Support QueueSort

[sanposhiho]

QueueSort is used to build a priority queue in the scheduler to determine which Pod should be scheduled first.
Less is called very frequently and if we implemented QueueSortPlugin as we do for other extension points, it'd have a critical performance degradation in building the priority queue in the scheduler.

Concequently, I intentionally didn't include QueueSort in #72, it's not as easy as other extension points.

This issue is to discuss how we deal with QueueSort.

/kind feature

[k8s-triage-robot]

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You can:

• Mark this issue as fresh with /remove-lifecycle stale
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Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[sanposhiho]

/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[sanposhiho]

/remove-lifecycle stale