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Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)
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From: Dimitri Sivanich
Subject:
Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)
Date: Wednesday, June 4, 2008 - 7:00 am
On Tue, Jun 03, 2008 at 09:40:10AM -0500, Dimitri Sivanich wrote:
quoted text
> I tried the following scenario on an ia64 Altix running 2.6.26-rc4 with cpusets compiled in but cpuset fs unmounted. Do your patches already address this? > > $ taskset -cp 3 $$ (attach to cpu 3) > pid 4591's current affinity list: 0-3 > pid 4591's new affinity list: 3 > $ echo 0 > /sys/devices/system/cpu/cpu2/online (down cpu 2) > (above command hangs) > > Backtrace of pid 4591 (bash) > > Call Trace: > [<a00000010078e990>] schedule+0x1210/0x13c0 > sp=e0000060b6dffc90 bsp=e0000060b6df11e0 > [<a00000010078ef60>] schedule_timeout+0x40/0x180 > sp=e0000060b6dffce0 bsp=e0000060b6df11b0 > [<a00000010078d3e0>] wait_for_common+0x240/0x3c0 > sp=e0000060b6dffd10 bsp=e0000060b6df1180 > [<a00000010078d760>] wait_for_completion+0x40/0x60 > sp=e0000060b6dffd40 bsp=e0000060b6df1160 > [<a000000100114ee0>] __stop_machine_run+0x120/0x160 > sp=e0000060b6dffd40 bsp=e0000060b6df1120 > [<a000000100765ae0>] _cpu_down+0x2a0/0x600 > sp=e0000060b6dffd80 bsp=e0000060b6df10c8 > [<a000000100765ea0>] cpu_down+0x60/0xa0 > sp=e0000060b6dffe20 bsp=e0000060b6df10a0 > [<a000000100768090>] store_online+0x50/0xe0 > sp=e0000060b6dffe20 bsp=e0000060b6df1070 > [<a0000001004f8800>] sysdev_store+0x60/0xa0 > sp=e0000060b6dffe20 bsp=e0000060b6df1038 > [<a00000010022e370>] sysfs_write_file+0x250/0x300 > sp=e0000060b6dffe20 bsp=e0000060b6df0fe0 > [<a00000010018a750>] vfs_write+0x1b0/0x300 > sp=e0000060b6dffe20 bsp=e0000060b6df0f90 > [<a00000010018b350>] sys_write+0x70/0xe0 > sp=e0000060b6dffe20 bsp=e0000060b6df0f18 > [<a00000010000af80>] ia64_ret_from_syscall+0x0/0x20 > sp=e0000060b6dffe30 bsp=e0000060b6df0f18 > [<a000000000010720>] ia64_ivt+0xffffffff00010720/0x400 > sp=e0000060b6e00000 bsp=e0000060b6df0f18
The following workaround alleviates the symptom and hopefully is a hint as to the solution: echo -1 > /proc/sys/kernel/sched_rt_runtime_us --
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Messages in current thread:
Inquiry: Should we remove "isolcpus= kernel boot option? ( ...
, Paul Jackson
, (Sun Jun 1, 7:30 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Dimitri Sivanich
, (Mon Jun 2, 9:42 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Mon Jun 2, 11:39 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Dimitri Sivanich
, (Mon Jun 2, 2:41 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Mon Jun 2, 2:59 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Ingo Oeser
, (Mon Jun 2, 3:35 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Peter Zijlstra
, (Mon Jun 2, 3:45 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Mon Jun 2, 4:04 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Ingo Oeser
, (Mon Jun 2, 4:55 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Mon Jun 2, 8:32 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Nick Piggin
, (Mon Jun 2, 11:03 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Dimitri Sivanich
, (Tue Jun 3, 7:40 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyanskiy
, (Tue Jun 3, 10:57 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyanskiy
, (Tue Jun 3, 4:47 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Tue Jun 3, 5:41 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Nick Piggin
, (Tue Jun 3, 6:18 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Tue Jun 3, 8:00 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Tue Jun 3, 9:32 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Tue Jun 3, 9:47 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Mark Hounschell
, (Wed Jun 4, 2:58 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Andi Kleen
, (Wed Jun 4, 5:18 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Dimitri Sivanich
, (Wed Jun 4, 7:00 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Ingo Oeser
, (Wed Jun 4, 9:18 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 10:26 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 10:41 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 10:47 am)
Stop machine threads are getting preemted by the rt period ...
, Max Krasnyansky
, (Wed Jun 4, 11:07 am)
Re: Stop machine threads are getting preemted by the rt pe ...
, Peter Zijlstra
, (Wed Jun 4, 11:18 am)
Re: Stop machine threads are getting preemted by the rt pe ...
, Max Krasnyansky
, (Wed Jun 4, 11:24 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 11:29 am)
Re: Stop machine threads are getting preemted by the rt pe ...
, Peter Zijlstra
, (Wed Jun 4, 11:55 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Peter Zijlstra
, (Wed Jun 4, 11:56 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 11:58 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 12:26 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 12:31 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 12:34 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 12:37 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 12:45 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Andi Kleen
, (Wed Jun 4, 1:03 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Andi Kleen
, (Wed Jun 4, 1:05 pm)
Re: Stop machine threads are getting preemted by the rt pe ...
, Max Krasnyansky
, (Wed Jun 4, 1:14 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 1:16 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 1:23 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Peter Zijlstra
, (Wed Jun 4, 1:25 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Andi Kleen
, (Wed Jun 4, 1:33 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 1:38 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Mark Hounschell
, (Wed Jun 4, 2:00 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 2:03 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 2:16 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 2:17 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyansky
, (Wed Jun 4, 2:20 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Paul Jackson
, (Wed Jun 4, 2:26 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Michael Trimarchi
, (Wed Jun 4, 2:44 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Peter Zijlstra
, (Wed Jun 4, 2:52 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Michael Trimarchi
, (Thu Jun 5, 4:16 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Mark Hounschell
, (Thu Jun 5, 4:44 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Peter Zijlstra
, (Thu Jun 5, 5:07 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Michael Trimarchi
, (Thu Jun 5, 7:57 am)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, Max Krasnyanskiy
, (Fri Jun 6, 3:28 pm)
Re: Inquiry: Should we remove "isolcpus= kernel boot optio ...
, GeunSik Lim
, (Thu May 7, 7:48 pm)
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