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Microkernel Systems

Microkernel Systems. - Jatin Lodhia. What is Microkernel. A microkernel is a minimal computer operating system kernel which, in its purest form, provides no operating-system services at all, only the mechanisms needed to implement those services. Microkernel. A microkernel contains :

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Microkernel Systems

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  1. Microkernel Systems - JatinLodhia

  2. What is Microkernel • A microkernel is a minimal computer operating system kernel which, in its purest form, provides no operating-system services at all, only the mechanisms needed to implement those services.

  3. Microkernel • A microkernel contains : • Process management • memory management • inter-process communication (IPC) • The microkernel is the only part of the system executing in a kernel mode

  4. Operating System Services • The operating system services run as applications on top of a microkernel.

  5. Tanenbaum-Torvalds debate Dr. Andrew S. Tanenbaum Minix Linus Torvalds

  6. Advantages of Microkernel • Simpler Kernel • Easy to debug • Easy to maintain • Easy to add/change services • Better security • Distributed services over the network

  7. Advantages of a monolithic kernel • Better Performance • Less number of mode changes

  8. security and stability • Failure of one service does not affect the OS and other services. • As services run in the user space as application programs, they can be easily restarted on failure. • A buffer overflow in a service cannot exploit kernel mode.

  9. IPC • IPC is nothing but message passing. • It can be synchronous or asynchronous • Application requests for a service: • Application sends a message to the service (running as an application) via the Microkernel. • The service responds with the result through the Microkernel . • This requires 8 mode changes & 2 context switches

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