diff options
| author | Shaohua Li <shli@fb.com> | 2016-11-03 17:03:54 -0700 |
|---|---|---|
| committer | Huang, Tao <huangtao@rock-chips.com> | 2017-09-15 09:39:41 +0800 |
| commit | 331eee6d7ee99b8869ccd6f7f2e47edb07b35d55 (patch) | |
| tree | 5f05be319a0a451318f6d8e7667c140e9fbd084c /block | |
| parent | 63e2f4ea2deeef82179d5a3bff76347b2ed738fb (diff) | |
UPSTREAM: 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.
Change-Id: I2bf7fe5749d66e0192c08d16c4bb8d057ad8833f
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
(cherry pick from 600271d9000027c013c01be87cbb90a5a18c5c3f)
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 0d1af3e44efb..aaea6ea66fac 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1377,13 +1377,18 @@ 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); } |