[$] Evaluating vendor changes to the scheduler

The kernel's CPU scheduler does its best to make the right decisions forjust about any workload; over the years, it has been extended to betterhandle mobile-device scheduling as well. But handset vendors still end upapplying their own patches to the scheduler for the kernels they ship.Shipping out-of-tree code in this way leads to a certain amount ofcriticism from the kernel community but, asVincent Donnefort pointed out in his session at the 2020 Power Management and Schedulingin the Linux Kernel summit (OSPM), those patches are applied for areason. He looked at a set of vendor scheduler patches to see why they arebeing used.