linux-kernel - Re: [PATCH v3 04/11] readahead: rework loop in page_cache_ra

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Date: Mon, 25 Mar 2024 18:41:01 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	gost.dev@...sung.com, chandan.babu@...cle.com, hare@...e.de,
	mcgrof@...nel.org, djwong@...nel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, david@...morbit.com,
	akpm@...ux-foundation.org, Pankaj Raghav <p.raghav@...sung.com>
Subject: Re: [PATCH v3 04/11] readahead: rework loop in
 page_cache_ra_unbounded()

On Wed, Mar 13, 2024 at 06:02:46PM +0100, Pankaj Raghav (Samsung) wrote:
> @@ -239,8 +239,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
>  			 * not worth getting one just for that.
>  			 */
>  			read_pages(ractl);
> -			ractl->_index++;
> -			i = ractl->_index + ractl->_nr_pages - index - 1;
> +			ractl->_index += folio_nr_pages(folio);
> +			i = ractl->_index + ractl->_nr_pages - index;
>  			continue;
>  		}
>  
> @@ -252,13 +252,14 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
>  			folio_put(folio);
>  			read_pages(ractl);
>  			ractl->_index++;
> -			i = ractl->_index + ractl->_nr_pages - index - 1;
> +			i = ractl->_index + ractl->_nr_pages - index;
>  			continue;
>  		}

You changed index++ in the first hunk, but not the second hunk.  Is that
intentional?