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    SubjectRe: [PATCH 5/5] Only call rebalance_domains when needed from scheduler_tick
    Christoph Lameter wrote:
    > Only call rebalance_domains when needed from scheduler_tick.
    >
    > Call rebalance_domains from a tasklet with interrupt enabled.
    > Only call it when one of the sched domains is to be rebalanced.
    > The jiffies when the next balancing action is to take place is
    > kept in a per cpu variable next_balance.

    sched-domains was supposed to be able to build a whacky topology
    so you didn't have to take the occasional big latency hit when
    scanning 512 CPUs...

    Ideas were: overlapping, non-covering top level domains, or a
    SD_BALANCE_ROTOR, which scans only N (< all) groups on each
    balance attempt, but more frequently.

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    SUSE Labs, Novell Inc.
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