Hi Ming:
I think it may be due to other reasons, I test this patch seems work fine,
Can you verify it in your environment?
>From 2c7305042e71d0f53ca50a8a3f2eebe6a2dcdb86 Mon Sep 17 00:00:00 2001
From: Chunguang Xu <brookxu@xxxxxxxxxxx>
Date: Thu, 6 Jan 2022 15:18:50 +0800
Subject: [PATCH] blk-throtl: avoid double charge of bio IOPS due to split
After commit 900e08075202("block: move queue enter logic into
blk_mq_submit_bio()"), submit_bio_checks() is moved from the
entrance of the IO stack to the specific submit_bio() entrance.
Therefore, the IO may be splited before entering blk-throtl, so
we need to check whether the BIO is throttled, and only need
to update the io_split_cnt for the throttled bio to avoid
double charge.
Signed-off-by: Chunguang Xu <brookxu@xxxxxxxxxxx>
---
block/blk-throttle.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 39bb6e6..2b12fc7 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2049,6 +2049,9 @@ void blk_throtl_charge_bio_split(struct bio *bio)
struct throtl_service_queue *parent_sq;
bool rw = bio_data_dir(bio);
+ if (!bio_flagged(bio, BIO_THROTTLED))
+ return;
+
do {
if (!parent->has_rules[rw])
break;
--
1.8.3.1
