Change THP policy from 'madvise' to 'always' since we've found it
benefits a lot in most scenarios, e.g. pmbench.
For defrag configuration, it will be initialized to 'madvise'.
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>