diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 579da278e72f..6e452eb95ac3 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; |