[lkml]   [2007]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Subject[PATCH 0/9] Containers (V9): Generic Process Containers

    This is an update to my multi-hierarchy multi-subsystem generic
    process containers patch. Changes since V8 (April 6th) include:

    - The patchset has been rebased over 2.6.21-rc7-mm1

    - The patchset has been restructured based on feedback; more
    functionality is now split out into separate patches where

    - The container_group structure has been renamed css_group since this
    is more descriptive of its true function

    - Added a simplified file registration interface, and a simple
    interface for the common operation of returning a single number to
    userspace from a container control file

    - Added a simple "debug" subsystem that is both an example of how to
    use the container system and a useful debugging tool for checking
    reference counts, etc.

    Still TODO:

    - decide whether "Containers" is an acceptable name for the system
    given its usage by some other development groups, or whether something
    else (ProcessSets? ResourceGroups? TaskGroups?) would be better

    - decide whether merging css_group and nsproxy is desirable

    - 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 back support for the "release agent" functionality

    - lots more testing

    - define standards for container file names

    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.

    Already existing in the kernel is the cpuset subsystem; this has a
    process grouping mechanism that is mature, tested, and well documented
    (particularly with regards to synchronization rules).

    This patchset extracts the process grouping code from cpusets into a
    generic container system, and makes the cpusets code a client of the
    container system, along with a couple of simple example subsystems.

    The patch set is structured as follows:

    1) Basic container framework - filesystem and tracking structures

    2) Simple CPU Accounting example subsystem

    3) Support for the "tasks" control file

    4) Hooks for fork() and exit()

    5) Support for the container_clone() operation

    6) Add /proc reporting interface

    7) Make cpusets a container subsystem

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

    9) Simple container debugging subsystem

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

    - the userspace APIs are (somewhat) normalised

    - it's easier to test out 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

    Signed-off-by: Paul Menage <>
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-04-27 13:17    [W:0.057 / U:42.784 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site