[buildbot, test this please]

Maybe change the option from "-s" to "-d". We have a few other tools to use "-d" or "-D" to indicate the duration. Not sure whether signal handler is needed here. For example, shmsnoop.py exits after the duration like

start_time = datetime.now()
while not args.duration or datetime.now() - start_time < args.duration:
    try:
        b.perf_buffer_poll(timeout=1000)
    except KeyboardInterrupt:
        exit()

Not 100% precise, but should be close.

Please also modify man page and example file.

I've made changes to the implementation so that it's identical to shmsnoop and I have updated the exampls and man page. I'm not familiar with buildbot, but I'll start looking into how to run the tests.

[buildbot, test this please]

Please let me know if there's anything else you'd like me to add!

[buildbot, test this please]

Looks good. Thanks!