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

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Message-ID: <92281874-51f1-c79c-dbfe-021600a36c9d@gmail.com>
Date:   Mon, 3 Dec 2018 10:04:50 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next 1/4] indirect call wrappers: helpers to speed-up
 indirect calls of builtin



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 

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