linux-kernel - Re: [PATCH 1/3] timekeeping: NMI safe converter from a given time to monotonic

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Message-ID: <87sfg0gvrk.ffs@tglx>
Date:   Tue, 24 Jan 2023 09:51:59 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kan.liang@...ux.intel.com, peterz@...radead.org, mingo@...hat.com,
        jstultz@...gle.com, sboyd@...nel.org, linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, namhyung@...nel.org, ak@...ux.intel.com,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: Re: [PATCH 1/3] timekeeping: NMI safe converter from a given time
 to monotonic

On Mon, Jan 23 2023 at 10:27, kan liang wrote:
> From: Kan Liang <kan.liang@...ux.intel.com>
>
> It's useful to provide a NMI safe function to convert a given time to
> monotonic. For example, the perf_event subsystem wants to convert a TSC
> of a PEBS record to a monotonic clock in a NMI handler.

Why? That's a postprocessing problem, really.

Thanks,

        tglx