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SubjectRe: [PATCH sched-devel 0/7] CPU isolation extensions
Hi Max,

> [ ... ]
> Last patch to the stop machine is potentially unsafe and is marked as experimental. Unfortunately
> it's currently the only option that allows dynamic module insertion/removal for above scenarios.

I'm puzzled by the following part (can be a misunderstanding from my side)

+config CPUISOL_STOPMACHINE
+ bool "Do not halt isolated CPUs with Stop Machine (EXPERIMENTAL)"
+ depends on CPUISOL && STOP_MACHINE && EXPERIMENTAL
+ help
+ If this option is enabled kernel will not halt isolated CPUs
+ when Stop Machine is triggered. Stop Machine is currently only
+ used by the module insertion and removal.

this "only" part. What about e.g. a 'cpu hotplug' case (_cpu_down())?
(or we should abstract it a bit to the point that e.g. a cpu can be
considered as 'a module'? :-)


--
Best regards,
Dmitry Adamushko


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