Re: init's children list is long and slows reaping children.

[Ingo Molnar]

* Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> > I'd almost prefer to just not add kernel threads to any parent 
> > process list *at*all*.
> 
> Yes sure, I didn't argue with that. However, "->exit_state = -1" does 
> matter, we can't detach process unless we make it auto-reap.

> Off course, we also need to add preparent_to_init() to kthread() and 
> (say) stopmachine(). Or we can create kernel_thread_detached() and 
> modify callers to use it.

this isnt a kernel-thread special case. The right solution IMO is to 
first migrate wait4()'s ->children use over to a new p->exiting_children 
list and then to gradually get rid of all remaining uses of p->children. 
(the first patch of which i sent a few minutes ago)

that way wait4() will be sped up, and quite dramatically i believe. No 
need to deal with kthreads here at all - those just wont ever show up in 
the ->exiting_children list. Am i missing something?

	Ingo
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