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

[Ingo Molnar]

* Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> > Thinking about it I do agree with Linus that two lists sounds like 
> > the right solution because it ensures we always have O(1) time when 
> > waiting for a zombie.
> 
> Well. I bet this will be painful, and will uglify the code even more.
> 
> do_wait() has to iterate over 2 lists, __ptrace_unlink() should check 
> ->exit_state, etc...

no. Two _completely separate_ lists.

i.e. a to-be-reaped task will still be on the main list _too_. The main 
list is for all the PID semantics rules. The reap-list is just for 
wait4() processing. The two would be completely separate.

	Ingo
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