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Kernel SamePage Merging
In computing, kernel same-page merging (KSM), also known as kernel shared memory, memory merging, memory deduplication, and page deduplication is a kernel feature that makes it possible for a hypervisor system to share memory pages that have identical contents between multiple processes or virtualized guests. While not directly linked, Kernel-based Virtual Machine (KVM) can use KSM to merge memory pages occupied by virtual machines. Deduplication KSM performs memory deduplication by scanning through main memory for physical pages that have identical content, and identifies the virtual pages that are mapped to those physical pages. It leaves one page unchanged, and re-maps each duplicate page to point to the same physical page, after which it releases the extra physical pages for re-use. It also marks both virtual pages as " copy-on-write" (COW), so that kernel will automatically remap a virtual page back to having its own separate physical page as soon as any process begins to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Direct Rendering Manager
The Direct Rendering Manager (DRM) is a subsystem of the Linux kernel responsible for interfacing with Graphics processing unit, GPUs of modern video cards. DRM exposes an Application programming interface, API that user-space programs can use to send commands and data to the GPU and perform operations such as configuring the mode setting of the display. DRM was first developed as the kernel-space component of the X.Org Server, X Server Direct Rendering Infrastructure, but since then it has been used by other graphic stack alternatives such as Wayland (display server protocol), Wayland and standalone applications and libraries such as Simple DirectMedia Layer , SDL2 and Kodi (software) , Kodi. User-space programs can use the DRM API to command the GPU to do hardware acceleration, hardware-accelerated 3D rendering and video decoding, as well as General-purpose computing on graphics processing units, GPGPU computing. Overview The Linux kernel already had an Application program ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |