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@xxxxxx>
---
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 f3d27a6..9612306 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1401,13 +1401,18 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio)
*/
plug = current->plug;
if (plug) {
+ struct request *first = NULL;
+
blk_mq_bio_to_request(rq, bio);
if (!request_count)
trace_block_plug(q);
+ else
+ first = list_entry_rq(plug->mq_list.next);
blk_mq_put_ctx(data.ctx);
- if (request_count >= BLK_MAX_REQUEST_COUNT) {
+ if (request_count >= BLK_MAX_REQUEST_COUNT || (first &&
+ blk_rq_bytes(first) >= BLK_PLUG_FLUSH_SIZE)) {
blk_flush_plug_list(plug, false);
trace_block_plug(q);
}
--
2.9.3
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