Which bit in the PTE does the operating system use for approximating LRU replacement? Does a TLB miss always/sometimes/never result in a paging from disk?
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A: Please see the next step for answer.
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- Which bit in the PTE does the
operating system use for approximating LRU replacement? - Does a TLB miss always/sometimes/never result in a paging from disk?
- What are the two components of a virtual address used in segmented virtual memory?
- In what Nachos file was StartProcess implemented?
- What kind of pages in a process’ virtual address space are usually protected as “Read Only”?
- Is it possible to implement a file system inside of a file stored in another file system?
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- A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) what can be done about it?A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs.Q.) What happens next?Suppose we have a system with 50 active processes, P0, P1, ..., P49, some user processes, and some kernel processes. For simplicity, we are not concerned with threads in this question. Ready processes are scheduled to Run by some scheduler. The scheduling algorithm does not matter here. Suppose process P13 makes a disk_read() operating system call. Assume that the completion of disk transfer is signalled by an interrupt from the disk controller. Trace as accurately as you can what happens in the CPU (not the disk) until process P13 has received its requested information from the disk. Hints: The question is about interrupt handling I am looking for a trace of what processes run, why, and what they do. I am not looking for instruction-level explanations. I am not looking for a discussion of disk access, operation, or transfer.
- Suppose we have a system with 50 active processes, P0, P1, ..., P49, some user processes, and some kernel processes. For simplicity, we are not concerned with threads in this question. Ready processes are scheduled to Run by some scheduler. The scheduling algorithm does not matter here. Suppose process P13 makes a disk_read() operating system call. Assume that completion of disk transfer is signaled by an interrupt from the disk controller. Trace as accurately as you can what happens in the CPU (not the disk) until process P13 has received its requested information from the disk. Hints: The question is about interrupt handlingI am looking for a trace of what processes run, why, and what they do.I am not looking for instruction-level explanations.I am not looking for a discussion of disk access, operation, or transfer.What is the purpose of the trampoline page? Why do both kernel address space and user process address space map the trampoline page to the same virtual address?The NX (“no execute”) bit can also be supported by modern CPUs. To force a CPU to avoid running the code on a file, set the NX bit to 1 on that page. Currently, the OS and paging hardware implement this maximum quantity. Keep in mind that non-X86-compliant software/hardware can be executed on an OS and hardware How about a parser who wants to enforce NX above the operating system level? The programmer inserts a nX-bit association with each memory page at the bottom (in other words, at each memory location of nX bits.) The programmer imposes a size limit of 4095 bytes for application-level data structures. each stack frame is allocated in its own page, and no stack frame is larger than a page. At a given point in time, a stack frame might look like this: |-----------------------| | | +-----------------------+ entry %esp-->| return address | +-----------------------+ new %ebp---->| saved %ebp | +-----------------------+ | buf[4] | | buf[3] | | buf[1] | | buf[0] |…
- Which hardware configurations are necessary to guarantee the effectiveness of virtual memory systems? Do you know how they are carried out? At least two samples must be collected.A system with simple paged memory management has addresses of B bits and pages of size P KiB. If all memory is pageable, what is the maximum number of items contained in a process's page table? What if K KiB are reserved for the kernel and are not pageable? Also suppose that the page table is organized in 2 levels, so that the page directory (first level) is addressed by D bits. How many bits will be used to address the second level? How many entries will there be, at most, among all the tables of the pages (first and second level) of a process?What is the purpose of each of the two most important files created by a Type II hypervisor when preparing a new virtual machine?
- When you refer to the partitioning of operating systems, could you perhaps explain what precisely you mean by saying that? Kindly explain both the good and the bad elements of them.There is no way to adjust the tempo. According to the rule, the process must to remain in main memory at all times for it to be possible to execute it. As a consequence, External Fragmentation occurs.Answer the following questions:i. (a) What are relocatable programs? (b) What makes a program relocatable? (c) From the OS memory management context, why programs (processes) need to be relocatable? What is (are) the advantage(s) and/or disadvantage(s) of small versus big page sizes? What is (are) the advantage(s) of paging over segmentation? What is (are) the advantage(s) of segmentation over paging? Explain your answers.Which memory management method offers the most benefits?
