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

From: Prarit Bhargava
Date: Tue Mar 08 2016 - 06:03:31 EST

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

[root@intel-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


> Thanks,
> tglx