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-rw-r--r--kernel/sched.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 579da278e72..6e452eb95ac 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2031,6 +2031,12 @@ static runqueue_t *find_busiest_queue(struct sched_group *group)
}
/*
+ * Max backoff if we encounter pinned tasks. Pretty arbitrary value, but
+ * so long as it is large enough.
+ */
+#define MAX_PINNED_INTERVAL 512
+
+/*
* Check this_cpu to ensure it is balanced within domain. Attempt to move
* tasks if there is an imbalance.
*
@@ -2042,7 +2048,7 @@ static int load_balance(int this_cpu, runqueue_t *this_rq,
struct sched_group *group;
runqueue_t *busiest;
unsigned long imbalance;
- int nr_moved, all_pinned;
+ int nr_moved, all_pinned = 0;
int active_balance = 0;
spin_lock(&this_rq->lock);
@@ -2133,7 +2139,8 @@ out_balanced:
sd->nr_balance_failed = 0;
/* tune up the balancing interval */
- if (sd->balance_interval < sd->max_interval)
+ if ((all_pinned && sd->balance_interval < MAX_PINNED_INTERVAL) ||
+ (sd->balance_interval < sd->max_interval))
sd->balance_interval *= 2;
return 0;