Messages in this thread |  | | | Date | Fri, 21 May 2010 15:38:16 +0530 | | From | Ankita Garg <> | | Subject | Re: [RFC, 3/7] NUMA hotplug emulator |
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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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