diff options
| -rw-r--r-- | block/bfq-iosched.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 41d9036b18224..62efc1b97afb5 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -3298,6 +3298,27 @@ void bfq_bfqq_expire(struct bfq_data *bfqd, */ } else entity->service = 0; + + /* + * Reset the received-service counter for every parent entity. + * Differently from what happens with bfqq->entity.service, + * the resetting of this counter never needs to be postponed + * for parent entities. In fact, in case bfqq may have a + * chance to go on being served using the last, partially + * consumed budget, bfqq->entity.service needs to be kept, + * because if bfqq then actually goes on being served using + * the same budget, the last value of bfqq->entity.service is + * needed to properly decrement bfqq->entity.budget by the + * portion already consumed. In contrast, it is not necessary + * to keep entity->service for parent entities too, because + * the bubble up of the new value of bfqq->entity.budget will + * make sure that the budgets of parent entities are correct, + * even in case bfqq and thus parent entities go on receiving + * service with the same budget. + */ + entity = entity->parent; + for_each_entity(entity) + entity->service = 0; } /* |