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sched/fair: Picking cpus with low OPPs for tasks that prefer idle CPUs

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When idle cpus cannot be found for Top-app/FG tasks, the cpu selection
algorithm picks a cpu with lowest OPP amongst the busy cpus as a second
choice.

Mitigates the "runnable" time for ui and render threads.

bug: 30481949
bug: 30342017
bug: 30508678
Change-Id: I5a97e31d33284895c0fa6f6942102713ee576d77
This commit is contained in:
Srinath Sridharan 2016-08-02 14:05:46 -07:00 • committed by John Stultz
parent b9534b8f01
commit c80a9af21a
1 changed files with 17 additions and 4 deletions
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21
kernel/sched/fair.c
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@ -5651,10 +5651,22 @@ static inline int find_best_target(struct task_struct *p, bool prefer_idle)
if (new_util < cur_capacity) {
if (cpu_rq(i)->nr_running) {
if (target_util == 0 ||
target_util > new_util) {
target_cpu = i;
target_util = new_util;
if(prefer_idle) {
// Find a target cpu with lowest
// utilization.
if (target_util == 0 ||
target_util < new_util) {
target_cpu = i;
target_util = new_util;
}
} else {
// Find a target cpu with highest
// utilization.
if (target_util == 0 ||
target_util > new_util) {
target_cpu = i;
target_util = new_util;
}
}
} else if (!prefer_idle) {
if (best_idle_cpu < 0 ||
@ -5666,6 +5678,7 @@ static inline int find_best_target(struct task_struct *p, bool prefer_idle)
}
} else if (backup_capacity == 0 ||
backup_capacity > cur_capacity) {
// Find a backup cpu with least capacity.
backup_capacity = cur_capacity;
backup_cpu = i;
}