root@ubuntu:~# date; smem -tkw
Wed Oct 30 00:39:52 UTC 2019
kernel dynamic memory        753.4M     657.0M      96.3M

root@ubuntu:~# date; smem -tkw
Wed Oct 30 17:58:55 UTC 2019
kernel dynamic memory          2.5G       2.3G     187.5M

root@ubuntu:~# uname -r
5.3.0-18-generic

root@ubuntu:~# tail -n1 /etc/lsb-release
DISTRIB_DESCRIPTION="Ubuntu 19.10"