On 04/11/20 11:52, Li, Aubrey wrote: > On 2020/11/4 3:27, Valentin Schneider wrote: >>> +static DEFINE_PER_CPU(bool, cpu_idle_state); >> >> I would've expected this to be far less compact than a cpumask, but that's >> not the story readelf is telling me. Objdump tells me this is recouping >> some of the padding in .data..percpu, at least with the arm64 defconfig. >> >> In any case this ought to be better wrt cacheline bouncing, which I suppose >> is what we ultimately want here. > > Yes, every CPU has a byte, so it may not be less than a cpumask. Probably I > can > put it into struct rq, do you have any better suggestions? >
Not really, I'm afraid.
