Messages in this thread Patch in this message | | | From | Morten Rasmussen <> | Subject | [RFC PATCH 14/16] sched: Use energy model in select_idle_sibling | Date | Fri, 23 May 2014 19:16:41 +0100 |
| |
Make select_idle_sibling() consider energy when picking an idle cpu.
Only idle cpus are still considered. A more aggressive energy conserving approach could go further and consider partly utilized cpus.
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> --- kernel/sched/fair.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 5a52467..542c2b2 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4644,7 +4644,9 @@ static int select_idle_sibling(struct task_struct *p, int target) struct sched_domain *sd; struct sched_group *sg; int i = task_cpu(p); + int target_energy; +#ifndef CONFIG_SCHED_ENERGY if (idle_cpu(target)) return target; @@ -4653,6 +4655,8 @@ static int select_idle_sibling(struct task_struct *p, int target) */ if (i != target && cpus_share_cache(i, target) && idle_cpu(i)) return i; +#endif + target_energy = energy_diff_task(target, p); /* * Otherwise, iterate the domains and find an elegible idle cpu. @@ -4666,8 +4670,12 @@ static int select_idle_sibling(struct task_struct *p, int target) goto next; for_each_cpu(i, sched_group_cpus(sg)) { + int diff; if (i == target || !idle_cpu(i)) goto next; + diff = energy_diff_task(i, p); + if (diff > target_energy) + goto next; } target = cpumask_first_and(sched_group_cpus(sg), -- 1.7.9.5
| |