linux-kernel - Re: [RFC v2 1/6] x86: introduce kernel restartable sequence

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Date:   Thu, 3 Jan 2019 15:40:29 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        David Woodhouse <dwmw@...zon.co.uk>
Subject: Re: [RFC v2 1/6] x86: introduce kernel restartable sequence

> Thanks for the explanations. I don’t think it would work (e.g., IRQs). I can
> avoid generalizing and just detect the "magic sequence” of the code, but let
> me give it some more thought.

If you ask me I would just use compiler profile feedback or autofdo (if your
compiler has a working version)

The compiler can do a much better job at optimizing this than you ever could.

Manual FDO needs some kernel patching though.

-Andi