[$] Improving performance with SCHED_EXT and IOCost

At SCALE
this year Dan Schatzberg and Tejun Heo,
both from Meta, gave back-to-back talks about some
of the performance-engineering work that they do there. Schatzberg presented on
the extensible BPF scheduler, which has been
discussed extensively on the kernel mailing list.
Heo presented on IOCost — a control group (cgroup) I/O controller
optimized for solid-state disks (SSDs) — and the benchmark suite that is necessary to
make it work well on different models of disk.