linux-kernel - Re: [PATCH 3/4] mm/readahead: add a_ops->ra_folio

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Message-ID: <aS4GgfzfuYRHJdg_@casper.infradead.org>
Date: Mon, 1 Dec 2025 21:20:01 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
	linux-mm@...ck.org
Subject: Re: [PATCH 3/4] mm/readahead: add a_ops->ra_folio_order to get a
 desired folio order

On Mon, Dec 01, 2025 at 09:01:26PM +0000, Jaegeuk Kim wrote:
> This patch introduces a new address operation, a_ops->ra_folio_order(), which
> proposes a new folio order based on the adjusted order for page_cache_sync_ra.
> 
> Hence, each filesystem can set the desired minimum order of folio allocation
> when requesting fadvise(POSIX_FADV_WILLNEED).

Again, you've said what but not why.  Does the mm code not ramp up the
folio order sufficiently quickly?  What are you trying to accomplish?