consider supporting kernel trace data input

[ThinkOpenly]

Add support for parsing output from reading the kernel trace buffer (usually /sys/kernel/debug/tracing/trace). This is text-based:

 sshd-15165 [000] .... 4338237.604419: sys_enter: NR 142 (e, 1001a717b30, 1001a729ee0, 0, 0, 2008)
 sshd-15165 [000] d... 4338237.604424: sched_switch: prev_comm=sshd prev_pid=15165 prev_prio=120 prev_state=S ==> next_comm=swapper/0 next_pid=0 next_prio=120
 bash-15453 [004] .... 4338237.604655: sched_process_exec: filename=/bin/cat pid=15453 old_pid=15453
 bash-15453 [004] .... 4338237.604658: sys_exit: NR 0 = 0
 bash-15453 [004] .... 4338237.604690: sys_enter: NR 45 (0, 0, 3fff7d6b0000, 3fffe5aac332, 80, 3fff7d6f0680)
 bash-15453 [004] .... 4338237.604691: sys_exit: NR 45 = 1099686346752