Don't check for root

[mennopruijssers]

SystemTap doesn't have to be run as root: here are other options. See the permissions section on it's man page: https://sourceware.org/systemtap/man/stap.1.html

[mennopruijssers]

The output when run without enough permissions is:

$ ./cmd/torch.js 74604 text 10
Sampling 74604 for 10s, outputting text.
[stap stderr] You are trying to run systemtap as a normal user.
You should either be root, or be part of the group "stapusr" and possibly one of the groups "stapsys" or "stapdev".  [man stap]
Try '--help' for more information.

Systemtap exited unexpectedly { type: 1 }
Exiting due to profiling failure.

[mennopruijssers]

3 seconds before your question :)

[danielheller]

lgtm!