sched: Implement dynamic cpu_power

Recompute the cpu_power for each cpu during load-balance.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Gautham R Shenoy <ego@in.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
LKML-Reference: <20090901083826.162033479@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 35 insertions, 3 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 55112261027..036600fd70b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3699,14 +3699,46 @@ static inline int check_power_save_busiest_group(struct sd_lb_stats *sds,
 }
 #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */
 
-static void update_sched_power(struct sched_domain *sd)
+unsigned long __weak arch_smt_gain(struct sched_domain *sd, int cpu)
+{
+        unsigned long weight = cpumask_weight(sched_domain_span(sd));
+        unsigned long smt_gain = sd->smt_gain;
+
+        smt_gain /= weight;
+
+        return smt_gain;
+}
+
+static void update_cpu_power(struct sched_domain *sd, int cpu)
+{
+        unsigned long weight = cpumask_weight(sched_domain_span(sd));
+        unsigned long power = SCHED_LOAD_SCALE;
+        struct sched_group *sdg = sd->groups;
+        unsigned long old = sdg->__cpu_power;
+
+        /* here we could scale based on cpufreq */
+
+        if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {
+                power *= arch_smt_gain(sd, cpu);
+                power >>= SCHED_LOAD_SHIFT;
+        }
+
+        /* here we could scale based on RT time */
+
+        if (power != old) {
+                sdg->__cpu_power = power;
+                sdg->reciprocal_cpu_power = reciprocal_value(power);
+        }
+}
+
+static 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 = sdg->__cpu_power;
 
         if (!child) {
-                /* compute cpu power for this cpu */
+                update_cpu_power(sd, cpu);
                 return;
         }
 
@@ -3749,7 +3781,7 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
         if (local_group) {
                 balance_cpu = group_first_cpu(group);
                 if (balance_cpu == this_cpu)
-                        update_sched_power(sd);
+                        update_group_power(sd, this_cpu);
         }
 
         /* Tally up the load of all CPUs in the group */