diff options
| author | Dietmar Eggemann <dietmar.eggemann@arm.com> | 2015-01-20 11:22:35 +0000 |
|---|---|---|
| committer | Robin Randhawa <robin.randhawa@arm.com> | 2015-04-09 12:26:14 +0100 |
| commit | 9c9aa32e3c08cbba3c77bac58fa332ef5b731b05 (patch) | |
| tree | e9228bdbae7d4615203da12215a9f7180e53dd48 | |
| parent | c40def01b8951335927c4d7b7f4c4ff744cc36e9 (diff) | |
sched: Introduce energy awareness into update_sg_lb_stats
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 <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
| -rw-r--r-- | kernel/sched/fair.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f49a4cb35e57..1bbb896346b3 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5908,6 +5908,7 @@ 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; @@ -6263,6 +6264,21 @@ 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; + } } /** |