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

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Message-ID: <6490402d8401a_37b5c7294c6@willemb.c.googlers.com.notmuch>
Date:   Mon, 19 Jun 2023 07:46:53 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     David Howells <dhowells@...hat.com>,
        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

David Howells wrote:
> 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.

Ok. I just wanted to have your opinion. Fine to leave as is.

Acked-by: Willem de Bruijn <willemb@...gle.com>