cpufreq / sched: SCHED_CPUFREQ_IOWAIT flag to indicate iowait condition

[cascardo/linux.git] / kernel / sched / fair.c

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5d558cc..a5cd07b 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4500,6 +4500,14 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
        struct cfs_rq *cfs_rq;
        struct sched_entity *se = &p->se;
 
+       /*
+        * If in_iowait is set, the code below may not trigger any cpufreq
+        * utilization updates, so do it here explicitly with the IOWAIT flag
+        * passed.
+        */
+       if (p->in_iowait)
+               cpufreq_update_this_cpu(rq, SCHED_CPUFREQ_IOWAIT);
+
        for_each_sched_entity(se) {
                if (se->on_rq)
                        break;