The Linux Plumbers Conference blog has a
report from the sched_ext microconference held in Prague.

Three main topics dominated the discussions

Priority inversion and how to handle it in sched_ext: lock holder and
  	     lock waiter preemption, time slice extension, and making proxy execution
  	     work together with BPF schedulers.
         Paravirtualized scheduling: letting the host and guest schedulers
  	     cooperate across the VM boundary, with sched_ext as the policy engine on
  	     the host.
         Device and topology-aware scheduling: using hardware feedback (Intel
  	     HFI), device/accelerator locality and cache topology to drive task
  	     placement.

https://lwn.net/Articles/1103426/
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