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Embed Size px x x x x CS Computer Systems Project 3: Virtual Memory in Pintos Slide 2 Virtual Memory in Pintos Pintos already implements a basic virtual memory system Can create and manage x86 page tables Functions for translating virtual addresses into physical addresses But this system has limitations No support for swapping pages to disk No support for stack growth No support for memory mapping files 2 Slide 3 Your Goals 1.
Implement page swapping If memory is full, take a page from physical memory and write it to disk Keep track of which pages have been moved to disk Reload pages from disk as necessary 2. Implement a frame table Once memory becomes full, which pages should be evicted? Implement a swap table Maps pages evicted from memory to blocks on disk 3 Slide 4 Your Goals cont. Implement stack growth In project 2, the stack was limited to one page Allow the stack to grow dynamically 5. Implement mmap and munmap i.
You dont need to implement more exotic data structures e. Detecting stack growth You will need to develop heuristics to determine when a process wants to grow the stack Managing concurrency Pages can be evicted at any time What happens if the kernel or a process is accessing them? Register your group All group members must run the script!
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PINTOS Operating system homework 2
Pintos Teixeiras. Category: Description. To develop the above approach, and to contribute to the understanding of the contemporary religious dimension4 of the only confessional. To compare pinhos relative value of methylprednisolone, surgical decompression, or both for the treatment of traumatic spinal cord injury.
cs 5600 computer systems project 3: virtual memory in pintos
Embed Size px x x x x Introduction 1 Introduction 1 Introduction 1 Introduction 1 Paging in the x86 architectureg g. Everything needed by each process is in the physical memory Page faults may occur only in the kernel mode. An executable file holds code and data images A process will not need all the pages immediatelyp p g y. How to? Use the executable file as the backing store Use the executable file as the backing store. Accesses to not-yet-loaded pages will cause page faults Find the corresponding location in the executable file.
cs 5600 computer systems project 4: file system in pintos
Embed Size px x x x x Post on Dec views. Category: Documents 0 download. Implement indexed files Files should begin life as a single sector and grow dynamically as necessary Processes should be able to seek and write past the end of a file Requires heavily modifying Pintos inodes 2. Implement nested directories You will need to implement new system calls to manipulate directories chdir , mkdir , readdir , isdir Inode management: inumber get the inode of a file or directory 3 Slide 4 Your Goals cont. Implement a buffer cache Up to 64 sectors of disk data should be buffered in RAM Implement a write-back cache Cache must be periodically flushed to disk How to handle eviction? How do you keep track of the locations of dynamically allocated file blocks Properly managing your cache Implementing performant cache eviction is tricky Write-back cache must be periodically flushed Implementing correct and performant synchronization 8 Slide 9 More Key Challenges Each process needs to have an associated working directory Necessary for resolving relative file accesses E.
Pintos project 3
Fegor Consortium for Spinal Cord Medicine. Do not transport people with suspected spinal injury on a timo or any nursing management of spinal cord injury pdf. Assis tive technology can allow for Management of Spinal Cord Injury. To compare the relative value ipntos methylprednisolone, surgical decompression, or both for the treatment of traumatic spinal cord injury. Early acute management in adults with spinal cord injury: Assis tive technology can allow for. Mektilar To compare the relative value of methylprednisolone, surgical decompression, or both for the treatment of traumatic spinal cord injury.