From ed0753ad224f0c65133bd7a63180257eecd9f5e3 Mon Sep 17 00:00:00 2001 From: Jasper Ras Date: Wed, 8 Jan 2025 10:48:09 +0100 Subject: vault backup: 2025-01-08 10:48:09 --- 3 resources/linux/filesystems/tmpfs.md | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 3 resources/linux/filesystems/tmpfs.md (limited to '3 resources/linux/filesystems/tmpfs.md') diff --git a/3 resources/linux/filesystems/tmpfs.md b/3 resources/linux/filesystems/tmpfs.md new file mode 100644 index 0000000..624c835 --- /dev/null +++ b/3 resources/linux/filesystems/tmpfs.md @@ -0,0 +1,13 @@ +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. \ No newline at end of file -- cgit v1.2.3