2017年5月14日 · By coincidence your tmpfs use is about the same size as the unassigned space. I can see how you would assume that is where your HDD is being used up if you don't know how the filesystems work. As explained by Florian, tmpfs are RAMdrives and have nothing to do with your HDD. udev is the device path, it also is not related to HDD space.

2019年6月3日 · The tmpfs driver ignores the “device name” since it doesn't load data from anywhere. These filesystems are created by mounting them and are destroyed by unmounting them. For example, the following command creates a tmpfs filesystem whose contents is just the root directory (all tmpfs filesystems start out this way), owned by root and with ...

2019年6月12日 · tmpfs - essentially is a virtual filesystem located in RAM instead of a disk device. Since it's a filesystem, data saved there has a certain order, just like a regular filesystem for a disk storage would have, however the files reside in memory and are not persistent (that is, those files will be gone next time you power off the computer - and ...

2018年5月10日 · Recent 2.6 Linux kernel builds have started to offer /dev/shm as shared memory in the form of a ramdisk, more specifically as a world-writable directory that is stored in memory with a defined limit in /etc/default/tmpfs. /dev/shm support is …

2018年5月17日 · tmpfs is treated the same as any other swappable memory See the kernel commit " vmscan: split LRU lists into anon & file sets " - Split the LRU lists in two, one set for pages that are backed by real file systems ("file") and one for pages that are backed by memory and swap ("anon").

2016年5月29日 · There is nothing abnormal about having tmpfs filesystems in your Linux box. tmpfs is a memory only filesystem, much like the "RAM disks" of other operating systems. As the name implies, the content lives in RAM, so it goes away after a reboot.

2011年12月9日 · Linux provides a tmpfs device which any user can use, /dev/shm. It is not mounted to a specific directory by default, but you can still use it as one. Simply create a directory in /dev/shm and then symlink it to wherever you want. You can give the created directory any permissions you choose, so that other users can't access it.

If CONFIG_TMPFS is not set, the user visible part of tmpfs is not build. But the internal mechanisms are always present. glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for POSIX shared memory (shm_open, shm_unlink). Adding the following line to /etc/fstab should take care of this: tmpfs /dev/shm tmpfs defaults 0 0

tmpfs works the same as ramfs, except that it can use swap space if you have one. I.e. if you need RAM for something else, the Least Recently Used algorithms may select data blocks from tmpfs and swap them to disk. Most people stick with tmpfs, because it also lets you limit the total size, and shows the space used correctly e.g. in the df ...

Debian doesn't make /tmp tmpfs by default, but you can make it so by editing /etc/default/tmpfs and changing the RAMTMP line to RAMTMP=yes ¹ This isn't a RAM disk: it doesn't reserve memory, only the space used for files takes up memory, and its pages can be swapped out just like application data.