linux-kernel - Re: [GIT PULL] iov_iter: Improve page extraction (pin or just list)

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Message-ID: <3520518.1675116740@warthog.procyon.org.uk>
Date:   Mon, 30 Jan 2023 22:12:20 +0000
From:   David Howells <dhowells@...hat.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     dhowells@...hat.com, Jens Axboe <axboe@...nel.dk>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "David Hildenbrand" <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Logan Gunthorpe" <logang@...tatee.com>,
        Jeff Layton <jlayton@...nel.org>, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] iov_iter: Improve page extraction (pin or just list)

John Hubbard <jhubbard@...dia.com> wrote:

> This is something that we say when adding pin_user_pages_fast(),
> yes. I doubt that I can quickly find the email thread, but we
> measured it and weren't immediately able to come up with a way
> to make it faster.

percpu counters maybe - add them up at the point of viewing?

David