linux-kernel - Re: [PATCH] x86/split_lock: Restore warn mode (and add a new one) to avoid userspace regression

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Message-ID: <5b8e4b64-2e9c-4cbe-0a56-83043d8de113@igalia.com>
Date:   Thu, 6 Oct 2022 17:58:14 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        "Luck, Tony" <tony.luck@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Cc:     "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "kernel-dev@...lia.com" <kernel-dev@...lia.com>,
        "kernel@...ccoli.net" <kernel@...ccoli.net>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Joshua Ashton <joshua@...ggi.es>,
        Paul Gofman <pgofman@...eweavers.com>,
        Pavel Machek <pavel@...x.de>,
        Pierre-Loup Griffais <pgriffais@...vesoftware.com>,
        Melissa Wen <mwen@...lia.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] x86/split_lock: Restore warn mode (and add a new one) to
 avoid userspace regression

On 06/10/2022 17:15, Thomas Gleixner wrote:
> [...]
> 
> But a way better solution is to add a sysctl knob which allows to
> disable the slowdown mechanics and that allows distros to give the user
> an trivial knob in the GUI to switch to "I don't care. My broken game is
> more important!" mode, while still maintaining the only sensible default
> of preventing damage for the general use case of the generic distro
> kernel.

OK, if nobody opposes I'll work on that sysctl approach then.
Cheers,


Guilherme