linux-kernel - Re: [PATCH net-next v2 10/17] nvme: Use sendmsg(MSG_SPLICE

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Date:   Sun, 18 Jun 2023 18:28:41 +0100
From:   David Howells <dhowells@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     dhowells@...hat.com, netdev@...r.kernel.org,
        Alexander Duyck <alexander.duyck@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Keith Busch <kbusch@...nel.org>,
        Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH net-next v2 10/17] nvme: Use sendmsg(MSG_SPLICE_PAGES) rather then sendpage

Willem de Bruijn <willemdebruijn.kernel@...il.com> wrote:

>     struct bio_vec bvec;
>     struct msghdr msg = { .msg_flags = MSG_SPLICE_PAGES | ... };
> 
>     ..
> 
>     bvec_set_virt
>     iov_iter_bvec
>     sock_sendmsg
> 
> is a frequent pattern. Does it make sense to define a wrapper? Same for bvec_set_page.

I dunno.  I'm trying to move towards aggregating multiple pages in a bvec
before calling sendmsg if possible rather than doing it one page at a time,
but it's easier and more obvious in some places than others.

David