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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:

    https://lkml.org/lkml/2008/6/18/389

    The use case and the reason it was rejected:

    https://lkml.org/lkml/2008/7/1/97

    --
    Li Zefan


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