Messages in this thread Patch in this message | | | From | brookxu <> | Subject | [PATCH v3 11/14] bfq: disable idle for prio_expire under better_fairness | Date | Thu, 25 Mar 2021 14:57:55 +0800 |
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From: Chunguang Xu <brookxu@tencent.com>
Under better_fairness, if higher priority queue is waiting for service,disable queue idle, so that a schedule can be invoked in time. In addition to CLASS_IDLE, other queues allow idle, so that we can better control buffer IO too.
Signed-off-by: Chunguang Xu <brookxu@tencent.com> --- block/bfq-iosched.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index be5b1e3..5aa9c2c 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -4307,6 +4307,14 @@ static bool bfq_better_to_idle(struct bfq_queue *bfqq) return true; /* + * In better_fairness mode, we also put emphasis on Qos. The main + * purpose of allowing idle here is to ensure better isolation + * of Buffer IO. + */ + if (unlikely(bfqd->better_fairness)) + return !(bfqd->bfq_slice_idle == 0 || bfq_class_idle(bfqq)); + + /* * Idling is performed only if slice_idle > 0. In addition, we * do not idle if * (a) bfqq is async @@ -4318,6 +4326,9 @@ static bool bfq_better_to_idle(struct bfq_queue *bfqq) bfq_class_idle(bfqq)) return false; + if (bfq_may_expire_in_serv_for_prio(&bfqq->entity)) + return false; + idling_boosts_thr_with_no_issue = idling_boosts_thr_without_issues(bfqd, bfqq); -- 1.8.3.1
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