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    Subject[PATCH 0/7] cgroups: Allow to bind/unbind subsystems to/from non-trival hierarchy
    Stephane posted a patchset to add perf_cgroup subsystem, so perf can
    be used to monitor all threads belonging to a cgroup.

    But if you already mounted a cgroup hierarchy but without perf_cgroup
    and the hierarchy has sub-cgroups, you can't bind perf_cgroup to it,
    and thus you're not able to use per-cgroup perf feature.

    This patchset alleviates the pain, and then a subsytem can be
    bound/unbound to/from a hierarchy which has sub-cgroups in it.

    Some subsystems still can't take advantage of this patchset, memcgroup
    and cpuset in specific.

    For cpuset, if a hierarchy has a sub-cgroup and the cgroup has tasks,
    we can't decide sub-cgroup's cpuset.mems and cpuset.cpus automatically
    if we try to bind cpuset to this hierarchy.

    For memcgroup, memcgroup uses css_get/put(), and due to some complexity,
    for now bindable subsystems should not use css_get/put().


    # mount -t cgroup -o cpuset xxx /mnt
    # mkdir /mnt/tmp
    # echo $$ > /mnt/tmp/tasks

    (add cpuacct to the hierarchy)
    # mount -o remount,cpuset,cpuacct xxx /mnt

    (remove it from the hierarchy)
    # mount -o remount,cpuset xxx /mnt

    There's another limitation, cpuacct should not be bound to any mounted
    hierarchy before the above operation. But that's not a problem, as you
    can remove it from a hierarchy and bind it to another one.

    Documentation/cgroups/cgroups.txt | 26 ++-
    include/linux/cgroup.h | 25 +++-
    kernel/cgroup.c | 305 +++++++++++++++++++++++++++++++------
    kernel/cgroup_freezer.c | 19 ++-
    kernel/sched.c | 1 +
    net/sched/cls_cgroup.c | 1 +
    security/device_cgroup.c | 1 +
    7 files changed, 311 insertions(+), 67 deletions(-)

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      Last update: 2010-10-22 10:11    [W:0.019 / U:74.744 seconds]
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