linux-kernel - Re: [PATCH 04/11] mm: add PG

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Message-ID: <Z2WBUX2OKLinNuFZ@casper.infradead.org>
Date: Fri, 20 Dec 2024 14:38:09 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "Kirill A. Shutemov" <kirill@...temov.name>
Cc: Jens Axboe <axboe@...nel.dk>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, hannes@...xchg.org, clm@...a.com,
	linux-kernel@...r.kernel.org, bfoster@...hat.com,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 04/11] mm: add PG_dropbehind folio flag

On Fri, Dec 20, 2024 at 01:08:39PM +0200, Kirill A. Shutemov wrote:
> On Fri, Dec 13, 2024 at 08:55:18AM -0700, Jens Axboe wrote:
> > Add a folio flag that file IO can use to indicate that the cached IO
> > being done should be dropped from the page cache upon completion.
> > 
> > Signed-off-by: Jens Axboe <axboe@...nel.dk>
> 
> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> 
> + David, Vlastimil.
> 
> I think we should consider converting existing folio_set_reclaim() /
> SetPageReclaim() users to the new flag. From a quick scan, all of them
> would benefit from dropping the page after writeback is complete instead
> of leaving the folio on the LRU.

Ooh, that would be nice.  Removes the overloading of PG_reclaim with
PG_readahead, right?