5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Kara jack@suse.cz
[ Upstream commit 319ff40a542736d67e5bce18635de35d0e7a0bff ]
Commit f00d7c85be9e ("md/raid0: fix up bio splitting.") among other things changed how bio that needs to be split is submitted. Before this commit, we have split the bio, mapped and submitted each part. After this commit, we map only the first part of the split bio and submit the second part unmapped. Due to bio sorting in __submit_bio_noacct() this results in the following request ordering:
9,0 18 1181 0.525037895 15995 Q WS 1479315464 + 63392
Split off chunk-sized (1024 sectors) request:
9,0 18 1182 0.629019647 15995 X WS 1479315464 / 1479316488
Request is unaligned to the chunk so it's split in raid0_make_request(). This is the first part mapped and punted to bio_list:
8,0 18 7053 0.629020455 15995 A WS 739921928 + 1016 <- (9,0) 1479315464
Now raid0_make_request() returns, second part is postponed on bio_list. __submit_bio_noacct() resorts the bio_list, mapped request is submitted to the underlying device:
8,0 18 7054 0.629022782 15995 G WS 739921928 + 1016
Now we take another request from the bio_list which is the remainder of the original huge request. Split off another chunk-sized bit from it and the situation repeats:
9,0 18 1183 0.629024499 15995 X WS 1479316488 / 1479317512 8,16 18 6998 0.629025110 15995 A WS 739921928 + 1016 <- (9,0) 1479316488 8,16 18 6999 0.629026728 15995 G WS 739921928 + 1016 ... 9,0 18 1184 0.629032940 15995 X WS 1479317512 / 1479318536 [libnetacq-write] 8,0 18 7059 0.629033294 15995 A WS 739922952 + 1016 <- (9,0) 1479317512 8,0 18 7060 0.629033902 15995 G WS 739922952 + 1016 ...
This repeats until we consume the whole original huge request. Now we finally get to processing the second parts of the split off requests (in reverse order):
8,16 18 7181 0.629161384 15995 A WS 739952640 + 8 <- (9,0) 1479377920 8,0 18 7239 0.629162140 15995 A WS 739952640 + 8 <- (9,0) 1479376896 8,16 18 7186 0.629163881 15995 A WS 739951616 + 8 <- (9,0) 1479375872 8,0 18 7242 0.629164421 15995 A WS 739951616 + 8 <- (9,0) 1479374848 ...
I guess it is obvious that this IO pattern is extremely inefficient way to perform sequential IO. It also makes bio_list to grow to rather long lengths.
Change raid0_make_request() to map both parts of the split bio. Since we know we are provided with at most chunk-sized bios, we will always need to split the incoming bio at most once.
Fixes: f00d7c85be9e ("md/raid0: fix up bio splitting.") Signed-off-by: Jan Kara jack@suse.cz Reviewed-by: Yu Kuai yukuai3@huawei.com Link: https://lore.kernel.org/r/20230814092720.3931-2-jack@suse.cz Signed-off-by: Song Liu song@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/raid0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index eca0022588c6d..b1df1877c864b 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -640,7 +640,7 @@ static bool raid0_make_request(struct mddev *mddev, struct bio *bio) struct bio *split = bio_split(bio, sectors, GFP_NOIO, &mddev->bio_set); bio_chain(split, bio); - submit_bio_noacct(bio); + raid0_map_submit_bio(mddev, bio); bio = split; }