netdev - Re: [PATCH net-next 1/4] indirect call wrappers: helpers to speed-up indirect calls of builtin

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Message-ID: <8d0e66be95d9a9f0aaf01ab9bf32344629a4b711.camel@redhat.com>
Date:   Tue, 04 Dec 2018 12:27:51 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] indirect call wrappers: helpers to
 speed-up indirect calls of builtin

On Mon, 2018-12-03 at 10:04 -0800, Eric Dumazet wrote:
> On 12/03/2018 03:40 AM, Paolo Abeni wrote:
> > This header define a bunch of helpers that allow avoiding the
> > retpoline overhead when calling builtin functions via function pointers.
> > It boils down to explicitly comparing the function pointers to
> > known builtin functions and eventually invoke directly the latter.
> > 
> > The macros defined here implement the boilerplate for the above schema
> > and will be used by the next patches.
> > 
> > rfc -> v1:
> >  - use branch prediction hint, as suggested by Eric
> > 
> > Suggested-by: Eric Dumazet <Eric Dumazet edumazet@...gle.com>
> > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> > ---
> >  include/linux/indirect_call_wrapper.h | 77 +++++++++++++++++++++++++++
> >  1 file changed, 77 insertions(+)
> >  create mode 100644 include/linux/indirect_call_wrapper.h
> 
> This needs to be discussed more broadly, please include lkml 

Agreed. @David: please let me know if you prefer a repost or a v2 with
the expanded recipients list.

> Also please include Paul Turner <pjt@...gle.com>  in the discussion, since he was
> the inventor of this idea.

I will do.

Thanks,
Paolo