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SubjectRe: [PATCH v2] sched/fair: update scale invariance of PELT

Lets go back to the unscaled version:

running idle
|*********|---------|

With the current code, that would effectively end up like (again
assuming 50%):

running idle
|*_*_*_*_*|---------|


Time stays the same, but we add extra idle cycles.

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