micro kernel

Question

Comments

Just go through Galvin once which contains the topics on approcahes of OS design which include layered approach,microkernel approach etc

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If more operations are done in user mode then how kernel could be more secure??

Answer 1

Microkernel design is one of the modern OS designs which is a good design.It is a flexible design .In light of that option a is true.We know that user mode operations are like user level threads which are invisible to OS .Hence any erratic behaviour will not effect the OS most probably.

Whereas kernel mode operations are more sensitive so any erratic behaviour it will be more dangerous for entire system .Also there are security concerns with the kernel mode operation as the operations performed there are priveleged.So more user mode operations indirectly lessen such risk.

Hence for this question , option C) should be the correct option.

Comments

So it means that we should have privileged instructions in our architecture as minimum as possible??

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Only those much should be allowed according to requirement.Not all processes should be allowed to run in kernel mode