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The XNU kernel's Edge scheduler implements a hierarchical thread scheduling design for multi-cluster platforms. It operates at three levels: scheduling bucket (using Earliest Deadline First with WCEL values), thread group (using interactivity scoring based on CPU/blocking ratios), and individual thread (using Mach timesharing with priority decay). The Edge scheduler extends clutch scheduling to handle asymmetric multi-cluster systems through per-thread-group cluster recommendations, a migration graph with weighted edges, and per-cluster scheduling latency metrics. Key features include foreign thread rebalancing, shared resource load balancing, and "stir-the-pot" round-robining to prevent stragglers in parallel workloads.

xnu/doc/scheduler/sched_clutch_edge.md at main · apple-oss-distributions/xnu