On 04/06, Eric W. Biederman 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...
> I'd like to place the list head for the zombie
> list in the signal_struct and not in the task_struct so our
> performance continues to be O(1) when we have a threaded process.
Sure. It would be nice to move ->children into signal_struct at first.
Except this change breaks (in fact fixes) ->pdeath_signal behaviour.
> The big benefit of the zombie list over your proposed list reordering
> is that waitpid can return immediately when we don't have zombies to
> wait for, but we have lots of children.
TASK_TRACED/TASK_STOPPED ?
Oleg.
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