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Re: [Xen-devel] [PATCH] Scheduling groups, credit scheduler support


My reading of your scheduling groups implementation is that it induces hierarchal relationships (master/slave) between domains. That is, every group has one master and the rest are slaves. Although that implementation has the advantage of being small, the fixed relationship puts implicit limits on the organization of domains and the operations that can be applied to them.

In addition to scheduling, I believe domain groups are applicable to other areas such as domain disaggregation, convenient migration, efficient security policy, etc.. As such, a non-hierarchical group mechanism is desirable.

I submitted a related domain grouping patch in the past (Feb 20, 2007). If anyone is interested, I'd be glad to submit a fresh cut of my patches against the tip as an RFC.


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