linux-kernel - Re: Folios for 5.15 request - Was: re: Folio discussion recap -

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Date:   Thu, 21 Oct 2021 13:41:55 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        David Howells <dhowells@...hat.com>,
        Hugh Dickins <hughd@...gle.com>
Subject: Re: Folios for 5.15 request - Was: re: Folio discussion recap -

On Thu, Oct 21, 2021 at 02:35:32PM +0200, David Hildenbrand wrote:
> My opinion after all the discussions: use a dedicate type with a clear
> name to solve the immediate filemap API issue. Leave the remainder alone
> for now. Less code to touch, less subsystems to involve (well, still a
> lot), less people to upset, less discussions to have, faster review,
> faster upstream, faster progress. A small but reasonable step.

I didn't change anything I didn't need to.  File pages go onto the
LRU list, so I need to change the LRU code to handle arbitrary-sized
folios instead of pages which are either order-0 or order-9.  Every
function that I convert in this patchset is either used by another
function in this patchset, or by the fs/iomap conversion that I have
staged for the next merge window after folios goes in.