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zram, formerly called compcache, is a Linux kernel module for creating a compressed block device in RAM, i.e. a RAM disk with on-the-fly disk compression. The block device created with zram can then be used for swap or as general-purpose RAM disk. The two most common uses for zram are for the storage of temporary files (/tmp) and as a swap ...
It was merged into the Linux kernel mainline in 2014, in kernel version 3.18. [4] [5] It was improved in version 4.0, bringing improvements necessary for e.g. the overlay2 storage driver in Docker. [6] While most Live CD linux distributions used Aufs as of November 2016, Slackware used overlayfs for its live CD. [7]
In 2009 Squashfs was merged into Linux mainline as part of Linux 2.6.29. [ 8 ] [ 9 ] In that process, the backward-compatibility code for older formats was removed. Since then the Squashfs kernel-space code has been maintained in the Linux mainline tree, while the user-space tools remain on the project's GitHub page.
Thus, fragmentation is an important problem in file system research and design. The containment of fragmentation not only depends on the on-disk format of the file system, but also heavily on its implementation. [9] File system fragmentation has less performance impact upon solid-state drives, as there is no mechanical seek time involved. [10]
An otherwise blank disk has five files, A through E, each using 10 blocks of space (for this section, a block is an allocation unit of the filesystem; the block size is set when the disk is formatted and can be any size supported by the filesystem). On a blank disk, all of these files would be allocated one after the other (see example 1 in the ...
Disk partitioning or disk slicing [1] is the creation of one or more regions on secondary storage, so that each region can be managed separately. [2] These regions are called partitions. It is typically the first step of preparing a newly installed disk after a partitioning scheme is chosen for the new disk before any file system is created ...
The introduction of the TRIM command resolves this problem for operating systems that support it like Windows 7, [21] Mac OS (latest releases of Snow Leopard, Lion, and Mountain Lion, patched in some cases), [23] FreeBSD since version 8.1, [24] and Linux since version 2.6.33 of the Linux kernel mainline. [25]
A memory leak may also happen when an object is stored in memory but cannot be accessed by the running code (i.e. unreachable memory). [2] A memory leak has symptoms similar to a number of other problems and generally can only be diagnosed by a programmer with access to the program's source code.