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Date: Tue, 13 Feb 2024 08:46:34 -0800
From: "Darrick J. Wong" <djwong@kernel.org>
To: "Pankaj Raghav (Samsung)" <kernel@pankajraghav.com>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	mcgrof@kernel.org, gost.dev@samsung.com, akpm@linux-foundation.org,
	kbusch@kernel.org, chandan.babu@oracle.com, p.raghav@samsung.com,
	linux-kernel@vger.kernel.org, hare@suse.de, willy@infradead.org,
	linux-mm@kvack.org, david@fromorbit.com
Subject: Re: [RFC v2 04/14] readahead: set file_ra_state->ra_pages to be at
 least mapping_min_order
Message-ID: <20240213164634.GV6184@frogsfrogsfrogs>
References: <20240213093713.1753368-1-kernel@pankajraghav.com>
 <20240213093713.1753368-5-kernel@pankajraghav.com>
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In-Reply-To: <20240213093713.1753368-5-kernel@pankajraghav.com>

On Tue, Feb 13, 2024 at 10:37:03AM +0100, Pankaj Raghav (Samsung) wrote:
> From: Luis Chamberlain <mcgrof@kernel.org>
> 
> Set the file_ra_state->ra_pages in file_ra_state_init() to be at least
> mapping_min_order of pages if the bdi->ra_pages is less than that.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>

Looks good to me,
Acked-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  mm/readahead.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/mm/readahead.c b/mm/readahead.c
> index 2648ec4f0494..4fa7d0e65706 100644
> --- a/mm/readahead.c
> +++ b/mm/readahead.c
> @@ -138,7 +138,12 @@
>  void
>  file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)
>  {
> +	unsigned int min_nrpages = mapping_min_folio_nrpages(mapping);
> +	unsigned int max_pages = inode_to_bdi(mapping->host)->io_pages;
> +
>  	ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;
> +	if (ra->ra_pages < min_nrpages && min_nrpages < max_pages)
> +		ra->ra_pages = min_nrpages;
>  	ra->prev_pos = -1;
>  }
>  EXPORT_SYMBOL_GPL(file_ra_state_init);
> -- 
> 2.43.0
> 
>