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cgroup: remove bogus comments

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

Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Li Zefan 2014-09-17 18:19:24 +08:00 committed by Tejun Heo
parent 244bb9a633
commit 0c8fc2c121
1 changed files with 0 additions and 8 deletions
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kernel/cgroup.c
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@ -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