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Add sched_ext concept page #116

@dylandreimerink

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@dylandreimerink

We now have pages for sched_ext kfuncs, the struct_ops and its helper library. The only thing that remains is to write a concept page that explain what sched_ext is and how it operates.

Important points to cover:

  • How tasks move from the existing scheduler to SCX
  • SCX core and BPF scheduler divide
  • How does SCX core (roughly) call into the BPF scheduler
  • What is a runqueue
  • What is a DSQ
    • FIFO DSQ vs vtime DSQ
    • Local vs Global vs User DSQs
  • CPU masks
  • Task weight
  • cGroup scheduling

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