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SubjectRe: [PATCH v2 14/14] Change CPUACCT to default n
> despite it being a not entirely natural fit.  Something I proposed at
> Prague and that we could explore here is the idea of a co-mounted
> controller. In this example it would only be mountable with cpu so
> you could always depend on the cpu hierarchy being there; likewise we
> can put (jump-labeled) touchpoints within the cpu-subsystem to call
> out for updates as appropriate when the co-mount exists.

IIUC, this co-mounting idea is something I implemented years ago:

The use case and the reason it was rejected:

Li Zefan

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