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xen-devel
[Xen-devel] [0/3] DomGrp/SchedGrp Merge RFC
On Jan 31, 2008, at 3:04 PM, Mike D. Day wrote:
I think its worth an attempt to merge the scheduling groups with
domain groups. I'll start looking at some of the ideas I mentioned
above, be happy to work with anyone else who wants to have a go.
Hi Mike,
Here's a rough cut of the domgrps/schedgrps merge. It includes a
slightly revised version of domgrps with some enhancements for
performance and compatibility with schedgrps. I'd appreciate your
feedback to make sure the merged result accurately represents your
intent.
DomGrps changes:
- add per-domgrp scheduler-specific data
SchedDom Changes:
- when each domgrp is created, make a csched_dom struct to act as the
group representative
- when doms join the group, delegate its VCPUs to its representative
(instead of a master dom)
- removed group management functions, changes to tools, and command
line interface
As of right now, when a domain joins a group it must relinquish its
VCPU(s) to the group. In the near future I'd like to add the following:
- configuration option choose whether a dom will relinquish its VCPUs
to the group
- modify xm to show whether members have relinquished their VCPUs
- documentation :)
I haven't done any benchmarks, but on the fast path the extra code
should be nearly identical to your original schedgrps implementation,
so performance should be the very similar. Other than the merge
itself, the practical benefit is that schegrps are now persistent
across reboots and host migration (although I haven't tested the
latter).
The attached patches should apply cleanly to xen-unstable.hg cs
16975. The intended patch order is: domgrps-vmm.patch,
schedgrps.patch, domgrps-tools.patch.
Cheers,
Chris
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