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    SubjectRe: Scheduler balancing statistics
    The important thing, as always, is that collecting the stats not impact
    the action being taken. If you stick with incrementing counters and
    not taking additional locks, then you've probably done what you can to
    minimize any impact.

    From an analysis standpoint it would be nice to know which of the major
    features are being activated for a particular load. So imbalance-driven
    moves, power-driven moves, and the number of times each domain tried
    to balance and failed would all be useful. I think your output covered

    Another useful stat might be how many times the self-adjusting fields
    (min, max) adjusted themselves. That might yield some insights on
    whether that's working well (or correctly).

    When I started thinking about these stats, I started thinking about how to
    identify the domains. "domain0" and "domain1" do uniquely identify some
    data structures, but especially as they get hierarchical, can we easily
    tie them to the cpus they manage? Perhaps the stats should include a
    bitmap of what cpus are covered by the domain too.

    Looks very useful for those times when some workload causes the scheduler
    to burp -- between scheduler stats and domain stats we may find it much
    easier to track down issues.

    Would you say these would be in addition to the schedstats or would
    these replace them?

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