without _changes.txt

After swapped out:
cat /proc/pid/smaps:
Anonymous:        197388 kB
AnonHugePages:    194560 kB
Swap:             602616 kB
Fraction:	  98,56

cat /proc/meminfo:
AnonPages:       1658832 kB
AnonHugePages:   1597440 kB
Fraction:	 96,29

After swapped in:
cat /proc/pid/smaps:
Anonymous:        800004 kB
AnonHugePages:    194560 kB
Swap:                  0 kB
Fraction:	 24,31

cat /proc/meminfo:
AnonPages:       2261708 kB
AnonHugePages:   1597440 kB
Fraction:	 70,62

I waited 12 minutes and anonhugepages number was not changed.
cat /proc/pid/smaps:
Anonymous:        800004 kB
AnonHugePages:    194560 kB
Swap:                  0 kB
Fraction:	  24,31

cat /proc/meminfo:
AnonPages:       2265904 kB
AnonHugePages:   1597440 kB
Fraction:	 70,49