1. 8aacf01 tracing: Add "uptime" trace clock that uses jiffies by Steven Rostedt (Red Hat) · 11 years ago
  2. 8cbd9cc tracing,x86: Add a TSC trace_clock by David Sharp · 12 years ago
  3. 6249687 tracing: Add a counter clock for those that do not trust clocks by Steven Rostedt · 13 years ago
  4. 14131f2 tracing: implement trace_clock_*() APIs by Ingo Molnar · 15 years ago