linux-kernel - Re: [PATCH] Docs: admin/kernel-parameters: Add trace

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Message-ID: <19bd0112-9735-49a9-8a5d-076fb0635514@infradead.org>
Date: Mon, 24 Nov 2025 22:00:45 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Jian Zhang <zhangjian.3032@...edance.com>,
 Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>,
 "Borislav Petkov (AMD)" <bp@...en8.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Petr Mladek <pmladek@...e.com>, Feng Tang <feng.tang@...ux.alibaba.com>,
 "Paul E. McKenney" <paulmck@...nel.org>, Kees Cook <kees@...nel.org>,
 Arnd Bergmann <arnd@...db.de>, Frank van der Linden <fvdl@...gle.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] Docs: admin/kernel-parameters: Add trace_clock=tai

On 11/24/25 9:53 PM, Randy Dunlap wrote:
> 
> 
> On 11/24/25 9:34 PM, Jian Zhang wrote:
>> After CLOCK_TAI is added, add missing option trace_clock=tai.
>>
> 
> When/where is CLOCK_TAI added?
> Commit hash?
> Thanks.

I got it. Thanks.

commit 1ff3c9677bff
Author: John Stultz <john.stultz@...aro.org>
Date:   Thu May 3 12:43:40 2012 -0700
    timekeeping: Add CLOCK_TAI clockid

>> Signed-off-by: Jian Zhang <zhangjian.3032@...edance.com>
>> ---
>>  Documentation/admin-guide/kernel-parameters.txt | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
>> index 6c42061ca20e..fdbd2149f321 100644
>> --- a/Documentation/admin-guide/kernel-parameters.txt
>> +++ b/Documentation/admin-guide/kernel-parameters.txt
>> @@ -7452,6 +7452,7 @@
>>  			mono_raw - Use ktime_get_raw_fast_ns() for time
>>  				stamps.
>>  			boot - Use ktime_get_boot_fast_ns() for time stamps.
>> +			tai - Use ktime_get_tai_fast_ns() for time stamps.
>>  			Architectures may add more clocks. See
>>  			Documentation/trace/ftrace.rst for more details.
>>  
> 

-- 
~Randy