tmpfs (Temporary File System) is a virtual filesystem to store files in memory.
You need to activate the following kernel options:
|Tmpfs POSIX Access Control Lists||Enable ACL permissions.|
|Tmpfs extended attributes||Enable metadata support.|
Generation and mounting of tmpfs is on step:
You can specify the mount option size to control the maximum size of the filesystem (default: half of your memory). Note, that tmpfs doesn't reserve this memory, but allocates only the needed memory.