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    SubjectRe: [ckrm-tech] [PATCH 3/6] containers: Add generic multi-subsystem API to containers
    Paul Menage wrote:
    > +/* The set of hierarchies in use. Hierarchy 0 is the "dummy
    > + * container", reserved for the subsystems that are otherwise
    > + * unattached - it never has more than a single container, and all
    > + * tasks are part of that container. */
    > +
    > +static struct containerfs_root rootnode[CONFIG_MAX_CONTAINER_HIERARCHIES];
    > +
    > +/* dummytop is a shorthand for the dummy hierarchy's top container */
    > +#define dummytop (&rootnode[0].top_container)
    > +

    With these changes, is there a generic way to determine the root container
    for the hierarchy the subsystem is in? Calls to ->create() pass the dummytop
    container. It would be useful and is often required to walk the hierarchy
    and know the root of the container hierarchy.

    --
    Thanks,
    Balbir Singh,
    Linux Technology Center,
    IBM Software Labs
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