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sched: use util instead of capacity to select busy cpu

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If cpus are busy, the cpu selection algorithm was favoring
cpus with lower capacity. This can result in uneven packing
since there will be a bias toward the same cpu until there
is a capacity change. Instead use the utilization so there
is immediate feedback as tasks are assigned

BUG: 30115868

Change-Id: I0ac7ae3ab5d8f2f5a5838c29bb6da2c3e8ef44e8
This commit is contained in:
Todd Kjos
2016-07-13 16:13:47 -07:00
committed by John Stultz
parent 23ed57dbcc
commit d4cda03828
1 changed files with 4 additions and 4 deletions
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8
kernel/sched/fair.c
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@@ -5593,7 +5593,7 @@ static inline int find_best_target(struct task_struct *p, bool boosted)
{
int iter_cpu;
int target_cpu = -1;
int target_capacity = 0;
int target_util = 0;
int backup_capacity = 0;
int best_idle_cpu = -1;
int best_idle_cstate = INT_MAX;
@@ -5649,10 +5649,10 @@ static inline int find_best_target(struct task_struct *p, bool boosted)
if (new_util < cur_capacity) {
if (cpu_rq(i)->nr_running) {
if (target_capacity == 0 ||
target_capacity > cur_capacity) {
if (target_util == 0 ||
target_util > new_util) {
target_cpu = i;
target_capacity = cur_capacity;
target_util = new_util;
}
} else if (!boosted) {
if (best_idle_cpu < 0 ||