Re: HOTPLUG CPU Support for SMT

[Zwane Mwaikambo]

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/