kswapd0 high cpu

kswapd0 high cpu load.
System doesn't have swap partition / swap file.

Using AWS t2.nano

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-34-generic 4.2.0-34.39
ProcVersionSignature: User Name 4.2.0-34.39-generic 4.2.8-ckt4
Uname: Linux 4.2.0-34-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Mar 20 07:35 seq
 crw-rw---- 1 root audio 116, 33 Mar 20 07:35 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Sun Mar 20 07:57:52 2016
Ec2AMI: ami-b7443fc0
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: eu-west-1a
Ec2InstanceType: t2.nano
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
MachineType: Xen HVM domU
PciMultimedia:

ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 cirrusdrmfb
 1 xen
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-34-generic root=UUID=b079c5f1-8fc8-4bb0-aa26-31610f9c5615 ro console=tty1 console=ttyS0
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-34-generic N/A
 linux-backports-modules-4.2.0-34-generic N/A
 linux-firmware 1.149.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2015-11-13 (127 days ago)
dmi.bios.date: 12/07/2015
dmi.bios.vendor: Xen
dmi.bios.version: 4.2.amazon
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd12/07/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 4.2.amazon
dmi.sys.vendor: Xen