This is small script that helps using of fstrim utility (http://man7.org/linux/man-pages/man8/fstrim.8.html). According to recommendations - it's better to run fstrim on your system start to utilize using of your SSD. In Ubuntu distros it's putting command fstrim / into your /etc/rc.local.
This method worked Ok, but I want to control results of utility working. fstrim / -v helps, but it's returns results like /: 194633728 bytes were trimmed so very uninformative due to raw bytes count.
This script is putting output of fstrim to the /var/log/trim.log with human-readable size (simple convertation to Mb).
Copy trim.sh to your /usr/bin directory (or any you think better). Rename if it's needed.
Put /usr/bin/trim.sh && into your /etc/rc.local before exit 0 line. (/etc/rc.local used in Ubuntu-like dsitro. In different Linux distro it could be different files).