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The QoS feature set already has a mechanism to associate >> execution on each logical processor with an RMID or COS. PLZA allows the >> system to override this per-thread association for a thread that is >> executing with CPL=0. > > Adding Drew, and prodding Dave & James, for this discussion. > > At LPC it was stated that both ARM and RISC-V already have support > to run kernel code with different quality of service parameters from > user code. > > I'm thinking that Babu's implementation for resctrl may be over > engineered. Specifically the part that allows users to put some > tasks into the PLZA group, while leaving others in a mode where > kernel code runs with same QoS parameters as user code. > > That comes at a cost of complexity, and performance in the context > switch code. > > But maybe I'm missing some practical case where users want that > behaviour. > > -Tony