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

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Message-ID: <aS4HmeRgsStngE5v@google.com>
Date: Mon, 1 Dec 2025 21:24:41 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Matthew Wilcox <willy@...radead.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 12/01, Matthew Wilcox wrote:
> 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?

That's why I posted a series of the patches to provide more details. Could you
please check the last patch in the series to show fadvise() does not increase
the folio order?

https://lore.kernel.org/linux-f2fs-devel/20251201210152.909339-5-jaegeuk@kernel.org/T/#u