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authorLi Zefan <lizefan@huawei.com>2014-09-17 18:19:24 +0800
committerTejun Heo <tj@kernel.org>2014-09-18 06:34:16 +0900
commit0c8fc2c1210556434835adfb2274f41704853e8a (patch)
tree72f83f1640aa63246c99e71b1cad4b6338ab97da /kernel/cgroup.c
parent244bb9a6336d2aa53526261ec35c593ebd5c1a33 (diff)
downloadlinux-0c8fc2c1210556434835adfb2274f41704853e8a.tar.bz2
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: Zefan Li <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index d739a732edb9..4ddc75588983 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -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