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-rw-r--r--arch/arm/kernel/topology.c54
-rw-r--r--include/linux/sched.h6
-rw-r--r--kernel/sched/core.c6
-rw-r--r--kernel/sched/fair.c59
4 files changed, 63 insertions, 62 deletions
diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
index 71e1fec..d42a7db 100644
--- a/arch/arm/kernel/topology.c
+++ b/arch/arm/kernel/topology.c
@@ -26,30 +26,30 @@
#include <asm/topology.h>
/*
- * cpu power scale management
+ * cpu capacity scale management
*/
/*
- * cpu power table
+ * cpu capacity table
* This per cpu data structure describes the relative capacity of each core.
* On a heteregenous system, cores don't have the same computation capacity
- * and we reflect that difference in the cpu_power field so the scheduler can
- * take this difference into account during load balance. A per cpu structure
- * is preferred because each CPU updates its own cpu_power field during the
- * load balance except for idle cores. One idle core is selected to run the
- * rebalance_domains for all idle cores and the cpu_power can be updated
- * during this sequence.
+ * and we reflect that difference in the cpu_capacity field so the scheduler
+ * can take this difference into account during load balance. A per cpu
+ * structure is preferred because each CPU updates its own cpu_capacity field
+ * during the load balance except for idle cores. One idle core is selected
+ * to run the rebalance_domains for all idle cores and the cpu_capacity can be
+ * updated during this sequence.
*/
static DEFINE_PER_CPU(unsigned long, cpu_scale);
-unsigned long arch_scale_freq_power(struct sched_domain *sd, int cpu)
+unsigned long arch_scale_freq_capacity(struct sched_domain *sd, int cpu)
{
return per_cpu(cpu_scale, cpu);
}
-static void set_power_scale(unsigned int cpu, unsigned long power)
+static void set_capacity_scale(unsigned int cpu, unsigned long capacity)
{
- per_cpu(cpu_scale, cpu) = power;
+ per_cpu(cpu_scale, cpu) = capacity;
}
#ifdef CONFIG_OF
@@ -62,11 +62,11 @@ struct cpu_efficiency {
* Table of relative efficiency of each processors
* The efficiency value must fit in 20bit and the final
* cpu_scale value must be in the range
- * 0 < cpu_scale < 3*SCHED_POWER_SCALE/2
+ * 0 < cpu_scale < 3*SCHED_CAPACITY_SCALE/2
* in order to return at most 1 when DIV_ROUND_CLOSEST
* is used to compute the capacity of a CPU.
* Processors that are not defined in the table,
- * use the default SCHED_POWER_SCALE value for cpu_scale.
+ * use the default SCHED_CAPACITY_SCALE value for cpu_scale.
*/
static const struct cpu_efficiency table_efficiency[] = {
{"arm,cortex-a15", 3891},
@@ -83,9 +83,9 @@ static unsigned long middle_capacity = 1;
* Iterate all CPUs' descriptor in DT and compute the efficiency
* (as per table_efficiency). Also calculate a middle efficiency
* as close as possible to (max{eff_i} - min{eff_i}) / 2
- * This is later used to scale the cpu_power field such that an
- * 'average' CPU is of middle power. Also see the comments near
- * table_efficiency[] and update_cpu_power().
+ * This is later used to scale the cpu_capacity field such that an
+ * 'average' CPU is of middle capacity. Also see the comments near
+ * table_efficiency[] and update_cpu_capacity().
*/
static void __init parse_dt_topology(void)
{
@@ -141,15 +141,15 @@ static void __init parse_dt_topology(void)
* cpu_scale because all CPUs have the same capacity. Otherwise, we
* compute a middle_capacity factor that will ensure that the capacity
* of an 'average' CPU of the system will be as close as possible to
- * SCHED_POWER_SCALE, which is the default value, but with the
+ * SCHED_CAPACITY_SCALE, which is the default value, but with the
* constraint explained near table_efficiency[].
*/
if (4*max_capacity < (3*(max_capacity + min_capacity)))
middle_capacity = (min_capacity + max_capacity)
- >> (SCHED_POWER_SHIFT+1);
+ >> (SCHED_CAPACITY_SHIFT+1);
else
middle_capacity = ((max_capacity / 3)
- >> (SCHED_POWER_SHIFT-1)) + 1;
+ >> (SCHED_CAPACITY_SHIFT-1)) + 1;
}
@@ -158,20 +158,20 @@ static void __init parse_dt_topology(void)
* boot. The update of all CPUs is in O(n^2) for heteregeneous system but the
* function returns directly for SMP system.
