Yeah, I'm loosely familiar with sched_ext already. However, it is actually the opposite of scheduler activations. SA means upcalling to user-space when thread

Yeah, I'm loosely familiar with sched_ext already. However, it is actually the opposite of scheduler activations. SA means upcalling to user-space when thread scheduling is required. sched_ext means loading a scheduler (coded in BPF) into the kernel. Not dissimilar goals/purposes but wildly different systems.