linux-kernel - Re: [PATCH v2] x86/vdso: implement clock_gettime(CLOCK_MONOTONIC

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Message-ID: <CALCETrW6aE--Fo3qnK2zCAis5C-NraZtie4RBw59DVmzg5K_oA@mail.gmail.com>
Date:   Tue, 4 Jun 2019 10:39:06 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     "Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@...ia.com>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Vas Dias <jason.vas.dias@...il.com>
Subject: Re: [PATCH v2] x86/vdso: implement clock_gettime(CLOCK_MONOTONIC_RAW, ...)

On Tue, Jun 4, 2019 at 9:42 AM Sverdlin, Alexander (Nokia - DE/Ulm)
<alexander.sverdlin@...ia.com> wrote:
>
> From: Alexander Sverdlin <alexander.sverdlin@...ia.com>
>
> Add CLOCK_MONOTONIC_RAW to the existing clock_gettime() vDSO
> implementation. This is based on the ideas of Jason Vas Dias and comments
> of Thomas Gleixner.
>

Can you benchmark this against pulling the mult and shift into the
per-clock base?

--Andy