One of my earlier patches guarantees that kthreadd will have pid == 2.
daemonize actually explicitly reparents to init so using daemonize and
kernel_thread provides no help at all with respect to scaling. It in
fact guarantees you will be on init's list of child processes.
The work to enhance wait is a little tricky and it conflicts with the
utrace patches, which makes it hard to pursue at the moment.
I'm actually sorting out kthread stop so I can complete the pid namespace.
But since all kthreads are children of kthreadd this helps in a small
way with the scaling issue.
Eric
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