linux-kernel - Re: [PATCH 0/2 v6] printk, Add monotonic and real printk timestamps

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Message-ID: <56DEB17C.9000201@redhat.com>
Date:	Tue, 08 Mar 2016 06:03:24 -0500
From:	Prarit Bhargava <prarit@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>,
	John Stultz <john.stultz@...aro.org>,
	Xunlei Pang <pang.xunlei@...aro.org>,
	Baolin Wang <baolin.wang@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Petr Mladek <pmladek@...e.cz>, Tejun Heo <tj@...nel.org>,
	Peter Hurley <peter@...leysoftware.com>,
	Vasily Averin <vvs@...tuozzo.com>,
	Joe Perches <joe@...ches.com>
Subject: Re: [PATCH 0/2 v6] printk, Add monotonic and real printk timestamps



On 03/08/2016 02:59 AM, Thomas Gleixner wrote:
> On Tue, 23 Feb 2016, Prarit Bhargava wrote:
> 
>> This patchset adds monotonic and real printk timestamps.  The first patch
>> changes CONFIG_PRINT_TIME from a bool to an int to allow for the additional
>> timestamps that are added in patch 2.
>>
>> Changes from v6: Petr Mladek pointed out that the current patch
>> fails to indicate to userspace programs which timestamp is being used.
> 
> How is that solved?

Hi Thomas,

Userspace programs can now look at /sys/modules/printk/parameters/time which
will contain [0-3] for the timestamp clock.

The file is globally readable so it shouldn't cause any problems for userspace
programs:

[root@...el-wildcatpass-06 dummy-module]# ls -l /sys/module/printk/parameters/time
-rw-r--r--. 1 root root 4096 Mar  8 06:01 /sys/module/printk/parameters/time

P.

> 
> Thanks,
> 
> 	tglx
>