Eric Lee / linux-smarc-t335x-v3.2

31 Mar, 2011

1 commit

23 Feb, 2011

2 commits

18 Jan, 2011

2 commits

07 Jan, 2011

2 commits

  • 0ca087355   sched: Mark autogroup_init() __init ... Browse Code »

    autogroup_init() is only called at boot time.

    Signed-off-by: Yong Zhang
    Cc: Mike Galbraith
    Signed-off-by: Peter Zijlstra
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Yong Zhang
     
  • 07e06b011   sched: Consolidate the name of root_task_group and init_task_group ... Browse Code »

    root_task_group is the leftover of USER_SCHED, now it's always
    same to init_task_group.
    But as Mike suggested, root_task_group is maybe the suitable name
    to keep for a tree.
    So in this patch:
    init_task_group --> root_task_group
    init_task_group_load --> root_task_group_load
    INIT_TASK_GROUP_LOAD --> ROOT_TASK_GROUP_LOAD

    Suggested-by: Mike Galbraith
    Signed-off-by: Yong Zhang
    Signed-off-by: Peter Zijlstra
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Yong Zhang
     

04 Jan, 2011

1 commit

  • 4f8219875   sched, autogroup: Fix potential access to freed memory ... Browse Code »

    Oleg pointed out that the /proc interface kref_get() useage may race with
    the final put during autogroup_move_group(). A signal->autogroup assignment
    may be in flight when the /proc interface dereference, leaving them taking
    a reference to an already dead group.

    Reported-by: Oleg Nesterov
    Signed-off-by: Mike Galbraith
    Signed-off-by: Peter Zijlstra
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Mike Galbraith
     

30 Nov, 2010

1 commit

  • 5091faa44   sched: Add 'autogroup' scheduling feature: automated per session task groups ... Browse Code »

    A recurring complaint from CFS users is that parallel kbuild has
    a negative impact on desktop interactivity. This patch
    implements an idea from Linus, to automatically create task
    groups. Currently, only per session autogroups are implemented,
    but the patch leaves the way open for enhancement.

    Implementation: each task's signal struct contains an inherited
    pointer to a refcounted autogroup struct containing a task group
    pointer, the default for all tasks pointing to the
    init_task_group. When a task calls setsid(), a new task group
    is created, the process is moved into the new task group, and a
    reference to the preveious task group is dropped. Child
    processes inherit this task group thereafter, and increase it's
    refcount. When the last thread of a process exits, the
    process's reference is dropped, such that when the last process
    referencing an autogroup exits, the autogroup is destroyed.

    At runqueue selection time, IFF a task has no cgroup assignment,
    its current autogroup is used.

    Autogroup bandwidth is controllable via setting it's nice level
    through the proc filesystem:

    cat /proc//autogroup

    Displays the task's group and the group's nice level.

    echo > /proc//autogroup

    Sets the task group's shares to the weight of nice task.
    Setting nice level is rate limited for !admin users due to the
    abuse risk of task group locking.

    The feature is enabled from boot by default if
    CONFIG_SCHED_AUTOGROUP=y is selected, but can be disabled via
    the boot option noautogroup, and can also be turned on/off on
    the fly via:

    echo [01] > /proc/sys/kernel/sched_autogroup_enabled

    ... which will automatically move tasks to/from the root task group.

    Signed-off-by: Mike Galbraith
    Acked-by: Linus Torvalds
    Acked-by: Peter Zijlstra
    Cc: Markus Trippelsdorf
    Cc: Mathieu Desnoyers
    Cc: Paul Turner
    Cc: Oleg Nesterov
    [ Removed the task_group_path() debug code, and fixed !EVENTFD build failure. ]
    Signed-off-by: Ingo Molnar
    LKML-Reference:
    Signed-off-by: Ingo Molnar

    Mike Galbraith