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

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

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From: Ingo Molnar

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

Date: Friday, April 6, 2007 - 12:22 pm

* Ingo Molnar <mingo@elte.hu> wrote:

quoted text> > > 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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Messages in current thread:

init's children list is long and slows reaping children., Robin Holt, (Thu Apr 5, 12:51 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Thu Apr 5, 1:57 pm)

Re: init's children list is long and slows reaping children., Chris Snook, (Thu Apr 5, 5:51 pm)

Re: init's children list is long and slows reaping children., Chris Snook, (Thu Apr 5, 6:03 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Thu Apr 5, 6:29 pm)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Thu Apr 5, 7:15 pm)

Re: init's children list is long and slows reaping children., Robin Holt, (Fri Apr 6, 3:43 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 8:38 am)

Re: init's children list is long and slows reaping children., Oleg Nesterov, (Fri Apr 6, 9:31 am)

Re: init's children list is long and slows reaping children., Robin Holt, (Fri Apr 6, 9:41 am)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Fri Apr 6, 10:32 am)

Re: init's children list is long and slows reaping children., Roland Dreier, (Fri Apr 6, 10:39 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 11:02 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 11:04 am)

Re: init's children list is long and slows reaping children., Christoph Hellwig, (Fri Apr 6, 11:05 am)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Fri Apr 6, 11:21 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 11:30 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 11:56 am)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Fri Apr 6, 12:16 pm)

[patch] sched: get rid of p->children use in show_task(), Ingo Molnar, (Fri Apr 6, 12:18 pm)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Fri Apr 6, 12:19 pm)

Re: [patch] sched: get rid of p->children use in show_task(), Ingo Molnar, (Fri Apr 6, 12:22 pm)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Fri Apr 6, 12:39 pm)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Fri Apr 6, 2:29 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Fri Apr 6, 2:51 pm)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Fri Apr 6, 3:31 pm)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Fri Apr 6, 3:38 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Fri Apr 6, 3:46 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Fri Apr 6, 3:51 pm)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Fri Apr 6, 3:59 pm)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Fri Apr 6, 4:37 pm)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Mon Apr 9, 1:28 am)

Re: init's children list is long and slows reaping children., Chris Snook, (Mon Apr 9, 10:37 am)

Re: init's children list is long and slows reaping children., Bill Davidsen, (Mon Apr 9, 11:09 am)

Re: init's children list is long and slows reaping children., Kyle Moffett, (Mon Apr 9, 12:28 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Mon Apr 9, 12:51 pm)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Mon Apr 9, 1:00 pm)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Mon Apr 9, 1:03 pm)

Re: init's children list is long and slows reaping children., Andrew Morton, (Mon Apr 9, 5:23 pm)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Mon Apr 9, 5:48 pm)

Re: init's children list is long and slows reaping children., Andrew Morton, (Mon Apr 9, 6:15 pm)

Re: init's children list is long and slows reaping children., Dave Jones, (Mon Apr 9, 6:59 pm)

Re: init's children list is long and slows reaping children., Andrew Morton, (Mon Apr 9, 7:30 pm)

Re: init's children list is long and slows reaping children., Linus Torvalds, (Mon Apr 9, 7:46 pm)

Re: init's children list is long and slows reaping children., Alexey Dobriyan, (Mon Apr 9, 10:07 pm)

Re: init's children list is long and slows reaping children., Dave Jones, (Mon Apr 9, 10:21 pm)

Re: init's children list is long and slows reaping children., Torsten Kaiser, (Mon Apr 9, 11:09 pm)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Mon Apr 9, 11:53 pm)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 12:05 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 12:07 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 12:08 am)

Re: init's children list is long and slows reaping children., Andrew Morton, (Tue Apr 10, 12:37 am)

Re: init's children list is long and slows reaping children., Russell King, (Tue Apr 10, 12:44 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 1:16 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 1:33 am)

Re: init's children list is long and slows reaping children., Andrew Morton, (Tue Apr 10, 1:41 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 1:48 am)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Tue Apr 10, 1:59 am)

Re: init's children list is long and slows reaping children., Jeff Garzik, (Tue Apr 10, 2:33 am)

Re: init's children list is long and slows reaping children., Robin Holt, (Tue Apr 10, 2:42 am)

Re: init's children list is long and slows reaping children., Oleg Nesterov, (Tue Apr 10, 6:38 am)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Tue Apr 10, 6:48 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Tue Apr 10, 7:51 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Tue Apr 10, 8:00 am)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Tue Apr 10, 8:06 am)

Re: init's children list is long and slows reaping children., Bill Davidsen, (Tue Apr 10, 8:12 am)

[PATCH] Only send pdeath_signal when getppid changes., Eric W. Biederman, (Tue Apr 10, 8:16 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Tue Apr 10, 8:22 am)

Re: init's children list is long and slows reaping children., Ingo Molnar, (Tue Apr 10, 8:53 am)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Tue Apr 10, 9:17 am)

Re: init's children list is long and slows reaping children., Matt Mackall, (Tue Apr 10, 9:35 am)

Re: [PATCH] Only send pdeath_signal when getppid changes., Oleg Nesterov, (Tue Apr 10, 9:37 am)

Re: init's children list is long and slows reaping children., Oleg Nesterov, (Tue Apr 10, 9:44 am)

Re: [PATCH] Only send pdeath_signal when getppid changes., Eric W. Biederman, (Tue Apr 10, 10:41 am)

Re: [PATCH] Only send pdeath_signal when getppid changes., Roland McGrath, (Tue Apr 10, 10:48 am)

Re: init's children list is long and slows reaping children., Davide Libenzi, (Tue Apr 10, 12:17 pm)

Re: init's children list is long and slows reaping children., Ingo Oeser, (Tue Apr 10, 3:20 pm)

Re: init's children list is long and slows reaping children., Ingo Oeser, (Tue Apr 10, 3:35 pm)

Re: [PATCH] Only send pdeath_signal when getppid changes., Albert Cahalan, (Tue Apr 10, 8:17 pm)

[patch] uninline remove/add_parent() APIs, Ingo Molnar, (Tue Apr 10, 11:20 pm)

Re: [patch] uninline remove/add_parent() APIs, Eric W. Biederman, (Wed Apr 11, 12:00 am)

Re: init's children list is long and slows reaping children., Nick Piggin, (Wed Apr 11, 12:28 am)

Re: init's children list is long and slows reaping children., Bill Davidsen, (Wed Apr 11, 12:55 pm)

Re: init's children list is long and slows reaping children., Eric W. Biederman, (Wed Apr 11, 1:17 pm)

Re: init's children list is long and slows reaping children., Oleg Nesterov, (Wed Apr 11, 1:19 pm)

Re: init's children list is long and slows reaping children., Bill Davidsen, (Wed Apr 11, 2:24 pm)

Re: [patch] uninline remove/add_parent() APIs, Andrew Morton, (Wed Apr 11, 3:06 pm)

Re: [patch] uninline remove/add_parent() APIs, Eric W. Biederman, (Thu Apr 12, 3:45 am)

Re: [patch] uninline remove/add_parent() APIs, Roland McGrath, (Thu Apr 12, 3:50 pm)