Commit b600455d authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

block: optimise blk_flush_plug_list 



Don't call flush_plug_callbacks if there are no plug callbacks.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
[hch: split from a larger patch]
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211020144119.142582-4-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent dbb6f764

block/blk-core.c

+2 −2
Original line number Diff line number Diff line
@@ -1639,8 +1639,8 @@ EXPORT_SYMBOL(blk_check_plugged); 


void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)

{

	if (!list_empty(&plug->cb_list))

		flush_plug_callbacks(plug, from_schedule);



	if (!rq_list_empty(plug->mq_list))

		blk_mq_flush_plug_list(plug, from_schedule);

	if (unlikely(!from_schedule && plug->cached_rq))