➜  ~  lsblk
NAME           MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda              8:0    0   113G  0 disk
├─sda1           8:1    0   200M  0 part  /boot/efi
├─sda2           8:2    0  88.8G  0 part
├─sda3           8:3    0   620M  0 part
├─sda4           8:4    0   976M  0 part  /boot
├─sda5           8:5    0   3.8G  0 part
│ └─sda5_crypt 252:1    0   3.8G  0 crypt [SWAP]
└─sda6           8:6    0  18.6G  0 part
  └─sda6_crypt 252:0    0  18.6G  0 crypt /
sdb              8:16   1 120.3G  0 disk

➜  ~  dmsetup ls
sda5_crypt	(252:1)
sda6_crypt	(252:0)

➜  ~  cat /proc/swaps
Filename				Type		Size	Used	Priority
/dev/dm-1                               partition	3987448	0	-1