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For reading, most operating systems use demand paging. This means that pages are only read from the disk into physical memory when they are needed. In the page table, there is a resident status bit, which says whether or not a valid page resides in physical memory. If the MMU tries to get a physical page number for a valid page which is not resident in physical memory, it issues a pagefault to the operating system. The OS then loads that page from disk, and then returns to the MMU to ?nish the translation.
In addition, many operating systems make some use of pre-fetching, which is called pre-paging when used for pages. The OS guesses which page will be needed next, and begins loading it in the background, to avoid future pagefaults. This depends heavily on locality of accesses, namely that future accesses will be near recent accesses, and this often true.
The dynamic memory allocator is a layer between the application and the OS, managing heap objects. When a program requests memory from the allocator (via malloc(), for instance), t
Give an overview of UNIX based file systems. UNIX and UNIX-like operating systems allocate a device name to each device, other than this isn't how the files on that device are
There is a process bloacked by a semaphore and no other process in the ready queue, can the blocked process get back to the ready queue without the semsignal() function?
Logical File System Responsible for providing the before discussed interface to the user including: File access. Directory operations. Security and protection.
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Q. Presume an operating system maps user-level threads to the kernel using the many-to-many model and the mapping is done through LWPs. Additionally the system allows developers to
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