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-rw-r--r--kernel/sched/fair.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 28cabed85387..ed2ab474ec93 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5363,6 +5363,10 @@ static int wake_wide(struct task_struct *p)
*
* wake_affine_idle() - only considers 'now', it check if the waking CPU is (or
* will be) idle.
+ *
+ * wake_affine_weight() - considers the weight to reflect the average
+ * scheduling latency of the CPUs. This seems to work
+ * for the overloaded case.
*/
static bool
@@ -5378,6 +5382,40 @@ wake_affine_idle(struct sched_domain *sd, struct task_struct *p,
return false;
}
+static bool
+wake_affine_weight(struct sched_domain *sd, struct task_struct *p,
+ int this_cpu, int prev_cpu, int sync)
+{
+ s64 this_eff_load, prev_eff_load;
+ unsigned long task_load;
+
+ this_eff_load = target_load(this_cpu, sd->wake_idx);
+ prev_eff_load = source_load(prev_cpu, sd->wake_idx);
+
+ if (sync) {
+ unsigned long current_load = task_h_load(current);
+
+ if (current_load > this_eff_load)
+ return true;
+
+ this_eff_load -= current_load;
+ }
+
+ task_load = task_h_load(p);
+
+ this_eff_load += task_load;
+ if (sched_feat(WA_BIAS))
+ this_eff_load *= 100;
+ this_eff_load *= capacity_of(prev_cpu);
+
+ prev_eff_load -= task_load;
+ if (sched_feat(WA_BIAS))
+ prev_eff_load *= 100 + (sd->imbalance_pct - 100) / 2;
+ prev_eff_load *= capacity_of(this_cpu);
+
+ return this_eff_load <= prev_eff_load;
+}
+
static int wake_affine(struct sched_domain *sd, struct task_struct *p,
int prev_cpu, int sync)
{
@@ -5387,6 +5425,9 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p,
if (sched_feat(WA_IDLE) && !affine)
affine = wake_affine_idle(sd, p, this_cpu, prev_cpu, sync);
+ if (sched_feat(WA_WEIGHT) && !affine)
+ affine = wake_affine_weight(sd, p, this_cpu, prev_cpu, sync);
+
schedstat_inc(p->se.statistics.nr_wakeups_affine_attempts);
if (affine) {
schedstat_inc(sd->ttwu_move_affine);