From: chengkaitao Reference function started_after() Before modification: Timeout for dispatch{read}: 9.5s started_after - 0.5s < latest_start - 10s 9.5s < latest_start - started_after Timeout for dispatch{write}: 5s started_after - 5s < latest_start - 10s 5s < latest_start - started_after At this point, write requests have higher priority than read requests. After modification: Timeout for dispatch{read/write}: 5s prio_aging_expire / 2 < latest_start - started_after Signed-off-by: chengkaitao --- block/mq-deadline.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/mq-deadline.c b/block/mq-deadline.c index b9b7cdf1d3c9..f311168f8dfe 100644 --- a/block/mq-deadline.c +++ b/block/mq-deadline.c @@ -672,7 +672,8 @@ static void dd_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, if (flags & BLK_MQ_INSERT_AT_HEAD) { list_add(&rq->queuelist, &per_prio->dispatch); - rq->fifo_time = jiffies; + rq->fifo_time = jiffies + dd->fifo_expire[data_dir] + - dd->prio_aging_expire / 2; } else { deadline_add_rq_rb(per_prio, rq); -- 2.50.1 (Apple Git-155)