*/
-static void update_cpu_power(unsigned int cpu)
+static void update_cpu_capacity(unsigned int cpu)
{
if (!cpu_capacity(cpu))
return;
- set_power_scale(cpu, cpu_capacity(cpu) / middle_capacity);
+ set_capacity_scale(cpu, cpu_capacity(cpu) / middle_capacity);
- printk(KERN_INFO "CPU%u: update cpu_power %lu\n",
- cpu, arch_scale_freq_power(NULL, cpu));
+ printk(KERN_INFO "CPU%u: update cpu_capacity %lu\n",
+ cpu, arch_scale_freq_capacity(NULL, cpu));
}
#else
static inline void parse_dt_topology(void) {}
-static inline void update_cpu_power(unsigned int cpuid) {}
+static inline void update_cpu_capacity(unsigned int cpuid) {}
#endif
/*
@@ -267,7 +267,7 @@ void store_cpu_topology(unsigned int cpuid)
update_siblings_masks(cpuid);
- update_cpu_power(cpuid);
+ update_cpu_capacity(cpuid);
printk(KERN_INFO "CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
cpuid, cpu_topology[cpuid].thread_id,
@@ -297,7 +297,7 @@ void __init init_cpu_topology(void)
{
unsigned int cpu;
- /* init core mask and power*/
+ /* init core mask and capacity */
for_each_possible_cpu(cpu) {
struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
@@ -307,7 +307,7 @@ void __init init_cpu_topology(void)
cpumask_clear(&cpu_topo->core_sibling);
cpumask_clear(&cpu_topo->thread_sibling);
- set_power_scale(cpu, SCHED_POWER_SCALE);
+ set_capacity_scale(cpu, SCHED_CAPACITY_SCALE);
}
smp_wmb();
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a96f035..322110a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -854,10 +854,10 @@ enum cpu_idle_type {
};
/*
- * Increase resolution of cpu_power calculations
+ * Increase resolution of cpu_capacity calculations
*/
-#define SCHED_POWER_SHIFT 10
-#define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT)
+#define SCHED_CAPACITY_SHIFT 10
+#define SCHED_CAPACITY_SCALE (1L << SCHED_CAPACITY_SHIFT)
/*
* sched-domains (multiprocessor balancing) declarations:
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 07bc78a..7ba4f54 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5249,7 +5249,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
cpulist_scnprintf(str, sizeof(str), sched_group_cpus(group));
printk(KERN_CONT " %s", str);
- if (group->sgc->capacity != SCHED_POWER_SCALE) {
+ if (group->sgc->capacity != SCHED_CAPACITY_SCALE) {
printk(KERN_CONT " (cpu_capacity = %d)",
group->sgc->capacity);
}
@@ -5715,7 +5715,7 @@ build_overlap_sched_groups(struct sched_domain *sd, int cpu)
* domains and no possible iteration will get us here, we won't
* die on a /0 trap.
