[RFC][PATCH v5 06/14] sched: create a new field with available capacity

[Vincent Guittot]

This new field power_available reflects the available capacity of a CPU
unlike the cpu_power which reflects the current capacity.

Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
---
 kernel/sched/fair.c  |   14 +++++++++++---
 kernel/sched/sched.h |    3 ++-
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5568980..db9b871 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4584,15 +4584,19 @@ static void update_cpu_power(struct sched_domain *sd, 
int cpu)
        if (!power)
                power = 1;
 
+       cpu_rq(cpu)->cpu_available = power;
+       sdg->sgp->power_available = power;
+
        cpu_rq(cpu)->cpu_power = power;
        sdg->sgp->power = power;
+
 }
 
 void update_group_power(struct sched_domain *sd, int cpu)
 {
        struct sched_domain *child = sd->child;
        struct sched_group *group, *sdg = sd->groups;
-       unsigned long power;
+       unsigned long power, available;
        unsigned long interval;
 
        interval = msecs_to_jiffies(sd->balance_interval);
@@ -4604,7 +4608,7 @@ void update_group_power(struct sched_domain *sd, int cpu)
                return;
        }
 
-       power = 0;
+       power = available = 0;
 
        if (child->flags & SD_OVERLAP) {
                /*
@@ -4614,6 +4618,8 @@ void update_group_power(struct sched_domain *sd, int cpu)
 
                for_each_cpu(cpu, sched_group_cpus(sdg))
                        power += power_of(cpu);
+                       available += available_of(cpu);
+
        } else  {
                /*
                 * !SD_OVERLAP domains can assume that child groups
@@ -4623,11 +4629,13 @@ void update_group_power(struct sched_domain *sd, int 
cpu)
                group = child->groups;
                do {
                        power += group->sgp->power;
+                       available += group->sgp->power_available;
                        group = group->next;
                } while (group != child->groups);
        }
 
-       sdg->sgp->power_orig = sdg->sgp->power = power;
+       sdg->sgp->power_orig = sdg->sgp->power_available = available;
+       sdg->sgp->power = power;
 }
 
 /*
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 22e3f1d..d5a4ec0 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -459,6 +459,7 @@ struct rq {
        struct sched_domain *sd;
 
        unsigned long cpu_power;
+       unsigned long cpu_available;
 
        unsigned char idle_balance;
        /* For active balancing */
@@ -603,7 +604,7 @@ struct sched_group_power {
         * CPU power of this group, SCHED_LOAD_SCALE being max power for a
         * single CPU.
         */
-       unsigned int power, power_orig;
+       unsigned int power, power_orig, power_available;
        unsigned long next_update;
        /*
         * Number of busy cpus in this group.
-- 
1.7.9.5

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