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    SubjectRe: [patch 11/15] sched: prevent interactions between throttled entities and load-balance
    (2011/05/03 18:28), Paul Turner wrote:
    >>From the perspective of load-balance and shares distribution, throttled
    > entities should be invisible.
    >
    > However, both of these operations work on 'active' lists and are not
    > inherently aware of what group hierarchies may be present. In some cases this
    > may be side-stepped (e.g. we could sideload via tg_load_down in load balance)
    > while in others (e.g. update_shares()) it is more difficult to compute without
    > incurring some O(n^2) costs.
    >
    > Instead, track hierarchal throttled state at time of transition. This allows

    hierarchical

    > us to easily identify whether an entity belongs to a throttled hierarchy and
    > avoid incorrect interactions with it.
    >
    > Also, when an entity leaves a throttled hierarchy we need to advance its
    > time averaging for shares averaging so that the elapsed throttled time is not
    > considered as part of the cfs_rq's operation.
    >
    > Signed-off-by: Paul Turner <pjt@google.com>
    > ---

    Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>

    Thanks,
    H.Seto



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