Hi Minchan,
[auto build test WARNING on next-20160318]
[cannot apply to v4.5-rc7 v4.5-rc6 v4.5-rc5 v4.5]
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This patch enables tail page migration of zspage.
In this point, I tested zsmalloc regression with micro-benchmark
which does zs_malloc/map/unmap/zs_free for all size class
in every CPU(my system is 12) during 20 sec.
It shows 1% regression which is really small when we consider
the benefit of