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Rework task selection

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_pr242 into master

Fix #926 (closed)

Make the task selection/resolution methods more consistent and strict when used with task name or task PID. This assumes that the simple comm/PID interface is only meant for non-ambigous cases.

Introduce a new way of selecting tasks by using TaskID(pid, comm) named tuples. It allows disambiguation in tricky cases. This include:

  • when just specifying a comm or a PID is ambiguous, you can specify both to remove ambiguity
  • when a specific PID is of interest regardless its task comm (or the opposit), the irrelevant field can be set to None. This gives an explicit way of avoiding the exception that would be raised when specifying an PID or comm alone (i.e. not in a tuple).

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