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authorShaohua Li <shli@fb.com>2016-11-03 17:03:54 -0700
committerJens Axboe <axboe@fb.com>2016-11-03 22:00:38 -0600
commit600271d9000027c013c01be87cbb90a5a18c5c3f (patch)
treeba168ba501b07854f0a0c9dea6c52810d2212da8 /block/blk-mq.c
parent50d24c34403c62ad29e8b6db559d491bae20b4b7 (diff)
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 <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c7
1 files changed, 6 insertions, 1 deletions
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);
}