tmpFS

tmpfs is a temporary filesystem that resides in memory and/or swap partition(s). Mounting directories as tmpfs can be an effective way of speeding up accesses to their files, or to ensure that their contents are automatically cleared upon reboot.

Usage

Create a tmpfs: mount -t tmpfs -o [OPTIONS] tmpfs [MOUNT_POINT]

Resize a tmpfs: mount -t tmpfs -o remount,size=<NEW_SIZE> tmpfs [MOUNT_POINT]

Options

Option	Description
size=bytes	Specify an upper limit on the size of the filesystem. Size is given in bytes, rounded up to entire pages. A k, m, or g suffix can be used for Ki, Mi, or Gi. Use % to specify a percentage of physical RAM. Default: 50%. Set to 0 to remove the limit.
nr_blocks=blocks	Similar to size, but in blocks of PAGE_CACHE_SIZE. Accepts k, m, or g suffixes, but not %.
nr_inodes=inodes	Sets the maximum number of inodes. Default is half the number of physical RAM pages or the number of lowmem RAM pages (whichever is smaller). Use k, m, or g suffixes, but % is not supported. Set to 0 to remove the limit.
noswap	Disables swap. Remounts must respect the original settings. By default, swap is enabled.
mode=mode	Sets the initial permissions of the root directory.
gid=gid	Sets the initial group ID of the root directory.
uid=uid	Sets the initial user ID of the root directory.
huge=huge_option	Sets the huge table memory allocation policy for all files (if CONFIG_TRANSPARENT_HUGEPAGE is enabled). Options: never (default), always, within_size, advise, deny, or force.
mpol=mpol_option	Sets NUMA memory allocation policy (if CONFIG_NUMA is enabled). Options: default, prefer:node, bind:nodelist, interleave, interleave:nodelist, or local. Example: mpol=bind:0-3,5,7,9-15.