[Xen-devel] Ping: [PATCH 0/5] x86: more power-efficient CPU parking

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.08.18 at 16:22,  wrote:
> When putting CPUs to sleep permanently, we should try to put them into
> the most power conserving state possible. For now it is unclear whether,
> especially in a deep C-state, the P-state also matters, so this series only
> arranges for the C-state side of things (plus some cleanup).
> 
> 1: x86/cpuidle: replace a pointless NULL check
> 2: x86/idle: re-arrange dead-idle handling
> 3: x86/cpuidle: push parked CPUs into deeper sleep states when possible
> 4: x86/cpuidle: clean up Cx dumping
> 5: x86: place non-parked CPUs into wait-for-SIPI state after offlining

So patch 5 is understandably controversial, and I'm explicitly
excluding it from the ping. Patch 1 has gone in long ago and
patch 4 has been acked. While there was some feedback on
2 (albeit stalled then after my reply), I don't think I've had any
substantial feedback on 3 though, yet _they_ are supposed to
provide the main improvement here. Patch 5 really was meant
to be more optional than I had expressed, hence its placement
even after the pure cleanup patch 4.

The series has been pending for well over half a year now,
yet other than for the indirect call patching series (where it
already doesn't feel really well) I don't want to propose
simply committing this in the absences of sufficient feedback.

Jan



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