[PATCH v2 2/2] md: don't account sync_io if iostats of the disk is disabled
From: <hidden>
Date: 2023-12-15 01:41:17
Also in:
linux-block, lkml
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
From: Li Nan <redacted> If iostats is disabled, disk_stats will not be updated and part_stat_read_accum() only returns a constant value. In this case, continuing to count sync_io and to check is_mddev_idle() is no longer meaningful. Signed-off-by: Li Nan <redacted> --- drivers/md/md.h | 3 ++- drivers/md/md.c | 4 ++++ 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 1a4f976951c1..75f5c5d04e71 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h@@ -589,7 +589,8 @@ static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sect static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) { - md_sync_acct(bio->bi_bdev, nr_sectors); + if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) + md_sync_acct(bio->bi_bdev, nr_sectors); } struct md_personality
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1d71b2a9af03..18bbceb0ffd6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c@@ -8502,6 +8502,10 @@ static int is_mddev_idle(struct mddev *mddev, int init) rcu_read_lock(); rdev_for_each_rcu(rdev, mddev) { struct gendisk *disk = rdev->bdev->bd_disk; + + if (blk_queue_io_stat(mddev->queue)) + continue; + curr_events = (long long)part_stat_read_accum(disk->part0, sectors) - atomic64_read(&disk->sync_io);
--
2.39.2