Re: Inquiry: Should we remove "isolcpus= kernel boot option? (may have realtime uses)

[Andi Kleen]

> We (SGI) routinely handle that need with a custom init program,
> 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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