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| author | Jasper Ras <jras@hostnet.nl> | 2025-01-13 13:16:06 +0100 |
|---|---|---|
| committer | Jasper Ras <jras@hostnet.nl> | 2025-01-13 13:16:06 +0100 |
| commit | 9232b8d817d4cd4122947375156fa2fa1e9fba14 (patch) | |
| tree | e4feb77f2e508f008b78f722e91488bb9a3f3806 /3 resources/linux/filesystems/Tmpfs.md | |
| parent | ed0753ad224f0c65133bd7a63180257eecd9f5e3 (diff) | |
vault backup: 2025-01-13 13:16:06
Diffstat (limited to '3 resources/linux/filesystems/Tmpfs.md')
| -rw-r--r-- | 3 resources/linux/filesystems/Tmpfs.md | 16 |
1 files changed, 16 insertions, 0 deletions
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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