Messages in this thread | | | Date | Wed, 21 Mar 2018 10:08:26 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/5] x86/smpboot: Add the missing description of possible_cpus |
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On Wed, Mar 21, 2018 at 01:33:24PM +0800, Dou Liyang wrote: > How about: > > possible_cpus= [s390,x86_64] Set the number of possible CPUs which > are determined by the ACPI tables MADT or mptables by > default. possible_cpus=n : n >= 1 enforces the possible > number to be 'n'. > While nr_cpus is also be set: nr_cpus=m, choice the > minimum one for the number of possible CPUs.
So what is the exact difference between possible_cpus and nr_cpus ? I konw maxcpus= limits the number of CPUs we bring up, and possible_cpus limits the possible_map, but I'm not entirely sure what nr_cpus does here.
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