Hello, On Thu, Mar 06, 2025 at 07:18:03PM +0100, Andrea Righi wrote: > To implement this, introduce a new helper kfunc scx_bpf_select_cpu_pref() > that allows to specify a cpumask of preferred CPUs: > > s32 scx_bpf_select_cpu_pref(struct task_struct *p, > const struct cpumask *preferred_cpus, > s32 prev_cpu, u64 wake_flags, u64 flags); > > Moreover, introduce the new idle flag %SCX_PICK_IDLE_IN_PREF that can be > used to enforce selection strictly within the preferred domain. Would something like scx_bpf_select_cpu_and() work which is only allowed pick in the intersection (ie. always SCX_PICK_IDLE_IN_PREF). I'm not sure how much more beneficial a built-in two-level mechanism is especially given that it wouldn't be too uncommon to need multi-level pick - e.g. within l3 then within numa node and so on. Thanks. -- tejun
