linux-kernel - Re: [PATCH 5/6] writeback: rename nr_reclaimable to nr_dirty in balance_dirty

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Message-ID: <20240326122701.e32op43zxuowjvgj@quack3>
Date: Tue, 26 Mar 2024 13:27:01 +0100
From: Jan Kara <jack@...e.cz>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: akpm@...ux-foundation.org, tj@...nel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	willy@...radead.org, bfoster@...hat.com, jack@...e.cz,
	dsterba@...e.com, mjguzik@...il.com, dhowells@...hat.com,
	peterz@...radead.org
Subject: Re: [PATCH 5/6] writeback: rename nr_reclaimable to nr_dirty in
 balance_dirty_pages

On Wed 20-03-24 19:02:21, Kemeng Shi wrote:
> Commit 8d92890bd6b85 ("mm/writeback: discard NR_UNSTABLE_NFS, use
> NR_WRITEBACK instead") removed NR_UNSTABLE_NFS and nr_reclaimable
> only contains dirty page now.
> Rename nr_reclaimable to nr_dirty properly.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  mm/page-writeback.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index ba1b6b5ae5d6..481b6bf34c21 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -1695,7 +1695,7 @@ static int balance_dirty_pages(struct bdi_writeback *wb,
>  	struct dirty_throttle_control * const mdtc = mdtc_valid(&mdtc_stor) ?
>  						     &mdtc_stor : NULL;
>  	struct dirty_throttle_control *sdtc;
> -	unsigned long nr_reclaimable;	/* = file_dirty */
> +	unsigned long nr_dirty;
>  	long period;
>  	long pause;
>  	long max_pause;
> @@ -1716,9 +1716,9 @@ static int balance_dirty_pages(struct bdi_writeback *wb,
>  		unsigned long m_thresh = 0;
>  		unsigned long m_bg_thresh = 0;
>  
> -		nr_reclaimable = global_node_page_state(NR_FILE_DIRTY);
> +		nr_dirty = global_node_page_state(NR_FILE_DIRTY);
>  		gdtc->avail = global_dirtyable_memory();
> -		gdtc->dirty = nr_reclaimable + global_node_page_state(NR_WRITEBACK);
> +		gdtc->dirty = nr_dirty + global_node_page_state(NR_WRITEBACK);
>  
>  		domain_dirty_limits(gdtc);
>  
> @@ -1769,7 +1769,7 @@ static int balance_dirty_pages(struct bdi_writeback *wb,
>  		 * In normal mode, we start background writeout at the lower
>  		 * background_thresh, to keep the amount of dirty memory low.
>  		 */
> -		if (!laptop_mode && nr_reclaimable > gdtc->bg_thresh &&
> +		if (!laptop_mode && nr_dirty > gdtc->bg_thresh &&
>  		    !writeback_in_progress(wb))
>  			wb_start_background_writeback(wb);
>  
> -- 
> 2.30.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR