memory unplug v4 intro [0/6]

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Hi,

This is memory unplug base patcheset v4 against 2.6.22-rc4-mm2.
for review and for testers.

Changelog V3 -> V4
- rebased to 2.6.22-rc4-mm2
- cleaned up. it seems simpler than previous ones.
- instread of adding refcnt to anon_vma, using dummy_vma.
- page scan logic is a bit changed.
- order of patches is changed.

We tested this patch on ia64/NUMA.

=
How to use
 - user kernelcore=XXX boot option to create ZONE_MOVABLE.
   Memory unplug itself can work without ZONE_MOVABLE but it will be
   better to use kernelcore= if your section size is big.
  
 - After bootup, execute following.
     # echo "offline" > /sys/devices/system/memory/memoryX/state
 - you can push back offlined memory by following
     # echo "online" > /sys/devices/system/memory/memoryX/state
    
TODO
 - remove memmap after memory unplug. (for sparsemem)
 - more tests and find - page which cannot be freed -
 - Now, there is no check around ZONE_MOVABLE and bootmem.
   I hope bootmem can treat kernelcore=....
 - add better logic to allocate memory for migration.
 - speed up under heavy workload.
 - node hotplug support
 - Should make i386/x86-64/powerpc interface code. But not yet 

Thanks,
-Kame



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