Thanks Josh. I had not, and I appreciate the pointer. Henry On Fri, Apr 18, 2014 at 1:51 PM, Josh Cartwright <[email protected]> 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
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