Commit 3179a5f7 authored by Li Chen's avatar Li Chen Committed by Jens Axboe
Browse files

block: rate-limit capacity change info log 



loop devices under heavy stress-ng loop streessor can trigger many
capacity change events in a short time. Each event prints an info
message from set_capacity_and_notify(), flooding the console and
contributing to soft lockups on slow consoles.

Switch the printk in set_capacity_and_notify() to
pr_info_ratelimited() so frequent capacity changes do not spam
the log while still reporting occasional changes.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarLi Chen <chenl311@chinatelecom.cn>
Reviewed-by: default avatarChaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent ade260ca

block/genhd.c

+1 −1
Original line number Diff line number Diff line
@@ -90,7 +90,7 @@ bool set_capacity_and_notify(struct gendisk *disk, sector_t size) 
	    (disk->flags & GENHD_FL_HIDDEN))

		return false;



	pr_info("%s: detected capacity change from %lld to %lld\n",

	pr_info_ratelimited("%s: detected capacity change from %lld to %lld\n",

		disk->disk_name, capacity, size);



	/*