From 600271d9000027c013c01be87cbb90a5a18c5c3f Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 3 Nov 2016 17:03:54 -0700 Subject: [PATCH] blk-mq: immediately dispatch big size request This is corresponding part for blk-mq. Disk with multiple hardware queues doesn't need this as we only hold 1 request at most. Signed-off-by: Shaohua Li Signed-off-by: Jens Axboe --- block/blk-mq.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 8d3de5bd4d6f..077c2416a955 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1453,13 +1453,18 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio) */ plug = current->plug; if (plug) { + struct request *last = NULL; + blk_mq_bio_to_request(rq, bio); if (!request_count) trace_block_plug(q); + else + last = list_entry_rq(plug->mq_list.prev); blk_mq_put_ctx(data.ctx); - if (request_count >= BLK_MAX_REQUEST_COUNT) { + if (request_count >= BLK_MAX_REQUEST_COUNT || (last && + blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { blk_flush_plug_list(plug, false); trace_block_plug(q); } -- 2.20.1