After my 10+ hour tests, I got
After my 10+ hour tests, I got

bash-4.2# msctl -p opstats |grep mmap
opstats.mmap-success                           1569887
bash-4.2# msctl -p opstats |grep unmap
opstats.munmap-success                         1569375

This might be too high.  So I adjust the reaper to use the free count
instead of the total count to make reaping decision.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable