linux-kernel - Re: [PATCH v2 4/6] fs/writeback: only calculate dirtied_before when b

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Date: Mon, 18 Mar 2024 18:10:29 +0100
From: Jan Kara <jack@...e.cz>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz,
	tim.c.chen@...ux.intel.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/6] fs/writeback: only calculate dirtied_before when
 b_io is empty

On Wed 28-02-24 17:19:56, Kemeng Shi wrote:
> The dirtied_before is only used when b_io is not empty, so only calculate
> when b_io is not empty.
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Looks good. Feel free to add:

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

								Honza

> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2105,20 +2105,21 @@ static long wb_writeback(struct bdi_writeback *wb,
>  
>  		spin_lock(&wb->list_lock);
>  
> -		/*
> -		 * Kupdate and background works are special and we want to
> -		 * include all inodes that need writing. Livelock avoidance is
> -		 * handled by these works yielding to any other work so we are
> -		 * safe.
> -		 */
> -		if (work->for_kupdate) {
> -			dirtied_before = jiffies -
> -				msecs_to_jiffies(dirty_expire_interval * 10);
> -		} else if (work->for_background)
> -			dirtied_before = jiffies;
> -
>  		trace_writeback_start(wb, work);
>  		if (list_empty(&wb->b_io)) {
> +			/*
> +			 * Kupdate and background works are special and we want
> +			 * to include all inodes that need writing. Livelock
> +			 * avoidance is handled by these works yielding to any
> +			 * other work so we are safe.
> +			 */
> +			if (work->for_kupdate) {
> +				dirtied_before = jiffies -
> +					msecs_to_jiffies(dirty_expire_interval *
> +							 10);
> +			} else if (work->for_background)
> +				dirtied_before = jiffies;
> +
>  			queue_io(wb, work, dirtied_before);
>  			queued = true;
>  		}
> -- 
> 2.30.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR