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
+static inline void remove_entity_sched_avg(struct sched_entity *se) {}
 
 static inline void
-attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
+attach_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
 static inline void
-detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
+detach_entity_sched_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
 
 static inline int idle_balance(struct rq *rq)
 {
@@ -3309,7 +3314,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	if (renorm && !curr)
 		se->vruntime += cfs_rq->min_vruntime;
 
-	enqueue_entity_load_avg(cfs_rq, se);
+	enqueue_entity_sched_avg(cfs_rq, se);
 	account_entity_enqueue(cfs_rq, se);
 	update_cfs_shares(cfs_rq);
 
@@ -3388,7 +3393,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	 * Update run-time statistics of the 'current'.
 	 */
 	update_curr(cfs_rq);
-	dequeue_entity_load_avg(cfs_rq, se);
+	dequeue_entity_sched_avg(cfs_rq, se);
 
 	if (schedstat_enabled())
 		update_stats_dequeue(cfs_rq, se, flags);
@@ -3468,7 +3473,7 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 		if (schedstat_enabled())
 			update_stats_wait_end(cfs_rq, se);
 		__dequeue_entity(cfs_rq, se);
-		update_load_avg(se, 1);
+		update_sched_avg(se, 1);
 	}
 
 	update_stats_curr_start(cfs_rq, se);
@@ -3572,7 +3577,7 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
 		/* Put 'current' back into the tree. */
 		__enqueue_entity(cfs_rq, prev);
 		/* in !on_rq case, update occurred at dequeue */
-		update_load_avg(prev, 0);
+		update_sched_avg(prev, 0);
 	}
 	cfs_rq->curr = NULL;
 }
@@ -3588,7 +3593,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
 	/*
 	 * Ensure that runnable average is periodically updated.
 	 */
-	update_load_avg(curr, 1);
+	update_sched_avg(curr, 1);
 	update_cfs_shares(cfs_rq);
 
 #ifdef CONFIG_SCHED_HRTICK
@@ -4461,7 +4466,7 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 		if (cfs_rq_throttled(cfs_rq))
 			break;
 
-		update_load_avg(se, 1);
+		update_sched_avg(se, 1);
 		update_cfs_shares(cfs_rq);
 	}
 
@@ -4521,7 +4526,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 		if (cfs_rq_throttled(cfs_rq))
 			break;
 
-		update_load_avg(se, 1);
+		update_sched_avg(se, 1);
 		update_cfs_shares(cfs_rq);
 	}
 
@@ -5418,7 +5423,7 @@ static void migrate_task_rq_fair(struct task_struct *p)
 	 * will result in the wakee task is less decayed, but giving the wakee more
 	 * load sounds not bad.
 	 */
-	remove_entity_load_avg(&p->se);
+	remove_entity_sched_avg(&p->se);
 
 	/* Tell new CPU we are migrated */
 	p->se.avg.last_update_time = 0;
@@ -5429,7 +5434,7 @@ static void migrate_task_rq_fair(struct task_struct *p)
 
 static void task_dead_fair(struct task_struct *p)
 {
-	remove_entity_load_avg(&p->se);
+	remove_entity_sched_avg(&p->se);
 }
 #endif /* CONFIG_SMP */
 
@@ -6310,7 +6315,7 @@ static void update_blocked_averages(int cpu)
 		if (throttled_hierarchy(cfs_rq))
 			continue;
 
-		if (update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true))
+		if (update_cfs_rq_sched_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true))
 			update_tg_load_avg(cfs_rq, 0);
 	}
 	raw_spin_unlock_irqrestore(&rq->lock, flags);
@@ -6371,7 +6376,7 @@ static inline void update_blocked_averages(int cpu)
 
 	raw_spin_lock_irqsave(&rq->lock, flags);
 	update_rq_clock(rq);
-	update_cfs_rq_load_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true);
+	update_cfs_rq_sched_avg(cfs_rq_clock_task(cfs_rq), cfs_rq, true);
 	raw_spin_unlock_irqrestore(&rq->lock, flags);
 }
 
@@ -8388,7 +8393,7 @@ static void detach_task_cfs_rq(struct task_struct *p)
 	}
 
 	/* Catch up with the cfs_rq and remove our load when we leave */
-	detach_entity_load_avg(cfs_rq, se);
+	detach_entity_sched_avg(cfs_rq, se);
 }
 
 static void attach_task_cfs_rq(struct task_struct *p)
@@ -8405,7 +8410,7 @@ static void attach_task_cfs_rq(struct task_struct *p)
 #endif
 
 	/* Synchronize task with its cfs_rq */
-	attach_entity_load_avg(cfs_rq, se);
+	attach_entity_sched_avg(cfs_rq, se);
 
 	if (!vruntime_normalized(p))
 		se->vruntime += cfs_rq->min_vruntime;
@@ -8544,7 +8549,7 @@ void unregister_fair_sched_group(struct task_group *tg)
 
 	for_each_possible_cpu(cpu) {
 		if (tg->se[cpu])
-			remove_entity_load_avg(tg->se[cpu]);
+			remove_entity_sched_avg(tg->se[cpu]);
 
 		/*
 		 * Only empty task groups can be destroyed; so we can speculatively
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index e51145e..3432985 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1764,7 +1764,7 @@ DECLARE_PER_CPU(struct update_util_data *, cpufreq_update_util_data);
  * @max: Utilization ceiling.
  *
  * This function is called by the scheduler on every invocation of
- * update_load_avg() on the CPU whose utilization is being updated.
+ * update_sched_avg() on the CPU whose utilization is being updated.
  *
  * It can only be called from RCU-sched read-side critical sections.
  */
-- 
1.7.9.5

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