perf: Take command-line arguments
perf: Take command-line arguments

These control the period, enable precise sampling, and set the load
latency sampling threshold.

aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6,aclements/sv6,bowlofstew/sv6,aclements/sv6,bowlofstew/sv6,bowlofstew/sv6,aclements/sv6