ISRO-2013-70

Question

Which of the following strategy is employed for overcoming the priority inversion problem?

• A. Temporarily raise the priority of lower priority level process
• B. Have a fixed priority level scheme.
• C. Implement Kernel pre-emption scheme.
• D. Allow lower priority process to complete its job. 

Comments

Good read

https://www.tutorialspoint.com/priority-inversion

https://www.geeksforgeeks.org/priority-inversion-what-the-heck/

Answer 1

The whole problem is due to dragging away the process out of cpu so . answer wil be d . a can solve but all low level will go up and the high priority process will run after a lot more time.  A and d will be the answer if a is for that process only . i think a is for processes. Not process

Comments

how d

cpu holds and execute higher priorty one it will not execute lower priority since it is lower

now cpu waits for lower priorty to finish but it will never happpen as it is holing higher priority one

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priority inversion take place when a low priority process which have hold locks on resource which is required by higher priority process. but it have o wit till lower process finishes and release the resource if the higer process preempt then there will a spin lock so the solution is to just complete the lower level process. it can be done in any of the above ways . make it priority high so that in can complete or just let it finish . same lead to same result . i.e completion of lower priority process first.

Answer 2

Option a is the answer

Answer 3

Answer is A

we have to raise the priority temporarily so that process will get chance to execute.