linux-kernel - Re: [PATCH v9 20/25] ext4: Convert from readpages to readahead

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Message-ID: <20200320173734.GD851@sol.localdomain>
Date:   Fri, 20 Mar 2020 10:37:34 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-xfs@...r.kernel.org,
        William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, ocfs2-devel@....oracle.com,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-erofs@...ts.ozlabs.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH v9 20/25] ext4: Convert from readpages to readahead

On Fri, Mar 20, 2020 at 07:22:26AM -0700, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> Use the new readahead operation in ext4
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> ---
>  fs/ext4/ext4.h     |  3 +--
>  fs/ext4/inode.c    | 21 +++++++++------------
>  fs/ext4/readpage.c | 22 ++++++++--------------
>  3 files changed, 18 insertions(+), 28 deletions(-)
> 

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

> +		if (rac) {
> +			page = readahead_page(rac);
>  			prefetchw(&page->flags);
> -			list_del(&page->lru);
> -			if (add_to_page_cache_lru(page, mapping, page->index,
> -				  readahead_gfp_mask(mapping)))
> -				goto next_page;
>  		}

Maybe the prefetchw(&page->flags) should be included in readahead_page()?
Most of the callers do it.

- Eric