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| Loadable kernel module ： ウィキペディア英語版 |
Loadable kernel module
In computing, a loadable kernel module (or LKM) is an object file that contains code to extend the running kernel, or so-called ''base kernel'', of an operating system. LKMs are typically used to add support for new hardware and/or filesystems, or for adding system calls. When the functionality provided by a LKM is no longer required, it can be unloaded in order to free memory and other resources.
Most current Unix-like systems and Microsoft Windows support loadable kernel modules, although they might use a different name for them, such as kernel loadable module (kld) in FreeBSD, kernel extension (kext) in OS X and kernel-mode driver in Windows NT. They are also known as Kernel Loadable Modules (or KLM), and simply as Kernel Modules (KMOD).
== Advantages ==
Without loadable kernel modules, an operating system would have to include all possible anticipated functionality already compiled directly into the base kernel. Much of that functionality would reside in memory without being used, wasting memory, and would require that users rebuild and reboot the base kernel every time they require new functionality. Most operating systems supporting loadable kernel modules will include modules to support most desired functionality.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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