*/
- sg->sgc->capacity = SCHED_POWER_SCALE * cpumask_weight(sg_span);
+ sg->sgc->capacity = SCHED_CAPACITY_SCALE * cpumask_weight(sg_span);
sg->sgc->capacity_orig = sg->sgc->capacity;
/*
@@ -6921,7 +6921,7 @@ void __init sched_init(void)
#ifdef CONFIG_SMP
rq->sd = NULL;
rq->rd = NULL;
- rq->cpu_capacity = SCHED_POWER_SCALE;
+ rq->cpu_capacity = SCHED_CAPACITY_SCALE;
rq->post_schedule = 0;
rq->active_balance = 0;
rq->next_balance = jiffies;
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 58684f6..dc7d652 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1062,9 +1062,9 @@ static void update_numa_stats(struct numa_stats *ns, int nid)
if (!cpus)
return;
- ns->load = (ns->load * SCHED_POWER_SCALE) / ns->compute_capacity;
+ ns->load = (ns->load * SCHED_CAPACITY_SCALE) / ns->compute_capacity;
ns->task_capacity =
- DIV_ROUND_CLOSEST(ns->compute_capacity, SCHED_POWER_SCALE);
+ DIV_ROUND_CLOSEST(ns->compute_capacity, SCHED_CAPACITY_SCALE);
ns->has_free_capacity = (ns->nr_running < ns->task_capacity);
}
@@ -4370,7 +4370,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
}
/* Adjust by relative CPU capacity of the group */
- avg_load = (avg_load * SCHED_POWER_SCALE) / group->sgc->capacity;
+ avg_load = (avg_load * SCHED_CAPACITY_SCALE) / group->sgc->capacity;
if (local_group) {
this_load = avg_load;
@@ -5609,10 +5609,10 @@ static inline int get_sd_load_idx(struct sched_domain *sd,
static unsigned long default_scale_capacity(struct sched_domain *sd, int cpu)
{
- return SCHED_POWER_SCALE;
+ return SCHED_CAPACITY_SCALE;
}
-unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)
+unsigned long __weak arch_scale_freq_capacity(struct sched_domain *sd, int cpu)
{
return default_scale_capacity(sd, cpu);
}
@@ -5627,7 +5627,7 @@ static unsigned long default_scale_smt_capacity(struct sched_domain *sd, int cpu
return smt_gain;
}
-unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)
+unsigned long __weak arch_scale_smt_capacity(struct sched_domain *sd, int cpu)
{
return default_scale_smt_capacity(sd, cpu);
}
@@ -5658,10 +5658,10 @@ static unsigned long scale_rt_capacity(int cpu)
available = total - avg;
}
- if (unlikely((s64)total < SCHED_POWER_SCALE))
- total = SCHED_POWER_SCALE;
+ if (unlikely((s64)total < SCHED_CAPACITY_SCALE))
+ total = SCHED_CAPACITY_SCALE;
- total >>= SCHED_POWER_SHIFT;
+ total >>= SCHED_CAPACITY_SHIFT;
return div_u64(available, total);
}
@@ -5669,29 +5669,29 @@ static unsigned long scale_rt_capacity(int cpu)
static void update_cpu_capacity(struct sched_domain *sd, int cpu)
{
unsigned long weight = sd->span_weight;
- unsigned long capacity = SCHED_POWER_SCALE;
+ 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))
- capacity *= arch_scale_smt_power(sd, cpu);
+ capacity *= arch_scale_smt_capacity(sd, cpu);
else
capacity *= default_scale_smt_capacity(sd, cpu);
- capacity >>= SCHED_POWER_SHIFT;
+ capacity >>= SCHED_CAPACITY_SHIFT;
}
sdg->sgc->capacity_orig = capacity;
if (sched_feat(ARCH_POWER))
- capacity *= arch_scale_freq_power(sd, cpu);
+ capacity *= arch_scale_freq_capacity(sd, cpu);
else
capacity *= default_scale_capacity(sd, cpu);
- capacity >>= SCHED_POWER_SHIFT;
+ capacity >>= SCHED_CAPACITY_SHIFT;
capacity *= scale_rt_capacity(cpu);
- capacity >>= SCHED_POWER_SHIFT;
+ capacity >>= SCHED_CAPACITY_SHIFT;
if (!capacity)
capacity = 1;
@@ -5780,7 +5780,7 @@ static inline int
fix_small_capacity(struct sched_domain *sd, struct sched_group *group)
{
/*
- * Only siblings can have significantly less than SCHED_POWER_SCALE
+ * Only siblings can have significantly less than SCHED_CAPACITY_SCALE
*/
if (!(sd->flags & SD_SHARE_CPUPOWER))
return 0;
@@ -5845,11 +5845,11 @@ static inline int sg_capacity_factor(struct lb_env *env, struct sched_group *gro
cpus = group->group_weight;
/* smt := ceil(cpus / capacity), assumes: 1 < smt_capacity < 2 */
