linux-kernel - Re: [tip:core/printk] printk: Add monotonic, boottime, and realtime timestamps

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Date:   Tue, 26 Sep 2017 11:43:12 -0400
From:   Prarit Bhargava <prarit@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     pmladek@...e.com, olof@...om.net, akpm@...ux-foundation.org,
        joelaf@...gle.com, rostedt@...dmis.org, corbet@....net,
        jpoimboe@...hat.com, sergey.senozhatsky@...il.com, Jason@...c4.com,
        geert+renesas@...der.be, gregkh@...uxfoundation.org,
        cdall@...aro.org, mingo@...nel.org, hpa@...or.com,
        linux-kernel@...r.kernel.org, sboyd@...eaurora.org,
        mcgrof@...nel.org, paulmck@...ux.vnet.ibm.com, npiggin@...il.com,
        keescook@...omium.org, peterz@...radead.org,
        deepa.kernel@...il.com, salyzyn@...roid.com,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/printk] printk: Add monotonic, boottime, and realtime
 timestamps

On 09/26/2017 11:33 AM, Thomas Gleixner wrote:
> On Tue, 26 Sep 2017, Prarit Bhargava wrote:
>> On 09/26/2017 11:26 AM, Thomas Gleixner wrote:
>>> On Tue, 26 Sep 2017, Prarit Bhargava wrote:
>>>
>>>> On 09/26/2017 04:42 AM, tip-bot for Prarit Bhargava wrote:
>>>>> Commit-ID:  310b454a8653ea60d3eb21ce5ab03a282a32fbe1
>>>>> Gitweb:     http://git.kernel.org/tip/310b454a8653ea60d3eb21ce5ab03a282a32fbe1
>>>>> Author:     Prarit Bhargava <prarit@...hat.com>
>>>>> AuthorDate: Mon, 18 Sep 2017 13:51:00 -0400
>>>>> Committer:  Thomas Gleixner <tglx@...utronix.de>
>>>>> CommitDate: Tue, 26 Sep 2017 10:38:07 +0200
>>>>>
>>>>> printk: Add monotonic, boottime, and realtime timestamps
>>>>>
>>>>> printk.time=1/CONFIG_PRINTK_TIME=1 adds a unmodified local hardware clock
>>>>> timestamp to printk messages.  The local hardware clock loses time each
>>>>> day making it difficult to determine exactly when an issue has occurred in
>>>>> the kernel log, and making it difficult to determine how kernel and
>>>>> hardware issues relate to each other.
>>>>>
>>>>> Make printk output different timestamps by adding options for no timestamp,
>>>>> the local hardware clock, monotonic clock, boottime clock, and clock
>>>>> realtime. The default clock can be selected via:
>>>>>
>>>>>  - Kconfig
>>>>>  - Kernel command line parameter
>>>>>  - Sysfs file
>>>>>
>>>>> Note, that existing user space tools might be confused by selecting clock
>>>>> realtime, so handle with care.
>>>>
>>>> pmladek found a compile warning due to printk_time being unused.  I will post a
>>>> v14 on LKML shortly.
>>>
>>> Errm. I applied v12. where the heck is v13?
>>>
>>> And in the applied patch printk_time is used.....
>>
>> Sorry, my mistake I meant v13.
>>
>> This morning pmladek posted about a warning when when CONFIG_PRINTK is not defined:
>>
>> https://marc.info/?l=linux-doc&m=150642667403344&w=2
>>
>> I'm fixing it now for v13.
> 
> Please send a delta patch.
> 

Will do.

P.