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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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