Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Dynamically loadable kernel modules give elasticity when drivers are added to a system however do they have disadvantages too? Under what situations would a kernel be compiled into a single binary file and when would it be better to keep it split into modules? Describe your answer.
Answer: There are two principal disadvantages with the use of modules.
The initial one is size- a module management consumes un-page-able kernel memory as well as a basic kernel with a number of modules loaded will consume more memory than an equivalent kernel with the drivers compiled into the kernel image itself. This can be a extremely significant issue on machines with limited physical memory.
The second disadvantage is that modules can increase the complexity of the kernel bootstrap process. It is hard to load-up a set of modules as of disk if the driver needed to access that disk itself a module that needs to be loaded. Consequently managing the kernel bootstrap with modules can require extra work on the part of the administrator the modules necessary to bootstrap require to be placed into a ram disk image that is loaded alongside the early kernel image when the system is initialized.
In certain cases it is better to utilize a modular kernel as well as in other cases it is better to utilize a kernel with its device drivers pre-linked. Where reducing the size of the kernel is important the choice will depend on how frequently the various device drivers are used. If they are in constant utilize then modules are unsuitable. This is particularly true where drivers are needed for the boot process itself. On the other way if some drivers aren't always needed then the module mechanism allows those drivers to be loaded and unloaded on demand potentially offering a net saving in physical memory.
Where a kernel is to be built that should be usable on a large variety of awfully different machines then building it with modules is clearly preferable to using a single kernel with dozens of unnecessary drivers consuming memory. This is principally the case for commercially distributed kernels where supporting the widest diversity of hardware in the simplestmanner possible are a priority.
Nevertheless if a kernel is being built for a single machine whose configuration is known in move forwards then compiling and using modules may merely be an unnecessary complexity. In cases similar to this the use of modules may well be a matter of taste.
Acyclic-graph directories An acyclic graph permits directories to have shared subdirectories and files. The similar file or subdirectory may be in two dissimilar directories. A
Declare some Applications of Open Source Systems • Finance • Educational • Data Storage and Management • ERP (Enterprise Resource Planning) •File Sharing & FTP
What are the necessary conditions for deadlocks? 1. Mutual exclusion : Only one process at a time is able to use the resource. 2. Hold and wait : A process should be holdi
Q. What are the advantages as well as disadvantages of using circuit switching? For what types of applications is circuit switching a viable strategy? Answer: Circuit
In a multiprogramming and time sharing environment several users share the system simultaneously .what are two such problems?
Developing an application for android encompass different steps as follows: Setup: Development environment is prepared during this phase. This includes downloading and installi
Synchronization In communication among processes messages passed may be blocking or nonblocking - also called as synchronous and asynchronous. Blocking send : The sending pr
In modern operating systems, applications do not directly access the physical memory. Instead, they use so-called virtual memory, where each virtual address is translated to a phys
Q. What are the major advantages of the microkernel approach to system design? Answer: Benefits usually include the following (a) Adding a new service doesn't require modify
Internal file structure All disk I/O is performed in units of single block, and all blocks are the similar size. It is unlikely that the physical record size will exactly match
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd