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SubjectRe: [RFC, 3/7] NUMA hotplug emulator
Hi,

On Thu, May 13, 2010 at 07:48:35PM +0800, Shaohui Zheng wrote:
> Userland interface to hotplug-add fake offlined nodes.
>
> Add a sysfs entry "probe" under /sys/devices/system/node/:
>
> - to show all fake offlined nodes:
> $ cat /sys/devices/system/node/probe
>
> - to hotadd a fake offlined node, e.g. nodeid is N:
> $ echo N > /sys/devices/system/node/probe
>
> Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
> Signed-off-by: Shaohui Zheng <shaohui.zheng@intel.com>
> ---
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 9458685..2c078c8 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1214,6 +1214,20 @@ config NUMA_EMU
> into virtual nodes when booted with "numa=fake=N", where N is the
> number of nodes. This is only useful for debugging.
>
> +config NUMA_HOTPLUG_EMU
> + bool "NUMA hotplug emulator"
> + depends on X86_64 && NUMA && HOTPLUG
> + ---help---
> +
> +config NODE_HOTPLUG_EMU
> + bool "Node hotplug emulation"
> + depends on NUMA_HOTPLUG_EMU && MEMORY_HOTPLUG
> + ---help---
> + Enable Node hotplug emulation. The machine will be setup with
> + hidden virtual nodes when booted with "numa=hide=N*size", where
> + N is the number of hidden nodes, size is the memory size per
> + hidden node. This is only useful for debugging.
> +

The above dependencies do not work as expected. I could configure
NUMA_HOTPLUG_EMU & NODE_HOTPLUG_EMU without having MEMORY_HOTPLUG
turned on. By pushing the above definition below SPARSEMEM and memory
hot add and remove, the dependencies could be sorted out.

--
Regards,
Ankita Garg (ankita@in.ibm.com)
Linux Technology Center
IBM India Systems & Technology Labs,
Bangalore, India


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