i've noticed swap is not being used on my armbian system (in this case, it is a Banana Pi R1). I tried to dig deeper and spent several hours looking into a cause and cannot find any way to resolve.
I updated everything yesterday to ensure there was no issue with a known bug in a previous package.
$ uname -a
Linux raspberrypi 4.9.7-sunxi #1 SMP Thu Feb 2 01:52:06 CET 2017 armv7l GNU/Linux
I have my swap located on a 2.5" HD that is attached. It is on the /u01 mounted partition as a swap file. I tried creating a second just to eliminate that is a file issue (using mkswap) and trying to activate it. Both files will activate and show in use, but % swap always remains 0.
$ ls -l /u01/swap*
-rw------- 1 root root 1048576000 Apr 13 2016 /u01/swap
-rw-r--r-- 1 root root 1073741824 Feb 19 11:11 /u01/swap2
$ free
total used free shared buffers cached
Mem: 1022748 1000784 21964 20600 12948 802580
-/+ buffers/cache: 185256 837492
Swap: 1023996 0 1023996
# cat /proc/sys/vm/swappiness
60
sysctl -n vm.swappiness
60
# swapon
NAME TYPE SIZE USED PRIO
/u01/swap file 1000M 0B -1
Yesterday I was getting processes killed because of out of memory. The system refuses to use the swap.
