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Commit 0c8fc2c1 authored by Li Zefan's avatar Li Zefan Committed by Tejun Heo
Browse files

cgroup: remove bogus comments 



We never grab cgroup mutex in fork and exit paths no matter whether
notify_on_release is set or not.

Signed-off-by: default avatarZefan Li <lizefan@huawei.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 244bb9a6

kernel/cgroup.c

+0 −8
Original line number Diff line number Diff line
@@ -967,14 +967,6 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task, 
 * knows that the cgroup won't be removed, as cgroup_rmdir()

 * needs that mutex.

 *

 * The fork and exit callbacks cgroup_fork() and cgroup_exit(), don't

 * (usually) take cgroup_mutex.  These are the two most performance

 * critical pieces of code here.  The exception occurs on cgroup_exit(),

 * when a task in a notify_on_release cgroup exits.  Then cgroup_mutex

 * is taken, and if the cgroup count is zero, a usermode call made

 * to the release agent with the name of the cgroup (path relative to

 * the root of cgroup file system) as the argument.

 *

 * A cgroup can only be deleted if both its 'count' of using tasks

 * is zero, and its list of 'children' cgroups is empty.  Since all

 * tasks in the system use _some_ cgroup, and since there is always at