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    SubjectRe: [PATCH 04/23] sched: Change NODE sched_domain group creation
    On Thu, Apr 07, 2011 at 08:09:45AM -0400, Peter Zijlstra wrote:
    > The NODE sched_domain is 'special' in that it allocates sched_groups
    > per CPU, instead of sharing the sched_groups between all CPUs.
    >
    > While this might have some benefits on large NUMA and avoid remote
    > memory accesses when iterating the sched_groups, this does break
    > current code that assumes sched_groups are shared between all
    > sched_domains (since the dynamic cpu_power patches).
    >
    > So refactor the NODE groups to behave like all other groups.
    >
    > (The ALLNODES domain again shared its groups across the CPUs for some
    > reason).
    >
    > If someone does measure a performance decrease due to this change we

    [...]

    Will do some performance sniff tests to check this.


    Andreas

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