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    Subject[PATCH 00/10] Task Containers(V11): Introduction
    This is an update to the task containers patchset.

    Changes since V10 (May 30th) include:

    - Based on 2.6.22-rc6-mm1 (minus existing container patches, see below)

    - Rolled in various fix/tidy patches contributed by akpm and others

    - Reorganisation of the mount/unmount code to use sget(); the new
    approach is modelled on the NFS superblock code. This fixes some
    potential lock inversions pointed out by lockdep.

    - Fix various lockdep warnings

    - Changed the create() subsystem callback to return a pointer to the
    new state object rather than updating the subsystem pointer in the
    container directly.

    - Changed container_add_file() to automatically prefix the subsystem
    name (and a period) on to all container files unless the filesystem
    is mounted with the "noprefix" option (intended for use by the
    legacy cpuset filesystem emulation).

    - Added a release_agent= mount option to allow the release agent path
    to be specified at mount time.

    - css_put() is now completely non-blocking

    - css_get()/css_put() avoid taking/dropping reference counts on the
    root state since this can't be freed anyway; this saves some atomic ops

    API changes (for subsystem writers):
    1) return your new css object from create() callback
    2) remove the subsystem name prefix from your cftype structures
    3) pass your subsystem pointer as an additional new parameter to
    container_add_file() and container_add_files()

    Still TODO:

    - finalize the naming

    - add a hash-table based lookup for css_group objects.

    - use seq_file properly in container tasks files to avoid having to
    allocate a big array for all the container's task pointers.

    - add virtualization support to allow delegation to virtual servers

    - fix a lockdep false-positive - container_mutex nests inside
    inode->i_mutex, but there's a point in the mount code where we need to
    lock a newly-created (and hence guaranteed unlocked) directory from
    within container_mutex.

    - more subsystems

    Generic Process Containers
    --------------------------

    There have recently been various proposals floating around for
    resource management/accounting and other task grouping subsystems in
    the kernel, including ResGroups, User BeanCounters, NSProxy
    containers, and others. These all need the basic abstraction of being
    able to group together multiple processes in an aggregate, in order to
    track/limit the resources permitted to those processes, or control
    other behaviour of the processes, and all implement this grouping in
    different ways.

    This patchset provides a framework for tracking and grouping processes
    into arbitrary "containers" and assigning arbitrary state to those
    groupings, in order to control the behaviour of the container as an
    aggregate.

    The intention is that the various resource management and
    virtualization/container efforts can also become task container
    clients, with the result that:

    - the userspace APIs are (somewhat) normalised

    - it's easier to test e.g. the ResGroups CPU controller in
    conjunction with the BeanCounters memory controller, or use either of
    them as the resource-control portion of a virtual server system.

    - the additional kernel footprint of any of the competing resource
    management systems is substantially reduced, since it doesn't need
    to provide process grouping/containment, hence improving their
    chances of getting into the kernel


    The patch set is structured as follows:

    1) Basic container framework - filesystem and tracking structures

    2) Support for the "tasks" control file

    3) Hooks for fork() and exit()

    4) Support for the container_clone() operation

    5) Add /proc reporting interface

    6) Share container subsystem pointer arrays between tasks with the
    same assignments

    7) Support for a userspace "release agent", similar to the cpusets
    release agent functionality

    8) Make cpusets a container subsystem

    9) Simple CPU Accounting example subsystem

    10) Simple container debugging subsystem

    It applies to 2.6.22-rc6-mm1, *minus* the following patches (available
    from http://www.kernel.org/pub/linux/kernel/people/akpm/mm/broken-out-2007-06-27-03-28.tar.gz)

    containersv10-basic-container-framework.patch
    containersv10-basic-container-framework-fix.patch
    containersv10-basic-container-framework-fix-2.patch
    containersv10-basic-container-framework-fix-3.patch
    containersv10-example-cpu-accounting-subsystem.patch
    containersv10-example-cpu-accounting-subsystem-fix.patch
    containersv10-add-tasks-file-interface.patch
    containersv10-add-tasks-file-interface-fix.patch
    containersv10-add-tasks-file-interface-fix-2.patch
    containersv10-add-fork-exit-hooks.patch
    containersv10-add-fork-exit-hooks-fix.patch
    containersv10-add-container_clone-interface.patch
    containersv10-add-container_clone-interface-fix.patch
    containersv10-add-procfs-interface.patch
    containersv10-add-procfs-interface-fix.patch
    containersv10-make-cpusets-a-client-of-containers.patch
    containersv10-make-cpusets-a-client-of-containers-whitespace.patch
    containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships.patch
    containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-fix.patch
    containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-cpuset-zero-malloc-fix-for-new-containers.patch
    containersv10-simple-debug-info-subsystem.patch
    containersv10-simple-debug-info-subsystem-fix.patch
    containersv10-simple-debug-info-subsystem-fix-2.patch
    containersv10-support-for-automatic-userspace-release-agents.patch
    containersv10-support-for-automatic-userspace-release-agents-whitespace.patch
    add-containerstats-v3.patch
    add-containerstats-v3-fix.patch
    update-getdelays-to-become-containerstats-aware.patch
    containers-implement-subsys-post_clone.patch
    containers-implement-namespace-tracking-subsystem-v3.patch


    Signed-off-by: Paul Menage <menage@google.com>

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