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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