sched: Rename capacity related flags

It is better not to think about compute capacity as being equivalent
to "CPU power".  The upcoming "power aware" scheduler work may create
confusion with the notion of energy consumption if "power" is used too
liberally.

Let's rename the following feature flags since they do relate to capacity:

	SD_SHARE_CPUPOWER  -> SD_SHARE_CPUCAPACITY
	ARCH_POWER         -> ARCH_CAPACITY
	NONTASK_POWER      -> NONTASK_CAPACITY

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: linaro-kernel@lists.linaro.org
Cc: Andy Fleming <afleming@freescale.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/n/tip-e93lpnxb87owfievqatey6b5@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/core.c

@@ -872,7 +872,7 @@ static void update_rq_clock_task(struct rq *rq, s64 delta)
 	rq->clock_task += delta;
 
 #if defined(CONFIG_IRQ_TIME_ACCOUNTING) || defined(CONFIG_PARAVIRT_TIME_ACCOUNTING)
-	if ((irq_delta + steal) && sched_feat(NONTASK_POWER))
+	if ((irq_delta + steal) && sched_feat(NONTASK_CAPACITY))
 		sched_rt_avg_update(rq, irq_delta + steal);
 #endif
 }
@@ -5309,7 +5309,7 @@ static int sd_degenerate(struct sched_domain *sd)
 			 SD_BALANCE_NEWIDLE |
 			 SD_BALANCE_FORK |
 			 SD_BALANCE_EXEC |
-			 SD_SHARE_CPUPOWER |
+			 SD_SHARE_CPUCAPACITY |
 			 SD_SHARE_PKG_RESOURCES |
 			 SD_SHARE_POWERDOMAIN)) {
 		if (sd->groups != sd->groups->next)
@@ -5340,7 +5340,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
 				SD_BALANCE_NEWIDLE |
 				SD_BALANCE_FORK |
 				SD_BALANCE_EXEC |
-				SD_SHARE_CPUPOWER |
+				SD_SHARE_CPUCAPACITY |
 				SD_SHARE_PKG_RESOURCES |
 				SD_PREFER_SIBLING |
 				SD_SHARE_POWERDOMAIN);
@@ -5947,7 +5947,7 @@ static int sched_domains_curr_level;
 /*
  * SD_flags allowed in topology descriptions.
  *
- * SD_SHARE_CPUPOWER      - describes SMT topologies
+ * SD_SHARE_CPUCAPACITY      - describes SMT topologies
  * SD_SHARE_PKG_RESOURCES - describes shared caches
  * SD_NUMA                - describes NUMA topologies
  * SD_SHARE_POWERDOMAIN   - describes shared power domain
@@ -5956,7 +5956,7 @@ static int sched_domains_curr_level;
  * SD_ASYM_PACKING        - describes SMT quirks
  */
 #define TOPOLOGY_SD_FLAGS		\
-	(SD_SHARE_CPUPOWER |		\
+	(SD_SHARE_CPUCAPACITY |		\
 	 SD_SHARE_PKG_RESOURCES |	\
 	 SD_NUMA |			\
 	 SD_ASYM_PACKING |		\
@@ -6002,7 +6002,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
 					| 1*SD_BALANCE_FORK
 					| 0*SD_BALANCE_WAKE
 					| 1*SD_WAKE_AFFINE
-					| 0*SD_SHARE_CPUPOWER
+					| 0*SD_SHARE_CPUCAPACITY
 					| 0*SD_SHARE_PKG_RESOURCES
 					| 0*SD_SERIALIZE
 					| 0*SD_PREFER_SIBLING
@@ -6024,7 +6024,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
 	 * Convert topological properties into behaviour.
 	 */
 
-	if (sd->flags & SD_SHARE_CPUPOWER) {
+	if (sd->flags & SD_SHARE_CPUCAPACITY) {
 		sd->imbalance_pct = 110;
 		sd->smt_gain = 1178; /* ~15% */
 

kernel/sched/fair.c

@@ -5672,8 +5672,8 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
 	unsigned long capacity = SCHED_CAPACITY_SCALE;
 	struct sched_group *sdg = sd->groups;
 
-	if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
-		if (sched_feat(ARCH_POWER))
+	if ((sd->flags & SD_SHARE_CPUCAPACITY) && weight > 1) {
+		if (sched_feat(ARCH_CAPACITY))
 			capacity *= arch_scale_smt_capacity(sd, cpu);
 		else
 			capacity *= default_scale_smt_capacity(sd, cpu);
@@ -5683,7 +5683,7 @@ static void update_cpu_capacity(struct sched_domain *sd, int cpu)
 
 	sdg->sgc->capacity_orig = capacity;
 
-	if (sched_feat(ARCH_POWER))
+	if (sched_feat(ARCH_CAPACITY))
 		capacity *= arch_scale_freq_capacity(sd, cpu);
 	else
 		capacity *= default_scale_capacity(sd, cpu);
@@ -5782,7 +5782,7 @@ fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
 	/*
 	 * Only siblings can have significantly less than SCHED_CAPACITY_SCALE
 	 */
-	if (!(sd->flags & SD_SHARE_CPUPOWER))
+	if (!(sd->flags & SD_SHARE_CPUCAPACITY))
 		return 0;
 
 	/*

kernel/sched/features.h

@@ -37,18 +37,18 @@ SCHED_FEAT(CACHE_HOT_BUDDY, true)
 SCHED_FEAT(WAKEUP_PREEMPTION, true)
 
 /*
- * Use arch dependent cpu power functions
+ * Use arch dependent cpu capacity functions
  */
-SCHED_FEAT(ARCH_POWER, true)
+SCHED_FEAT(ARCH_CAPACITY, true)
 
 SCHED_FEAT(HRTICK, false)
 SCHED_FEAT(DOUBLE_TICK, false)
 SCHED_FEAT(LB_BIAS, true)
 
 /*
- * Decrement CPU power based on time not spent running tasks
+ * Decrement CPU capacity based on time not spent running tasks
  */
-SCHED_FEAT(NONTASK_POWER, true)
+SCHED_FEAT(NONTASK_CAPACITY, true)
 
 /*
  * Queue remote wakeups on the target CPU and process them