trace-cmd report: Add -O offset for function plugin

When -O offset is added to trace-cmd report with the function plugin
enabled, it will display the offset of the functions along with their names.
This helps in finding exactly where a function was called by its parent.

 trace-cmd report -O parent -O offset
[..]
        rcuc/163-1330  [163]   740.653251: function: _raw_spin_lock+0x0  <-- rcu_cpu_kthread+0x4d8

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 file changed