Next Generation Mobile Phone Case Study Homework help
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Consider the following scenario.
You are working for a company attempting to develop the next generation of mobile phone. Recently, the project lead indicated their disappointment with the performance/responsiveness of the device and proposed to use static relocation to allow processes to access memory directly, improving performance. To minimise the overhead of static reloading, the project manager suggested writing the modified executables to storage for reuse the next time the program is loaded. When the project lead proposed this during the last project meeting, you indicated that this was not a viable solution. You also highlighted how one process would have the ability to read and write the memory of other processes on the system. The project lead has now sent you an email asking for your input on how to proceed:
Subject: Mobile OSes and Static Relocation
I wanted to follow-up on the discussions we had at the last project meeting, where you recommended against proceeding with my proposal to use static relocation for memory management on our new mobile platform. Given the limited time we had during the meeting I’m not convinced I understood what you were saying properly after further investigation, I am still convinced this would be the best approach. Whilst I understand that using protected memory approaches are commonplace in computing today, I also recognise that using static relocation and the performance benefits achievable using that approach could represent a significant competitive advantage for us. I understand the security concerns you raised, however I believe we can develop our app certification program to ensure this would not be an issue.
Can you please explain your concerns to me again and provide your recommendation on how we should proceed?
Hint:From the information above, in your response you will need to explain how static relocation works, how processes use physical memory addressing, how one process can read/write the memory of the other processes, and why this represents a security problem. Given that this will be a more detailed response than comments you supposedly made at the meeting, you should expand on these issues and may introduce any additional additional issues you feel are relevant. Your response should be approximately two pages in length.
1.Illustration of First Come First Served (FCFS), illustration of Shortest Job First (SJF),illustration of Shortest Remaining Time Next (SRTN), illustration of Round Robin (RR) wait times and turnaround times
2.Explanation of why better hardware utilisation results.
3.Explanation of why RR doesn’t favour I/O bound processes.
4. Explanation of what changes could be made to fix this problem.
5. Explanation of overheads for processes reading/writing memory.
6. Explanation of how to reduce/eliminate read/write overheads OR explanation of why it isn’t possible.
7. Explanation of overheads for operations on processes.
8. Explanation of how to reduce/eliminate process operation overheads OR explanation of why it isn’t
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9. Correctly identifies which approach minimises OS computation.
10.Explanation of why that approach minimises OS computation.
11.Correctly identifies which approach minimises memory waste.
12.Explanation of why that approach minimises memory waste.
13.Explanation of how paging systems work, including virtual address space, physical address space,
pages, and page frames.
14. Explanation of what causes a page fault and how it is handled by the operating system.
15. Explanation of why a page fault could occur even though the page is loaded in a page frame.
16. Explanation of how static relocation works;
17. Explanation of how processes use physical memory addressing for static relocation;
18. Explanation of how one process can read/write the memory of another process;
19.Explanation of why reading/writing other processes memory is a security problem;
20. General discussion and addressing of any other issues; and
21. Final recommendation and justification for your recommendation.
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