Re: HOTPLUG CPU Support for SMT

[Zwane Mwaikambo <zwane@arm.linux.org.uk>]

On Mon, 30 May 2005, jayush luniya wrote:

> I have been looking at the CONFIG_HOTPLUG_CPU option
> in the Linux Kernel. The option works for IA64, PPP64,
> S390 architectures. I am doing my research on SMT
> architecture and want to write a kernel module that
> can dynamically enable/disable SMT, so that I can
> switch between uniprocessor mode and SMT mode. So is
> it possible to use the CONFIG_HOTPLUG_CPU option to
> dynamically enable/disable a logical processor by
> performing a logical removal of the CPU since the
> hardware does not support CPU hotplugging? Also I
> would like to know how efficient such an
> implementation would be? 
> 
> I would really appreciate if anyone could provide me
> suggestions and any specific patches related to this
> work.

Yes, older 2.6-mm kernel (2.6.10-mm) trees have the "toy" i386 hotplug 
cpu implementation which does what you want.
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