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    SubjectRe: [RFD] cgroup: about multiple hierarchies
    On Mon, 12.03.12 15:28, Tejun Heo (tj@kernel.org) wrote:

    >
    > Hey,
    >
    > On Mon, Mar 12, 2012 at 11:22:18PM +0100, Peter Zijlstra wrote:
    > > On Mon, 2012-03-12 at 15:10 -0700, Tejun Heo wrote:
    > > >
    > > > * How to map controllers which aren't aware of full hierarchy is still
    > > > an open question but I'm still standing by one active node on any
    > > > root-to-leaf path w/ root group serving as the special rest group.
    > >
    > > What does this mean?
    >
    > Let's say we have a tree like the following.
    >
    > root
    > / | \
    > G1 G2 G3
    > / \
    > G31 G32
    >
    > So, for cgroups which don't support full hierarchy, it'll be viewed as
    > either,
    >
    > root
    > / | \
    > G1 G2 G3
    >
    > or
    >
    > root
    > / | | \
    > G1 G2 G31 G32
    >
    > With root being treated specially, probably as just being a equal
    > group as other groups, I'm not fully determined about that yet.

    Note that at least systemd places all services by default beneath a
    single "super" group (/system/), hence the first suggestion would make
    little sense for us. The second suggestion would be fine however.

    Lennart

    --
    Lennart Poettering - Red Hat, Inc.


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