diff options
Diffstat (limited to 'block/bfq-iosched.c')
| -rw-r--r-- | block/bfq-iosched.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index c7a4a15c7c19..9ea2c4f42501 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -1380,7 +1380,15 @@ static bool bfq_bfqq_update_budg_for_activation(struct bfq_data *bfqd, { struct bfq_entity *entity = &bfqq->entity; - if (bfq_bfqq_non_blocking_wait_rq(bfqq) && arrived_in_time) { + /* + * In the next compound condition, we check also whether there + * is some budget left, because otherwise there is no point in + * trying to go on serving bfqq with this same budget: bfqq + * would be expired immediately after being selected for + * service. This would only cause useless overhead. + */ + if (bfq_bfqq_non_blocking_wait_rq(bfqq) && arrived_in_time && + bfq_bfqq_budget_left(bfqq) > 0) { /* * We do not clear the flag non_blocking_wait_rq here, as * the latter is used in bfq_activate_bfqq to signal |