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Subject[RFC][PATCH 3/8] sched: update the cpu_power sum during load-balance
In order to prepare for a more dynamic cpu_power, update the group sum
while walking the sched domains during load-balance.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/sched.c | 33 +++++++++++++++++++++++++++++----
1 file changed, 29 insertions(+), 4 deletions(-)

Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -3699,6 +3699,28 @@ static inline int check_power_save_busie
}
#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */

+static void update_sched_power(struct sched_domain *sd)
+{
+ 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 */
+ return;
+ }
+
+ sdg->__cpu_power = 0;
+
+ group = child->groups;
+ do {
+ sdg->__cpu_power += group->__cpu_power;
+ group = group->next;
+ } while (group != child->groups);
+
+ if (power != sdg->__cpu_power)
+ sdg->reciprocal_cpu_power = reciprocal_value(sdg->__cpu_power);
+}

/**
* update_sg_lb_stats - Update sched_group's statistics for load balancing.
@@ -3712,7 +3734,8 @@ static inline int check_power_save_busie
* @balance: Should we balance.
* @sgs: variable to hold the statistics for this group.
*/
-static inline void update_sg_lb_stats(struct sched_group *group, int this_cpu,
+static inline void update_sg_lb_stats(struct sched_domain *sd,
+ struct sched_group *group, int this_cpu,
enum cpu_idle_type idle, int load_idx, int *sd_idle,
int local_group, const struct cpumask *cpus,
int *balance, struct sg_lb_stats *sgs)
@@ -3723,8 +3746,11 @@ static inline void update_sg_lb_stats(st
unsigned long sum_avg_load_per_task;
unsigned long avg_load_per_task;

- if (local_group)
+ if (local_group) {
balance_cpu = group_first_cpu(group);
+ if (balance_cpu == this_cpu)
+ update_sched_power(sd);
+ }

/* Tally up the load of all CPUs in the group */
sum_avg_load_per_task = avg_load_per_task = 0;
@@ -3828,7 +3854,7 @@ static inline void update_sd_lb_stats(st
local_group = cpumask_test_cpu(this_cpu,
sched_group_cpus(group));
memset(&sgs, 0, sizeof(sgs));
- update_sg_lb_stats(group, this_cpu, idle, load_idx, sd_idle,
+ update_sg_lb_stats(sd, group, this_cpu, idle, load_idx, sd_idle,
local_group, cpus, balance, &sgs);

if (local_group && balance && !(*balance))
@@ -3863,7 +3889,6 @@ static inline void update_sd_lb_stats(st
update_sd_power_savings_stats(group, sds, local_group, &sgs);
group = group->next;
} while (group != sd->groups);
-
}

/**
--



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