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Is a [[virtual filesystem]] that is stored in memory; it uses both RAM and swap space.
> Kernel option: CONFIG_TMPFS
`mount -t tmpfs source target`
A tmpfs can only grow to 50% of RAM avail. unless overridden with size=nbytes mount option.
Only consumes RAM for actual usage.
Data is ephemeral/volatile.
Mount stacking: mount over existing /tmp, to improve speed of apps using alot of tmp files, then unmount to delete data.
Kernel uses tmpfs for [[system v shared memory]] and [[shared anonymous memory mappings]].
`/dev/shm` or `/run/shm`: [[glibc]] of [[POSIX]] shared memory and [[POSIX]] semaphores.
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