Continuous software call-stack profiling

PerfSpect's flame command collects call stack data for a specified duration.

Continuous profiling would provide snapshots of N duration repeated for M duration.

e.g., perfspect flame --duration 30m --interval 2m

would produce 15 timestamped flamegraphs

The flamegraphs can then be correlated with other timestamped activity on the system, e.g., from application log files