From: Li Zefan <lizf@cn.fujitsu.com>

Document that a pid of zero(0) can be used to refer to the current task
when attaching a task to a cgroup, as in the following usage:

	# echo 0 > /dev/cgroup/tasks

This is consistent with existing cpuset behavior.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Jackson <pj@sgi.com>
Acked-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 Documentation/cgroups.txt |    4 ++++
 1 file changed, 4 insertions(+)

diff -puN Documentation/cgroups.txt~cgroups-document-the-effect-of-attaching-pid-0-to-a-cgroup Documentation/cgroups.txt
--- a/Documentation/cgroups.txt~cgroups-document-the-effect-of-attaching-pid-0-to-a-cgroup
+++ a/Documentation/cgroups.txt
@@ -390,6 +390,10 @@ If you have several tasks to attach, you
 	...
 # /bin/echo PIDn > tasks
 
+You can attach the current task by echoing 0:
+
+# /bin/echo 0 > tasks
+
 3. Kernel API
 =============
 
_