Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Thu, 21 Oct 2021 13:41:55 +0100
From:   Matthew Wilcox <willy@infradead.org>
To:     David Hildenbrand <david@redhat.com>
Cc:     Kent Overstreet <kent.overstreet@gmail.com>,
        Christoph Hellwig <hch@infradead.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        "Darrick J. Wong" <djwong@kernel.org>,
        David Howells <dhowells@redhat.com>,
        Hugh Dickins <hughd@google.com>
Subject: Re: Folios for 5.15 request - Was: re: Folio discussion recap -
Message-ID: <YXFgEzZw/AOJ7AnW@casper.infradead.org>
References: <YW3tkuCUPVICvMBX@cmpxchg.org>
 <20211018231627.kqrnalsi74bgpoxu@box.shutemov.name>
 <YW7hQlny+Go1K3LT@cmpxchg.org>
 <996b3ac4-1536-2152-f947-aad6074b046a@redhat.com>
 <YXBRPSjPUYnoQU+M@casper.infradead.org>
 <436a9f9c-d5af-7d12-b7d2-568e45ffe0a0@redhat.com>
 <YXEOCIWKEcUOvVtv@infradead.org>
 <f31af20e-245d-a8f1-49fa-e368de9fa95c@redhat.com>
 <YXFXGeYlGFsuHz/T@moria.home.lan>
 <2fc2c5da-c0e9-b954-ba48-e258b88e3271@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <2fc2c5da-c0e9-b954-ba48-e258b88e3271@redhat.com>
Precedence: bulk

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.