On 08/05/20 11:58, Dietmar Eggemann wrote: > On 07/05/2020 23:15, Valentin Schneider wrote: >> >> On 07/05/20 19:05, John Mathew wrote: > > [...] > >> It would also be an opportunity to have one place to (at least briefly) >> describe what the different sched classes do wrt capacity asymmetry - CFS >> does one thing, RT now does one thing (see Qais' work), and DL will >> hopefully soon follow (see Dietmar's work). >> >> I'd be happy to contribute (some of) that, if it can be deemed useful (I >> personally think it might). > > I like the idea. > > Essentially all the code which is guarded by the 'if > (static_branch_unlikely(&sched_asym_cpucapacity)' condition or which > sets it during bring-up. > > * 'Cpu capacity < SCHED_LOAD_SCALE for non-big' CPUs setting during > bringup (necessary dt binding, CPUfreq influence) > > * CFS capacity awareness: > > * wakeup - select_idle_capacity() (replaced wake_cap() & slow path to > cover DynamIQ and classical big.LITTLE) > > * load_balance - misfit handling > > * RT & DL capacity awareness > > * ... & the relation to EAS (Documentation/scheduler/sched-energy.rst) > > This is what we referred to (at least internally) as CAS (Capacity-Aware > Scheduling). Yeah, something like that. I'll sharpen my quill and have a go at it, though it won't be for right now with OSPM and the other ongoing stuff.
