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Subject[PATCH -mm 0/3] Freezer: Use wait queue instead of busy looping

The patches in the next three messages do the following:
* make the freezer a bit more verbose
* make try_to_freeze_tasks() go to sleep while waiting for tasks to enter
the refrigerator instead of busy looping
* make try_to_freeze_tasks() measure the time of freezing, regardless of
whether or not it is successful


"Premature optimization is the root of all evil." - Donald Knuth

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