cgroups: document the effect of attaching PID 0 to a cgroup

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>
Cc: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zefan 2008-07-04 09:59:55 -07:00 committed by Linus Torvalds
parent 4e0d13cbb7
commit bef67c5a7d

View File

@ -390,6 +390,10 @@ If you have several tasks to attach, you have to do it one after another:
...
# /bin/echo PIDn > tasks
You can attach the current shell task by echoing 0:
# echo 0 > tasks
3. Kernel API
=============