netdev - Re: [PATCH net-next 4/4] net: af_unix: implement splice for stream af

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Date:	Wed, 20 May 2015 23:47:58 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Cong Wang <cwang@...pensource.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 4/4] net: af_unix: implement splice for stream
 af_unix sockets

Hi Cong,

On Wed, May 20, 2015, at 22:59, Cong Wang wrote:
> On Wed, May 20, 2015 at 8:35 AM, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
> >
> > -static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg,
> > -                              size_t size, int flags)
> > +struct unix_stream_read_state {
> > +       int (*recv_actor)(struct sk_buff *, int, int,
> > +                         struct unix_stream_read_state *);
> > +       struct socket *socket;
> > +       struct msghdr *msg;
> > +       struct pipe_inode_info *pipe;
> > +       size_t size;
> > +       int flags;
> > +       unsigned int splice_flags;
> > +};
> > +
> > +static __always_inline
> > +int unix_stream_read_generic(struct unix_stream_read_state *state)
> 
> 
> Why __always_inline here?

During benchmarking I discovered that the simple ordinary recvmsg case
lost a bit in performance because of the indirection. With
__always_inline -ing unix_stream_read_generic I got it to almost the
same numbers again as without the change. Thus I decided to leave it
there.

Also, thank you for your other feedback. I will address it soon after
letting the patches receiving a bit more feedback.

Thanks,
Hannes
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