rockshooter ~ # mount | grep tmp
none on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
udev on /dev type devtmpfs (rw,nosuid,relatime,size=10240k,nr_inodes=392572,mode=755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
cgroup_root on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,relatime,size=10240k,mode=755)

rockshooter ~ # df -h /run /dev /dev/shm /sys/fs/cgroup
Filesystem      Size  Used Avail Use% Mounted on
none            1.6G  692K  1.6G   1% /run
udev             10M     0   10M   0% /dev
tmpfs           1.6G     0  1.6G   0% /dev/shm
cgroup_root      10M     0   10M   0% /sys/fs/cgroup

rockshooter ~ # free
              total        used        free      shared  buff/cache   available
Mem:        3233500     1849436     1010092         952      373972     1191376
Swap:       4194272       49464     4144808

rockshooter ~ # cat /proc/meminfo
MemTotal:        3233500 kB
MemFree:         1009960 kB
MemAvailable:    1191352 kB
Buffers:               0 kB
Cached:           162916 kB
SwapCached:         6248 kB
Active:           216748 kB
Inactive:         165732 kB
Active(anon):     182172 kB
Inactive(anon):    38348 kB
Active(file):      34576 kB
Inactive(file):   127384 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       4194272 kB
SwapFree:        4144836 kB
Dirty:               748 kB
Writeback:             0 kB
AnonPages:        216572 kB
Mapped:           106036 kB
Shmem:               952 kB
Slab:             210956 kB
SReclaimable:      45964 kB
SUnreclaim:       164992 kB
KernelStack:        4112 kB
PageTables:         6120 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     5811020 kB
Committed_AS:     900712 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
DirectMap4k:       12872 kB
DirectMap2M:     3350528 kB
DirectMap1G:           0 kB