Reconsidering the scheduler's wake_wide() heuristic

The kernel's CPU scheduler is charged with choosing which task to run next, but also with deciding where in a multi-CPU system that task should run. As is often the case, that choice comes down to heuristics — rules of thumb codifying the developers' experience of what tends to work best. One key task-placement heuristic has been in place since 2015, but a recent discussion suggests that it may need to be revisited.

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