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    SubjectRe: [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@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

    P.

    >
    > Thanks,
    >
    > tglx
    >

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