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definition - Monolithic_kernel

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Monolithic kernel

                   

A monolithic kernel is an operating system architecture where the entire operating system is working in the kernel space and alone as supervisor mode. The monolithic differs from other operating system architectures (such as the microkernel architecture)[1][2] in that it defines alone a high-level virtual interface over computer hardware, with a set of primitives or system calls to implement all operating system services such as process management, concurrency, and memory management itself and one or more device drivers as modules.

  Structure of monolithic kernel, microkernel and hybrid kernel-based operating systems

Contents

  Loadable modules

Modular operating systems such as OS-9 and most modern monolithic operating systems such as OpenVMS, Linux, BSD, and UNIX variants such as SunOS, and AIX, in addition to MULTICS, can dynamically load (and unload) executable modules at runtime. This modularity of the operating system is at the binary (image) level and not at the architecture level. Modular monolithic operating systems are not to be confused with the architectural level of modularity inherent in Server-Client operating systems (and its derivatives sometimes marketed as hybrid kernel) which use microkernels and servers (not to be mistaken to modules or daemons). Practically speaking, dynamically loading modules is simply a more flexible way of handling the operating system image at runtime — as opposed to rebooting with a different operating system image. The modules allow easy extension of the operating systems's capabilities as required. Dynamically loadable modules incur a small overhead when compared to building the module into the operating system image. However, in some cases, loading modules dynamically (as-needed) helps to keep the amount of code running in kernel space to a minimum; for example, to minimize operating system footprint for embedded devices or with limited hardware resources. Namely, an unloaded module need not to be stored in the scarce random access memory.

  Monolithic architecture examples

  References

  See also

   
               

 

All translations of Monolithic_kernel


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