sched/fair: Fix endless loop in idle_balance()

Check for fair tasks number to decide, that we've pulled a task.
rq's nr_running may contain throttled RT tasks.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1394118975.19290.104.camel@tkhai
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 10db4a8..f1eedae 100644 (file)
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6710,7 +6710,7 @@ static int idle_balance(struct rq *this_rq)
         * While browsing the domains, we released the rq lock.
         * A task could have be enqueued in the meantime
         */
-       if (this_rq->nr_running && !pulled_task) {
+       if (this_rq->cfs.h_nr_running && !pulled_task) {
                pulled_task = 1;
                goto out;
        }