Re: [PATCH 1/2] sched/isolation: Merge individual nohz_full features into a common housekeeping flag

[Michal Koutný]

Hello Frederic.

On Sat, Feb 04, 2023 at 12:24:08AM +0100, Frederic Weisbecker <frederic@xxxxxxxxxx> wrote:
> The individual isolation features turned on by nohz_full were initially
> split in order for each of them to be tunable through cpusets. However
> plans have changed in favour of an interface (be it cpusets or sysctl)
> grouping all these features to be turned on/off altogether.
> Then should the need ever arise, the interface can still be expanded
> to handle the individual isolation features.
> 
> Therefore the current isolation split between tick/timer/workqueue/rcu/
> kthreads/misc doesn't make sense anymore.

Why it doesn't make sense? I think it's a useful annotation of
respective operations wrt CPU isolation.

The grouping you did into HK_TYPE_KERNEL_NOISE (or even coarser) should
IMO be done at the place where it'll be exposed into the favored
interface (like it's with nohz_full=).

Thanks,
Michal

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