Re: [PATCH] cleanup ptrace stops and remove notify_parent

[Roland McGrath]

> For TASK_DEAD and TASK_TRACED, might you be hiding some underlying state?

Not really.

> I want to display stuff like:
> 
> T    stopped (not traced)
> TX   stopped, and being traced
> RX   running or runnable, and being traced
> ZE   zombie, and trying to exit
> RXE  running, trying to exit, and traced

These distinctions don't exist in any data structures, except for the
PF_EXITING flag.  

> It's troubling the way TASK_DEAD and TASK_TRACED show up as
> actual states and hide any other stuff. I'd much prefer them
> to be flags of some sort.

That's a different implementation than what we've got now.  Feel free to
try to make it work.  Linus has talked before about treating the state as a
bitmask, but the code is not actually written that way now.  
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