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

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Message-ID: <o4muibdbkbbgwpxgepzc2cwmtavovjathzn5zonxcjjkajyv57@xkfbtkef73ss>
Date: Fri, 20 Dec 2024 17:12:38 +0200
From: "Kirill A. Shutemov" <kirill@...temov.name>
To: David Hildenbrand <david@...hat.com>
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, 
	willy@...radead.org, bfoster@...hat.com, Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 04/11] mm: add PG_dropbehind folio flag

On Fri, Dec 20, 2024 at 04:03:44PM +0100, David Hildenbrand wrote:
> On 20.12.24 12:08, 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.
> 
> I wonder of there are some use cases where we write a lot of data to then
> only consume it read-only from that point on (databases? fancy AI stuff? no
> idea :) ).

Do we use PG_reclaim for such cases?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov