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-rw-r--r--kernel/sched.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index af5cd1b2d03..2f28351892c 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4620,6 +4620,28 @@ static inline void schedule_debug(struct task_struct *prev)
#endif
}
+static void put_prev_task(struct rq *rq, struct task_struct *prev)
+{
+ if (prev->state == TASK_RUNNING) {
+ u64 runtime = prev->se.sum_exec_runtime;
+
+ runtime -= prev->se.prev_sum_exec_runtime;
+ runtime = min_t(u64, runtime, 2*sysctl_sched_migration_cost);
+
+ /*
+ * In order to avoid avg_overlap growing stale when we are
+ * indeed overlapping and hence not getting put to sleep, grow
+ * the avg_overlap on preemption.
+ *
+ * We use the average preemption runtime because that
+ * correlates to the amount of cache footprint a task can
+ * build up.
+ */
+ update_avg(&prev->se.avg_overlap, runtime);
+ }
+ prev->sched_class->put_prev_task(rq, prev);
+}
+
/*
* Pick up the highest-prio task:
*/
@@ -4698,7 +4720,7 @@ need_resched_nonpreemptible:
if (unlikely(!rq->nr_running))
idle_balance(cpu, rq);
- prev->sched_class->put_prev_task(rq, prev);
+ put_prev_task(rq, prev);
next = pick_next_task(rq);
if (likely(prev != next)) {