The cost path
How Signal Path decides under constraint.
Placement, preemption, backpressure, failure — the cost function in order.
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Step 01
Placement model
The real cost function, including the fairness constraint most schedulers leave out.
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Step 02
Preemption ladder
What gets evicted first, and which guarantees survive an eviction.
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Step 03
Backpressure
How queue depth turns into admission decisions upstream of the scheduler.
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Step 04
Failure domains
Spread rules, and what they cost you in packing efficiency.