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Diffstat (limited to '3 resources/linux/filesystems/Tmpfs.md')
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diff --git a/3 resources/linux/filesystems/Tmpfs.md b/3 resources/linux/filesystems/Tmpfs.md new file mode 100644 index 0000000..b8fe839 --- /dev/null +++ b/3 resources/linux/filesystems/Tmpfs.md @@ -0,0 +1,16 @@ +#linux #filesystem + +--- +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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