linux-kernel - Re: [v3 PATCH] mm: move_pages: report the number of non-attempted pages

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Date:   Mon, 27 Jan 2020 11:35:46 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     mhocko@...e.com, richardw.yang@...ux.intel.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [v3 PATCH] mm: move_pages: report the number of non-attempted
 pages

> @@ -1627,8 +1627,18 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
>  			start = i;
>  		} else if (node != current_node) {
>  			err = do_move_pages_to_node(mm, &pagelist, current_node);
> -			if (err)
> +			if (err) {
> +				/*
> +				 * Possitive err means the number of failed

"positive"

> +				 * pages to migrate.  Since we are going to
> +				 * abort and return the number of non-migrated
> +				 * pages, so need incude the rest of the

"need to include"

> +				 * nr_pages that have not attempted as well.

"have not been attempted"

> @@ -1674,6 +1687,13 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
>  
>  	/* Make sure we do not overwrite the existing error */
>  	err1 = do_move_pages_to_node(mm, &pagelist, current_node);
> +	/*
> +	 * Don't have to report non-attempted pages here since:
> +	 *     - If the above loop is done gracefully there is not non-attempted

"all pages have been attempted"

> +	 *       page.
> +	 *     - If the above loop is aborted to it means more fatal error

s/to// s/more/a/

> +	 *       happened, should return err.
> +	 */   

I'd also be tempted to rename "err" to "ret" since it has meanings beyond
"error" now.