[$] The extensible scheduler class

It was only a matter of time before somebody tried to bring BPF to thekernel's CPU scheduler. At the end of January, Tejun Heo posted the secondrevision of a 30-part patch series, co-written with David Vernet, JoshDon, and Barret Rhoden, that does just that. There are clearly interestingthings that could be done by deferring scheduling decisions to a BPFprogram, but it may take some work to sell this idea to the developmentcommunity as a whole.