| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 276/411] bfq: Remove pointless bfq_init_rq() calls | Date | Mon, 13 Jun 2022 12:09:09 +0200 |
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From: Jan Kara <jack@suse.cz>
commit 5f550ede5edf846ecc0067be1ba80514e6fe7f8e upstream.
We call bfq_init_rq() from request merging functions where requests we get should have already gone through bfq_init_rq() during insert and anyway we want to do anything only if the request is already tracked by BFQ. So replace calls to bfq_init_rq() with RQ_BFQQ() instead to simply skip requests untracked by BFQ. We move bfq_init_rq() call in bfq_insert_request() a bit earlier to cover request merging and thus can transfer FIFO position in case of a merge.
CC: stable@vger.kernel.org Tested-by: "yukuai (C)" <yukuai3@huawei.com> Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220401102752.8599-6-jack@suse.cz Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- block/bfq-iosched.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-)
--- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -2267,8 +2267,6 @@ static int bfq_request_merge(struct requ return ELEVATOR_NO_MERGE; } -static struct bfq_queue *bfq_init_rq(struct request *rq); - static void bfq_request_merged(struct request_queue *q, struct request *req, enum elv_merge type) { @@ -2277,7 +2275,7 @@ static void bfq_request_merged(struct re blk_rq_pos(req) < blk_rq_pos(container_of(rb_prev(&req->rb_node), struct request, rb_node))) { - struct bfq_queue *bfqq = bfq_init_rq(req); + struct bfq_queue *bfqq = RQ_BFQQ(req); struct bfq_data *bfqd; struct request *prev, *next_rq; @@ -2329,8 +2327,8 @@ static void bfq_request_merged(struct re static void bfq_requests_merged(struct request_queue *q, struct request *rq, struct request *next) { - struct bfq_queue *bfqq = bfq_init_rq(rq), - *next_bfqq = bfq_init_rq(next); + struct bfq_queue *bfqq = RQ_BFQQ(rq), + *next_bfqq = RQ_BFQQ(next); if (!bfqq) return; @@ -5514,6 +5512,8 @@ static inline void bfq_update_insert_sta unsigned int cmd_flags) {} #endif /* CONFIG_BFQ_CGROUP_DEBUG */ +static struct bfq_queue *bfq_init_rq(struct request *rq); + static void bfq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, bool at_head) { @@ -5524,6 +5524,7 @@ static void bfq_insert_request(struct bl unsigned int cmd_flags; spin_lock_irq(&bfqd->lock); + bfqq = bfq_init_rq(rq); if (blk_mq_sched_try_insert_merge(q, rq)) { spin_unlock_irq(&bfqd->lock); return; @@ -5531,7 +5532,6 @@ static void bfq_insert_request(struct bl blk_mq_sched_request_inserted(rq); - bfqq = bfq_init_rq(rq); if (!bfqq || at_head || blk_rq_is_passthrough(rq)) { if (at_head) list_add(&rq->queuelist, &bfqd->dispatch);
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