cgroup, cpuset: replace move_member_tasks_to_cpuset() with cgroup_transfer_tasks()

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When a cpuset becomes empty (no CPU or memory), its tasks are
transferred with the nearest ancestor with execution resources.  This
is implemented using cgroup_scan_tasks() with a callback which grabs
cgroup_mutex and invokes cgroup_attach_task() on each task.

Both cgroup_mutex and cgroup_attach_task() are scheduled to be
unexported.  Implement cgroup_transfer_tasks() in cgroup proper which
is essentially the same as move_member_tasks_to_cpuset() except that
it takes cgroups instead of cpusets and @to comes before @from like
normal functions with those arguments, and replace
move_member_tasks_to_cpuset() with it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

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This commit is contained in:

Tejun Heo 2013-04-07 09:29:50 -07:00

parent d9c10ddddc

commit 8cc9934520

3 changed files with 35 additions and 45 deletions

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1

include/linux/cgroup.h

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28

kernel/cgroup.c

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51

kernel/cpuset.c

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