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

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Message-ID: <na76bcwkb6567qdr3h2sikczfrhadfvb4dy6s66l5366sujsvz@2hxt2n6kcrnu>
Date: Mon, 25 Aug 2025 15:47:05 +0200
From: Jan Kara <jack@...e.cz>
To: Julian Sun <sunjunchao@...edance.com>
Cc: linux-ext4@...r.kernel.org, tytso@....edu, jack@...e.com, 
	yi.zhang@...wei.com
Subject: Re: [PATCH] jbd2: Increase IO priority of checkpoint.

On Mon 25-08-25 20:53:39, Julian Sun wrote:
> 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>

Makes sense. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  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
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR