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    Subject[PATCH 0/6] CGroups: cgroup memberlist enhancement+fix
    Date
    (This patch series contains revisions of the patches from
    http://lkml.org/lkml/2009/7/10/396 and a few more.)

    The following series adds a "cgroup.procs" file to each cgroup that reports
    unique tgids rather than pids, which can also be written to for moving all
    threads in a threadgroup at once.

    Patch #5 introduces a new rwsem that must be taken for reading in the fork()
    path, and patch #6 reveals potential for a race when forking in certain
    subsystems before the subsystem's attach() function is called, the naive
    solution to which would be holding on to the fork rwsem until after the attach
    loop. Suggestions for alternative approaches or tweaks to the current approach
    are welcome; one potential fix is to make the fork rwsem per-threadgroup,
    which will involve adding a field to task_struct, thereby drastically reducing
    contention when a write to the procs file is in progress.

    This patch series was written at the same time as Li Zefan's pid namespace
    bugfix patch (from http://lkml.org/lkml/2009/7/1/559 ), and contains a similar
    but finer-grained fix for the same bug. These patches can either be rewritten
    to be applied on top of Li's patch, or be applied as they are with Li's patch
    reversed.

    ---

    Ben Blum (6):
    Lets ss->can_attach and ss->attach do whole threadgroups at a time
    Makes procs file writable to move all threads by tgid at once
    Changes css_set freeing mechanism to be under RCU
    Quick vmalloc vs kmalloc fix to the case where array size is too large
    Ensures correct concurrent opening/reading of pidlists across pid namespaces
    Adds a read-only "procs" file similar to "tasks" that shows only unique tgids


    Documentation/cgroups/cgroups.txt | 12 -
    include/linux/cgroup.h | 58 ++-
    kernel/cgroup.c | 816 ++++++++++++++++++++++++++++++-------
    kernel/cgroup_freezer.c | 15 +
    kernel/cpuset.c | 65 ++-
    kernel/fork.c | 2
    kernel/ns_cgroup.c | 16 +
    kernel/sched.c | 37 ++
    mm/memcontrol.c | 3
    security/device_cgroup.c | 3
    10 files changed, 843 insertions(+), 184 deletions(-)



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