From: Dietmar Eggemann <dietmar.eggem...@arm.com>
To be able to identify the least efficient (costliest) sched group
introduce group_eff as the efficiency of the sched group into sg_lb_stats.
The group efficiency is defined as the ratio between the group usage and
the group energy consumption.
cc: Ingo Molnar <mi...@redhat.com>
cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggem...@arm.com>
---
kernel/sched/fair.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 45c784f..bfa335e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6345,6 +6345,7 @@ struct sg_lb_stats {
unsigned long load_per_task;
unsigned long group_capacity;
unsigned long group_usage; /* Total usage of the group */
+ unsigned long group_eff;
unsigned int sum_nr_running; /* Nr tasks running in the group */
unsigned int idle_cpus;
unsigned int group_weight;
@@ -6715,6 +6716,21 @@ static inline void update_sg_lb_stats(struct lb_env *env,
sgs->group_no_capacity = group_is_overloaded(env, sgs);
sgs->group_type = group_classify(env, group, sgs);
+
+ if (env->use_ea) {
+ struct energy_env eenv = {
+ .sg_top = group,
+ .usage_delta = 0,
+ .src_cpu = -1,
+ .dst_cpu = -1,
+ };
+ unsigned long group_energy = sched_group_energy(&eenv);
+
+ if (group_energy)
+ sgs->group_eff = 1024*sgs->group_usage/group_energy;
+ else
+ sgs->group_eff = ULONG_MAX;
+ }
}
/**
--
1.9.1
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