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