Hi, this is updated version of patch set implementing per-zone on memory cgroup.

I still uses x86_64/fake NUMA (my ia64/NUMA box is under maintainance....)
So, RFC again. (I'd like to do 3rd update in the next week.)

Major Changes from previous one.
 - per-zone-lru_lock patch is added.
 - all per-zone objects of memory cgroup are treated in same way.
 - page migration is handled.
 - restructured and cleaned up.

Todo:
 - do test on "real" NUMA.
 - merge YAMAMOTO-san's background page reclaim patch set on this. (If I can)
 - performance measurement at some point
 - more cleanup and adding meaningful comments
 - confirm added logic in vmscan.c is really sane.

Overview:

All per-zone obects are put into 
==
 struct mem_cgroup_per_zone {
        /*
         * spin_lock to protect the per cgroup LRU
         */
        spinlock_t              lru_lock;
        struct list_head        active_list;
        struct list_head        inactive_list;
        unsigned long count[NR_MEM_CGROUP_ZSTAT];
 };
==
And this per-zone area is accessed by following functions.
==
 mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
 page_cgroup_zoneinfo(struct page_cgroup *pc)
==

Typical usage is following.
==
        mz = page_cgroup_zoneinfo(pc);
        spin_lock_irqsave(&mz->lru_lock, flags);
        __mem_cgroup_add_list(pc);
        spin_unlock_irqrestore(&mz->lru_lock, flags);
==

Thanks,
-Kame

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