trace-cmd: Add filtering of events
trace-cmd: Add filtering of events

Add the option "-f filter" to come after an event, to enable a filter.

 trace-cmd record -e sched_switch -f next_pid==2314

Signed-off-by: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>

bigzz/trace-cmd,bigzz/trace-cmd