Monolithic, Mikrokernel and Exokernel
... abstractions than the typical Unix primitives. In addition to the new mechanisms, providing an API compatible with Unix or another conventional operating system was a sine qua non; hence implementing Unix on top of the new systems was a natural consequence. Therefore, the microkernel idea became wid ...
... abstractions than the typical Unix primitives. In addition to the new mechanisms, providing an API compatible with Unix or another conventional operating system was a sine qua non; hence implementing Unix on top of the new systems was a natural consequence. Therefore, the microkernel idea became wid ...
Operating System Architecture and Distributed Systems
... while coexisting with a non-real-time application such as web browsing. That is kernel would provide only the most basic mechanisms upon which the general resource management tasks at a node are carried out. Server modules would be dynamically loaded as required, to implement the required RM policie ...
... while coexisting with a non-real-time application such as web browsing. That is kernel would provide only the most basic mechanisms upon which the general resource management tasks at a node are carried out. Server modules would be dynamically loaded as required, to implement the required RM policie ...
Solaris System Management - Understanding System Concepts -
... File System – collection of directories and files organized in a hierarchical tree structure. It has 11 correspondence to physical storage. Root filesystem (/) is the parent of all filesystems. Mount Point – the directory name on the parent file system where a separate file system may be attac ...
... File System – collection of directories and files organized in a hierarchical tree structure. It has 11 correspondence to physical storage. Root filesystem (/) is the parent of all filesystems. Mount Point – the directory name on the parent file system where a separate file system may be attac ...
L03_Processes
... operating system is divided into a number of layers or levels, each built on top of lower layers. The lowest layer is the hardware; the highest is the user interface. Layers are selected such that each uses functions and services of only lower-level layers. ...
... operating system is divided into a number of layers or levels, each built on top of lower layers. The lowest layer is the hardware; the highest is the user interface. Layers are selected such that each uses functions and services of only lower-level layers. ...
Operating Systems CMPSC 473
... • OS competes with the processes for resources – E.g., OS uses disk to swap ...
... • OS competes with the processes for resources – E.g., OS uses disk to swap ...
CS4023_-_lecture_05_-_0910
... However, most generalpurpose UNIX systems use only two rings, even if the hardware it runs on provides more CPU modes than that. ...
... However, most generalpurpose UNIX systems use only two rings, even if the hardware it runs on provides more CPU modes than that. ...
Mid1_Revision
... minimal functions in the kernel and implement higher level OS features in other modules (running either in user mode or kernel mode). As monolithic kernel if it can be made bug free can on average perform better than a microkernel system that has some additional communication overhead between compon ...
... minimal functions in the kernel and implement higher level OS features in other modules (running either in user mode or kernel mode). As monolithic kernel if it can be made bug free can on average perform better than a microkernel system that has some additional communication overhead between compon ...
Operating System: A Software Engineering Perspective
... File system requires virtual memory services (buffers) Virtual memory would like to use files for its backing store ...
... File system requires virtual memory services (buffers) Virtual memory would like to use files for its backing store ...
OS imp structures
... • MS-DOS – written to provide the most functionality in the least space – Not divided into modules – Interfaces and levels of functionality not well separated ...
... • MS-DOS – written to provide the most functionality in the least space – Not divided into modules – Interfaces and levels of functionality not well separated ...
[Lecture 1, part 3] Kernel interaction with the hardware: Interrupt
... Like input / output, user input, between kernel and device driver. Devices call back by interrupts. They are serviced immediately. And they are user transparent. Implementation: Each device only has limited number of interrupt events. So we can define an interrupt table For each element, there is a ...
... Like input / output, user input, between kernel and device driver. Devices call back by interrupts. They are serviced immediately. And they are user transparent. Implementation: Each device only has limited number of interrupt events. So we can define an interrupt table For each element, there is a ...
OPERATING SYSTEMS DESIGN AND IMPLEMENTATION Third
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
... Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance ...
Kernel (operating system)
In computing, the kernel is a computer program that manages I/O requests from software, and translates them into data processing instructions for the central processing unit and other electronic components of a computer. The kernel is a fundamental part of a modern computer's operating system.The critical code of the kernel is usually loaded into a protected area of memory, which prevents it from being overwritten by other, less frequently used parts of the operating system or by applications. The kernel performs its tasks, such as executing processes and handling interrupts, in kernel space, whereas everything a user normally does, such as writing text in a text editor or running programs in a GUI (graphical user interface), is done in user space. This separation prevents user data and kernel data from interfering with each other and thereby diminishing performance or causing the system to become unstable (and possibly crashing). When a process makes requests of the kernel, the request is called a system call. Various kernel designs differ in how they manage system calls and resources. For example, a monolithic kernel executes all the operating system instructions in the same address space in order to improve the performance of the system. A microkernel runs most of the operating system's background processes in user space, to make the operating system more modular and, therefore, easier to maintain.The kernel's interface is a low-level abstraction layer.