"Time police" - best way to submit?

[Henry Hallam]

Thanks Josh.  I had not, and I appreciate the pointer.
Henry

On Fri, Apr 18, 2014 at 1:51 PM, Josh Cartwright <joshc at eso.teric.us> wrote:
> On Wed, Apr 16, 2014 at 02:27:50PM -0700, Henry Hallam wrote:
>> Hi, my name is Henry and I'm a kernel newbie.
>
> Hello, Henry.
>
>> Recently plagued by a perplexing issue where *something* would step
>> the clock on an important server by exactly 5 minutes at infrequent,
>> unpredictable intervals, I put together my first kernel module - a
>> trivial hook into do_settimeofday via a jprobe, that prints the PID,
>> process name and time adjustment to the kernel message log.
>>
>> Here's what I have so far:
>> https://github.com/henryhallam/timepolice
>>
>> Questions:
>>
>> 1. Is a module using kprobes/jprobes the right way to do it, vs adding
>> printks to linux/time/timekeeping.c?
>
> Have you taken a look at the various kernel tracing features?  I suspect
> you could do exactly what you want without modifying the kernel at all
> using the function tracer.
>
>   Josh