linux-kernel - Re: [PATCH v5 0/5] x86/umwait: Enable user wait instructions

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Message-ID: <CALCETrVcnccgOtxzEYqjES3qXKMVofmFfOdcY8y3s4knbw7eow@mail.gmail.com>
Date:   Thu, 20 Jun 2019 09:25:44 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v5 0/5] x86/umwait: Enable user wait instructions

On Wed, Jun 19, 2019 at 6:43 PM Fenghua Yu <fenghua.yu@...el.com> wrote:
> The sysfs interface files are in /sys/devices/system/cpu/umwait_control/

This might be a silly question, but: what do we envision as the use
case for changing the C0.2 setting?  I'm wondering if we'll ever end
up wanting it as a prctl() instead of a sysfs file.