From 8a511ba5feec5947bee0635cff8bd796d5f77e3e Mon Sep 17 00:00:00 2001 From: Paolo Valente Date: Thu, 16 Aug 2018 18:51:15 +0200 Subject: block, bfq: readd missing reset of parent-entity service The received-service counter needs to be equal to 0 when an entity is set in service. Unfortunately, commit "block, bfq: fix service being wrongly set to zero in case of preemption" mistakenly removed the resetting of this counter for the parent entities of the bfq_queue being set in service. This commit fixes this issue by resetting service for parent entities, directly on the expiration of the in-service bfq_queue. Fixes: 9fae8dd59ff3 ("block, bfq: fix service being wrongly set to zero in case of preemption") Signed-off-by: Paolo Valente Signed-off-by: Jens Axboe --- block/bfq-iosched.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index 41d9036b1822..62efc1b97afb 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; } /* -- cgit