Re: [patch] sched: get rid of p->children use in show_task()

* Ingo Molnar <[email protected]> wrote:

> > > 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.
> > 
> > And what pray tell except for heuristics is the list of children 
> > used for?
> 
> yeah - by all means get rid of it, but first separate the data 
> structures along uses. Then all the 'why should we iterate two lists 
> in sequence' questions vanish.

and this way we get the best change as well: not only will kthreads be 
removed from that list, but all other tasks in the system too. I bet 
this will speed up wait4() _enormously_, on server workloads that 
involve many tasks.

	Ingo
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---

• References:
  • Re: init's children list is long and slows reaping children.
    • From: Robin Holt <[email protected]>
  • Re: init's children list is long and slows reaping children.
    • From: [email protected] (Eric W. Biederman)
  • Re: init's children list is long and slows reaping children.
    • From: Oleg Nesterov <[email protected]>
  • Re: init's children list is long and slows reaping children.
    • From: Ingo Molnar <[email protected]>
  • Re: init's children list is long and slows reaping children.
    • From: [email protected] (Eric W. Biederman)
  • [patch] sched: get rid of p->children use in show_task()
    • From: Ingo Molnar <[email protected]>

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