diff options
| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2015-01-02 17:08:52 +0000 |
|---|---|---|
| committer | Leo Yan <leo.yan@linaro.org> | 2016-05-10 16:49:51 +0800 |
| commit | 5ec8ccabfef3989f4514f22c034a15aeab691110 (patch) | |
| tree | 95d8c0ee5d8e54fe820710e51819d41ce0f11de5 /kernel | |
| parent | b6c0399e0f340887f369c6870ba6a865afe0b0ec (diff) | |
sched: Highest energy aware balancing sched_domain level pointer
Add another member to the family of per-cpu sched_domain shortcut
pointers. This one, sd_ea, points to the highest level at which energy
model is provided. At this level and all levels below all sched_groups
have energy model data attached.
Partial energy model information is possible but restricted to providing
energy model data for lower level sched_domains (sd_ea and below) and
leaving load-balancing on levels above to non-energy-aware
load-balancing. For example, it is possible to apply energy-aware
scheduling within each socket on a multi-socket system and let normal
scheduling handle load-balancing between sockets.
cc: Ingo Molnar <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 11 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 1 |
2 files changed, 11 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2863d223c07e..45e54b0e3669 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5993,11 +5993,12 @@ DEFINE_PER_CPU(int, sd_llc_id); DEFINE_PER_CPU(struct sched_domain *, sd_numa); DEFINE_PER_CPU(struct sched_domain *, sd_busy); DEFINE_PER_CPU(struct sched_domain *, sd_asym); +DEFINE_PER_CPU(struct sched_domain *, sd_ea); static void update_top_cache_domain(int cpu) { struct sched_domain *sd; - struct sched_domain *busy_sd = NULL; + struct sched_domain *busy_sd = NULL, *ea_sd = NULL; int id = cpu; int size = 1; @@ -6018,6 +6019,14 @@ static void update_top_cache_domain(int cpu) sd = highest_flag_domain(cpu, SD_ASYM_PACKING); rcu_assign_pointer(per_cpu(sd_asym, cpu), sd); + + for_each_domain(cpu, sd) { + if (sd->groups->sge) + ea_sd = sd; + else + break; + } + rcu_assign_pointer(per_cpu(sd_ea, cpu), ea_sd); } /* diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 1813cba2995d..a77516a15ba0 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -839,6 +839,7 @@ DECLARE_PER_CPU(int, sd_llc_id); DECLARE_PER_CPU(struct sched_domain *, sd_numa); DECLARE_PER_CPU(struct sched_domain *, sd_busy); DECLARE_PER_CPU(struct sched_domain *, sd_asym); +DECLARE_PER_CPU(struct sched_domain *, sd_ea); struct sched_group_capacity { atomic_t ref; |