linux-kernel - Re: [RFC v2 0/6] x86: dynamic indirect branch promotion

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Message-ID: <A7D88101-837A-4FD2-B397-019D1845A418@vmware.com>
Date:   Mon, 31 Dec 2018 19:53:06 +0000
From:   Nadav Amit <namit@...are.com>
To:     Andy Lutomirski <luto@...nel.org>
CC:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Edward Cree <ecree@...arflare.com>,
        "H . Peter Anvin" <hpa@...or.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 0/6] x86: dynamic indirect branch promotion

> On Dec 31, 2018, at 11:51 AM, Andy Lutomirski <luto@...nel.org> wrote:
> 
> On Sun, Dec 30, 2018 at 11:20 PM Nadav Amit <namit@...are.com> wrote:
>> This is a revised version of optpolines (formerly named retpolines) for
>> dynamic indirect branch promotion in order to reduce retpoline overheads
>> [1].
> 
> Some of your changelogs still call them "relpolines".
> 
> I have a crazy suggestion: maybe don't give them a cute name at all?
> Where it's actually necessary to name them (like in a config option),
> use a description like CONFIG_DYNAMIC_DEVIRTUALIZATION or
> CONFIG_PATCH_INDIRECT_CALLS or something.

I’m totally fine with that (don’t turn me into a "marketing” guy). It was
just a way to refer to the mechanism. I need more feedback about the more
fundamental issues to go on.