- smt = DIV_ROUND_UP(SCHED_POWER_SCALE * cpus, capacity_orig);
+ smt = DIV_ROUND_UP(SCHED_CAPACITY_SCALE * cpus, capacity_orig);
capacity_factor = cpus / smt; /* cores */
capacity_factor = min_t(unsigned,
- capacity_factor, DIV_ROUND_CLOSEST(capacity, SCHED_POWER_SCALE));
+ capacity_factor, DIV_ROUND_CLOSEST(capacity, SCHED_CAPACITY_SCALE));
if (!capacity_factor)
capacity_factor = fix_small_capacity(env->sd, group);
@@ -5895,7 +5895,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
/* Adjust by relative CPU capacity of the group */
sgs->group_capacity = group->sgc->capacity;
- sgs->avg_load = (sgs->group_load*SCHED_POWER_SCALE) / sgs->group_capacity;
+ sgs->avg_load = (sgs->group_load*SCHED_CAPACITY_SCALE) / sgs->group_capacity;
if (sgs->sum_nr_running)
sgs->load_per_task = sgs->sum_weighted_load / sgs->sum_nr_running;
@@ -6089,7 +6089,7 @@ static int check_asym_packing(struct lb_env *env, struct sd_lb_stats *sds)
env->imbalance = DIV_ROUND_CLOSEST(
sds->busiest_stat.avg_load * sds->busiest_stat.group_capacity,
- SCHED_POWER_SCALE);
+ SCHED_CAPACITY_SCALE);
return 1;
}
@@ -6118,7 +6118,7 @@ void fix_small_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
imbn = 1;
scaled_busy_load_per_task =
- (busiest->load_per_task * SCHED_POWER_SCALE) /
+ (busiest->load_per_task * SCHED_CAPACITY_SCALE) /
busiest->group_capacity;
if (busiest->avg_load + scaled_busy_load_per_task >=
@@ -6137,7 +6137,7 @@ void fix_small_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
min(busiest->load_per_task, busiest->avg_load);
capa_now += local->group_capacity *
min(local->load_per_task, local->avg_load);
- capa_now /= SCHED_POWER_SCALE;
+ capa_now /= SCHED_CAPACITY_SCALE;
/* Amount of load we'd subtract */
if (busiest->avg_load > scaled_busy_load_per_task) {
@@ -6148,16 +6148,16 @@ void fix_small_imbalance(struct lb_env *env, struct sd_lb_stats *sds)
/* Amount of load we'd add */
if (busiest->avg_load * busiest->group_capacity <
- busiest->load_per_task * SCHED_POWER_SCALE) {
+ busiest->load_per_task * SCHED_CAPACITY_SCALE) {
tmp = (busiest->avg_load * busiest->group_capacity) /
local->group_capacity;
} else {
- tmp = (busiest->load_per_task * SCHED_POWER_SCALE) /
+ tmp = (busiest->load_per_task * SCHED_CAPACITY_SCALE) /
local->group_capacity;
}
capa_move += local->group_capacity *
min(local->load_per_task, local->avg_load + tmp);
- capa_move /= SCHED_POWER_SCALE;
+ capa_move /= SCHED_CAPACITY_SCALE;
/* Move if we gain throughput */
if (capa_move > capa_now)
@@ -6207,7 +6207,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
load_above_capacity =
(busiest->sum_nr_running - busiest->group_capacity_factor);
- load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_POWER_SCALE);
+ load_above_capacity *= (SCHED_LOAD_SCALE * SCHED_CAPACITY_SCALE);
load_above_capacity /= busiest->group_capacity;
}
@@ -6225,7 +6225,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
env->imbalance = min(
max_pull * busiest->group_capacity,
(sds->avg_load - local->avg_load) * local->group_capacity
- ) / SCHED_POWER_SCALE;
+ ) / SCHED_CAPACITY_SCALE;
/*
* if *imbalance is less than the average load per runnable task
@@ -6279,7 +6279,8 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
if (!sds.busiest || busiest->sum_nr_running == 0)
goto out_balanced;
- sds.avg_load = (SCHED_POWER_SCALE * sds.total_load) / sds.total_capacity;
+ sds.avg_load = (SCHED_CAPACITY_SCALE * sds.total_load)
+ / sds.total_capacity;
/*
* If the busiest group is imbalanced the below checks don't
@@ -6378,7 +6379,7 @@ static struct rq *find_busiest_queue(struct lb_env *env,
continue;
capacity = capacity_of(i);
- capacity_factor = DIV_ROUND_CLOSEST(capacity, SCHED_POWER_SCALE);
+ capacity_factor = DIV_ROUND_CLOSEST(capacity, SCHED_CAPACITY_SCALE);
if (!capacity_factor)
capacity_factor = fix_small_capacity(env->sd, group);
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