Re: RCU-Task[-Trace] VS EQS (was Re: [PATCH v3 13/25] context_tracking, rcu: Rename rcu_dynticks_task*() into rcu_task*())

[Peter Zijlstra]

On Fri, Aug 02, 2024 at 09:32:08PM -0700, Paul E. McKenney wrote:

> Huh.  One reason for the current smp_call_function_single() in
> cpuhp_report_idle_dead() was some ARM32 CPUs that shut down caching on
> their way out.  this made it impossible to use shared-variable-based
> CPU-dead notification.  I wonder if Arnd's deprecation schedule
> for ARM32-based platforms will allow us to go back to shared-memory
> notification, which might make this sort of thing easier.

All those idle paths should be doing ct_cpuidle_enter(), which includes
telling RCU the CPU is going idle, no?

I cleaned all that up a while back.