linux-ext4 - [PATCH] jbd2: Increase IO priority of checkpoint.

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Message-Id: <20250825125339.1368799-1-sunjunchao@bytedance.com>
Date: Mon, 25 Aug 2025 20:53:39 +0800
From: Julian Sun <sunjunchao@...edance.com>
To: linux-ext4@...r.kernel.org
Cc: tytso@....edu,
	jack@...e.com,
	yi.zhang@...wei.com
Subject: [PATCH] jbd2: Increase IO priority of checkpoint.

In commit 6a3afb6ac6df ("jbd2: increase the journal IO's priority"),
the priority of IOs initiated by jbd2 has been raised, exempting them
from WBT throttling.
Checkpoint is also a crucial operation of jbd2. While no serious issues
have been observed so far, it should still be reasonable to exempt
checkpoint from WBT throttling.

Signed-off-by: Julian Sun <sunjunchao@...edance.com>
---
 fs/jbd2/checkpoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 38861ca04899..2d0719bf6d87 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -131,7 +131,7 @@ __flush_batch(journal_t *journal, int *batch_count)
 
 	blk_start_plug(&plug);
 	for (i = 0; i < *batch_count; i++)
-		write_dirty_buffer(journal->j_chkpt_bhs[i], REQ_SYNC);
+		write_dirty_buffer(journal->j_chkpt_bhs[i], JBD2_JOURNAL_REQ_FLAGS);
 	blk_finish_plug(&plug);
 
 	for (i = 0; i < *batch_count; i++) {
-- 
2.20.1