Messages in this thread | | | Date | Mon, 08 Apr 2013 09:11:06 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] Do not force shutdown/reboot to boot cpu. |
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On 04/08/2013 08:57 AM, Ingo Molnar wrote: > > I think the original commit: > > f96972f2dc63 kernel/sys.c: call disable_nonboot_cpus() in kernel_restart() > > actually regressed your 1024 CPU systems, and should possibly be reverted or fixed > in some other fashion - such as by migrating to the primary CPU (on architectures > that require that), instead of hotplug offlining every secondary CPU on every > architecture! > > Alternatively, disable_nonboot_cpus() could perhaps be improved to down CPUs in > parallel: issue the CPU-down requests to every CPU, then wait for them to complete > - instead of the loop over every CPU? > > This would be the conceptual counter part to parallel boot up of CPUs - something > SGI might be interested in as well? >
Migrating to the boot processor and then calling stop_machine() to defang any other processors should be sufficient, no?
I don't know if there is any reason to deschedule all tasks?
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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