Transparent Hugepage support #12

This adds more commentary to khugepaged and it adds two defrag sysfs knobs:

find /sys/ -name defrag
/sys/kernel/mm/transparent_hugepage/defrag
/sys/kernel/mm/transparent_hugepage/khugepaged/defrag

find /sys/ -name defrag -exec cat {} \;
always [madvise] never
[yes] no

This should also fix memcg khugepaged accounting (thanks Kame).

I folded the page_anon_vma patch into transparent_hugepage. It was however good
idea to keep it separated first time around IMHO to make reviewing of the
changes feasible (it's still there to review on the list in the #11 submit if
others wants to review).

Let me know if something else is needed to merge into -mm.

After that we can start to call memory compaction in alloc_hugepage(int defrag)
if defrag == 1.

Thanks!
Andrea

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