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authorFrederic Weisbecker <fweisbec@gmail.com>2011-12-23 03:25:23 (GMT)
committerTejun Heo <tj@kernel.org>2011-12-27 17:05:20 (GMT)
commit7e3aa30ac8c904a706518b725c451bb486daaae9 (patch)
tree1a6ad0678271d1cba5eba2fcafcbfa71b4e4c66d /kernel/rcutree_trace.c
parentc6ca57500c23d57a4ccec9874b6a3c99c297e1b5 (diff)
downloadlinux-7e3aa30ac8c904a706518b725c451bb486daaae9.tar.xz
cgroup: Remove task_lock() from cgroup_post_fork()
cgroup_post_fork() is protected between threadgroup_change_begin() and threadgroup_change_end() against concurrent changes of the child's css_set in cgroup_task_migrate(). Also the child can't exit and call cgroup_exit() at this stage, this means it's css_set can't be changed with init_css_set concurrently. For these reasons, we don't need to hold task_lock() on the child because it's css_set can only remain stable in this place. Let's remove the lock there. v2: Update comment to explain that we are safe against cgroup_exit() Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Containers <containers@lists.linux-foundation.org> Cc: Cgroups <cgroups@vger.kernel.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul Menage <paul@paulmenage.org> Cc: Mandeep Singh Baines <msb@chromium.org>
Diffstat (limited to 'kernel/rcutree_trace.c')
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