linux-kernel - Re: [PATCH v2 3/3] tracing: Add documentation for trace clock tai

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Message-ID: <0dd9ba0e-712a-37f6-a50d-f5510cd23033@gmail.com>
Date:   Thu, 14 Apr 2022 18:27:07 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>
Cc:     Richard Cochran <richardcochran@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] tracing: Add documentation for trace clock tai

On 4/14/22 16:18, Kurt Kanzenbach wrote:
> +	tai:
> +		This is the tai clock (CLOCK_TAI) and is derived from the wall-
> +		clock time. However, this clock does not experience
> +		discontinuities and backwards jumps caused by NTP inserting leap
> +		seconds. Since the clock access is designed for use in tracing,
> +		side effects are possible. The clock access may yield wrong
> +		readouts in case the internal TAI offset is updated e.g., caused
> +		by setting the system time or using adjtimex() with an offset.
> +		These effects are rare and post processing should be able to
> +		handle them. See comments in the ktime_get_tai_fast_ns()
> +		function for more information.
> +

In what file are the ktime_get_tai_fast_ns() comments?

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