From: Li Zefan <lizefan@huawei.com>
Date: Sun, 9 Jun 2013 09:16:29 +0000 (+0800)
Subject: cpuset: allow to keep tasks in empty cpusets
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~43^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5c5cc62321d9df7a9a608346fc649c4528380c8f;p=pandora-kernel.git

cpuset: allow to keep tasks in empty cpusets

To achieve this:

- We call update_tasks_cpumask/nodemask() for empty cpusets when
hotplug happens, instead of moving tasks out of them.

- When a cpuset's masks are changed by writing cpuset.cpus/mems,
we also update tasks in child cpusets which are empty.

v3:
- do propagation work in one place for both hotplug and unplug

v2:
- drop rcu_read_lock before calling update_task_nodemask() and
  update_task_cpumask(), instead of using workqueue.
- add documentation in include/linux/cgroup.h

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