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Add initial test for (estimated) utilization

Darryl Green requested to merge github/fork/derkling/test_util_est into master

Created by: derkling

Here is a first simple test for the estimated utilization.

This depends on #1073 extensions being available and it provides a foundation to add additional utilization related tests.

So fare it covers a signal Convergence test, which assumes a single task. Further tests to be added are:

  • Aggregation: to verify the correct aggregation of estimated utilization when multiple tasks are running concurrently or interleaved on the same CPU
  • Migration: to verify the correct migration of the estimated utilization when only a portion of the workload is migrated across CPUs.

Nevertheless, these initial bits are useful to assess the stability and usability of the new ftarce based APIs added in #1073.

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