linux-kernel - [PATCH] block: rate-limit capacity change info log

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Message-ID: <20251117053407.70618-1-me@linux.beauty>
Date: Mon, 17 Nov 2025 13:34:07 +0800
From: Li Chen <me@...ux.beauty>
To: Jens Axboe <axboe@...nel.dk>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
Subject: [PATCH] block: rate-limit capacity change info log

From: Li Chen <chenl311@...natelecom.cn>

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@...r.kernel.org
Signed-off-by: Li Chen <chenl311@...natelecom.cn>
---
 block/genhd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9bbc38d12792..bd3a6841e5b5 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -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);
 
 	/*
-- 
2.51.0