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    SubjectRe: [patch 3/5] sched: multilevel sbe and sbf

    * Nick Piggin <nickpiggin@yahoo.com.au> wrote:

    > 3/5

    > The fundamental problem that Suresh has with balance on exec and fork
    > is that it only tries to balance the top level domain with the flag
    > set.
    >
    > This was worked around by removing degenerate domains, but is still a
    > problem if people want to start using more complex sched-domains, especially
    > multilevel NUMA that ia64 is already using.
    >
    > This patch makes balance on fork and exec try balancing over not just the
    > top most domain with the flag set, but all the way down the domain tree.
    >
    > Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>

    Acked-by: Ingo Molnar <mingo@elte.hu>

    note that no matter how much scheduler logic, in the end
    cross-scheduling of tasks between nodes on NUMA will always have a
    permanent penalty (i.e. the 'migration cost' is 'infinity' in the long
    run), so the primary focus _hast to be_ on 'get it right initially' When
    tasks must spill over to other nodes will always remain a special case.
    So balance-on-fork/exec/[clone] definitely needs to be aware of the full
    domain tree picture.

    Ingo
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