I just switched to systemd, and was poking around a bit when I noticed many new entries in /etc/mtab: ... securityfs /sys/kernel/security securityfs rw,nosuid,nodev,noexec,relatime 0 0 tmpfs /sys/fs/cgroup tmpfs rw,nosuid,nodev,noexec,mode=755 0 0 cgroup /sys/fs/cgroup/systemd cgroup rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd 0 0 cgroup /sys/fs/cgroup/cpuset cgroup rw,nosuid,nodev,noexec,relatime,cpuset 0 0 cgroup /sys/fs/cgroup/cpu,cpuacct cgroup rw,nosuid,nodev,noexec,relatime,cpuacct,cpu 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,nosuid,nodev,noexec,relatime,devices 0 0 cgroup /sys/fs/cgroup/freezer cgroup rw,nosuid,nodev,noexec,relatime,freezer 0 0 cgroup /sys/fs/cgroup/net_cls cgroup rw,nosuid,nodev,noexec,relatime,net_cls 0 0 cgroup /sys/fs/cgroup/blkio cgroup rw,nosuid,nodev,noexec,relatime,blkio 0 0 systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=21,pgrp=1,timeout=300,minproto=5,maxproto=5,direct 0 0 hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0 debugfs /sys/kernel/debug debugfs rw,relatime 0 0 mqueue /dev/mqueue mqueue rw,relatime 0 0 tmpfs /tmp tmpfs rw 0 0 fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0 In particular, I notice that /dev/hugepages, /dev/mqueue, and /sys/kernel/debug seem to correspond to unit files dev-hugepages.mount, dev-mqueue.mount, and sys-kernel-debug.mount, respectively. As I'm trying to pare down the output of systemctl list-units, I'd like to know if these things can safely be removed. (Nothing has gone wrong, but I'm just curious, and can't seem to find much online about the relevance of these things to systemd.) Many thanks, J.M.