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

[Kurt Kanzenbach]

On Thu Apr 14 2022, Bagas Sanjaya wrote:
> 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?

In kernel/time/timekeeping.c. That function is introduced in patch #1
and has kernel doc comments. Similar to ktime_get_boot_fast_ns().

Thanks,
Kurt

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