linux-kernel - Re: [RFC v2 04/14] readahead: set file_ra_state->ra_pages to be at least mapping_min

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Date: Tue, 13 Feb 2024 15:59:05 +0100
From: Hannes Reinecke <hare@...e.de>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
 linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: mcgrof@...nel.org, gost.dev@...sung.com, akpm@...ux-foundation.org,
 kbusch@...nel.org, djwong@...nel.org, chandan.babu@...cle.com,
 p.raghav@...sung.com, linux-kernel@...r.kernel.org, willy@...radead.org,
 linux-mm@...ck.org, david@...morbit.com
Subject: Re: [RFC v2 04/14] readahead: set file_ra_state->ra_pages to be at
 least mapping_min_order

On 2/13/24 10:37, Pankaj Raghav (Samsung) wrote:
> From: Luis Chamberlain <mcgrof@...nel.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@...nel.org>
> ---
>   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);

Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes