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A light-weight Linux distribution is a Linux distribution that uses lower memory and processor-speed requirements than a more "feature-rich" Linux distribution. The lower demands on hardware ideally result in a more responsive machine, and allow devices with fewer system resources (e.g. older or embedded hardware) to be used
Tiny Core Linux is an example of Linux distribution that run from RAM. This is a list of Linux distributions that can be run entirely from a computer's RAM, meaning that once the OS has been loaded to the RAM, the media it was loaded from can be completely removed, and the distribution will run the PC through the RAM only.
Unlike other operating systems, Linux and Unix allow any file system regardless of the medium it is stored on, whether that medium is a magnetic disk, an optical disk (CD, DVD, etc.), a USB flash memory key, or even contained within a file located on another file system.
When used for swap, zram (like zswap) allows Linux to make more efficient use of RAM, since the operating system can then hold more pages of memory in the compressed swap than if the same amount of RAM had been used as application memory or disk cache. This is particularly effective on machines that do not have much memory.
However, the more compressible the program data is, the more pronounced are the performance improvements as less physical memory is needed to hold the compressed data. For example, in order to maximize the use of a compressed pages cache, Helix Software Company's Hurricane 2.0 provides a user-configurable compression rejection threshold. By ...
Memory overcommitment is a concept in computing that covers the assignment of more memory to virtual computing devices (or processes) than the physical machine they are hosted, or running on, actually has.
The "extra memory" can be used in the page cache to cache frequently used files and metadata, such as directory information, from secondary storage. If the processor and operating system support multiple virtual address spaces, the "extra memory" can be used to run more processes.
Linux (introduced in kernel 2.1.23, it's now one of three memory allocator implementations together with SLOB and SLUB. The three allocators provides a kind of front-end to the zoned buddy allocator for those sections of the kernel that require more flexible memory allocation than the standard 4 KB page size). NetBSD (introduced in 4.0)