linux-kernel - Re: Extending page pinning into fs/direct-io.c

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Message-ID: <88983.1685034059@warthog.procyon.org.uk>
Date:   Thu, 25 May 2023 18:00:59 +0100
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Christoph Hellwig <hch@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Extending page pinning into fs/direct-io.c

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> We do have cases that try to use the page coloring that we support.

What do we gain from it?  Presumably since nothing is supposed to write to
that page, it can be shared in all the caches.

David