Fstrim

fstrim discard unused blocks on a mounted filesystem

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Aug 10 03:31:41 SERVER fstrim[952]: /: 3.3 GiB (3557924864 bytes) trimmed

See also

• SSD, Intel Optane, NAND, V-NAND or 3D V-NAND, NVMe, NVM
• File systems: mount, umount, findmnt, find, swapon, swapoff, UUID, blkid, mount options: /etc/fstab, udisksctl mount, guestmount, /proc/mounts, fstrim, systemd-mount, defaults

http://man7.org/linux/man-pages/man8/fstrim.8.html