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Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)
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From:
Andi Kleen <andi@...>
To: Paul Jackson <pj@...>
Cc: Andi Kleen <andi@...>, <maxk@...>, <ioe-lkml@...>, <sivanich@...>, <a.p.zijlstra@...>, <linux-kernel@...>, <kernel@...>, <dfults@...>, <devik@...>, <dino@...>, <emmanuel.pacaud@...>, <deweerdt@...>, <mingo@...>, <colpatch@...>, <nickpiggin@...>, <rostedt@...>, <oleg@...>, <paulmck@...>, <menage@...>, <rddunlap@...>, <suresh.b.siddha@...>, <tglx@...>
Subject:
Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)
Date: Wednesday, June 4, 2008 - 4:03 pm
> We (SGI) routinely handle that need with a custom init program,
quoted text
> invoked with the init= parameter to the booting kernel, which > sets up cpusets and then invokes the normal (real) init program > in a cpuset configured to exclude those CPUs and nodes which we > want to remain unloaded. For example, on a 256 CPU, 64 node > system, we might have init running on a single node of 4 CPUs, > and leave the remaining 63 nodes and 252 CPUs isolated from all > the usual user level daemons started by init. > > There is no need for additional kernel changes to accomplish this.
There are no additional changes needed, but you must admit that isolcpus is a much more elegant solutation for this problem than hijacking init. -Andi --
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Messages in current thread:
Inquiry: Should we remove "isolcpus= kernel boot option? (ma...
, Paul Jackson
, (Sun Jun 1, 10:30 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Ingo Oeser
, (Mon Jun 2, 6:35 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Peter Zijlstra
, (Mon Jun 2, 6:45 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Nick Piggin
, (Tue Jun 3, 2:03 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Mark Hounschell
, (Wed Jun 4, 5:58 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 3:26 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Peter Zijlstra
, (Wed Jun 4, 4:25 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Mark Hounschell
, (Thu Jun 5, 7:44 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyanskiy
, (Fri Jun 6, 6:28 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Michael Trimarchi
, (Wed Jun 4, 5:44 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Peter Zijlstra
, (Wed Jun 4, 5:52 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Michael Trimarchi
, (Thu Jun 5, 7:16 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Peter Zijlstra
, (Thu Jun 5, 8:07 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Michael Trimarchi
, (Thu Jun 5, 10:57 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 1:26 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Mark Hounschell
, (Wed Jun 4, 5:00 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 5:03 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Mon Jun 2, 7:04 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Ingo Oeser
, (Mon Jun 2, 7:55 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Mon Jun 2, 11:32 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyanskiy
, (Tue Jun 3, 7:47 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Ingo Oeser
, (Wed Jun 4, 12:18 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 1:47 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Nick Piggin
, (Tue Jun 3, 9:18 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Tue Jun 3, 11:00 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Tue Jun 3, 8:41 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 12:32 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Andi Kleen
, (Wed Jun 4, 8:18 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 1:41 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Andi Kleen
, (Wed Jun 4, 4:03 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 4:16 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Andi Kleen
, (Wed Jun 4, 4:33 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 4:38 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 5:16 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 5:17 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 5:20 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 5:26 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 2:29 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Andi Kleen
, (Wed Jun 4, 4:05 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 4:23 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 2:58 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 3:31 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 3:37 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 3:45 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Peter Zijlstra
, (Wed Jun 4, 2:56 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Wed Jun 4, 3:34 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Paul Jackson
, (Wed Jun 4, 12:47 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Dimitri Sivanich
, (Mon Jun 2, 12:42 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Mon Jun 2, 2:39 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Dimitri Sivanich
, (Mon Jun 2, 5:41 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyansky
, (Mon Jun 2, 5:59 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Dimitri Sivanich
, (Tue Jun 3, 10:40 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Dimitri Sivanich
, (Wed Jun 4, 10:00 am)
Stop machine threads are getting preemted by the rt period e...
, Max Krasnyansky
, (Wed Jun 4, 2:07 pm)
Re: Stop machine threads are getting preemted by the rt peri...
, Peter Zijlstra
, (Wed Jun 4, 2:18 pm)
Re: Stop machine threads are getting preemted by the rt peri...
, Max Krasnyansky
, (Wed Jun 4, 2:24 pm)
Re: Stop machine threads are getting preemted by the rt peri...
, Peter Zijlstra
, (Wed Jun 4, 2:55 pm)
Re: Stop machine threads are getting preemted by the rt peri...
, Max Krasnyansky
, (Wed Jun 4, 4:14 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot option?...
, Max Krasnyanskiy
, (Tue Jun 3, 1:57 pm)
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