What is Page table?
A table recording the mapping from virtual page numbers to physical page numbers. The OS builds one per process, and the CPU's MMU walks it to translate addresses. Each entry also holds protection bits.
Field: OS & Hardware
Page table in the explanations
A page table records, for each virtual page number, the corresponding physical page number and protection information such as read/write permissions; the OS builds one per process and the CPU's MMU walks it.
What is the role of a page table?When switching processes, the register pointing to the page table is also switched.
During a context switch, what must be saved for the process…The page table translates 0x00403 into a physical page number, and appending 0xABC yields the physical address.
With 4 KB pages, which pair gives the page number and offse…
Questions that mention Page table (6)
- What is the role of a page table?
- With 32-bit virtual addresses, 4 KB pages and 4-byte page-table entries, how large is a single-level page table?
- With 48 virtual address bits in use, 4 KB pages and 512-entry (9-bit) tables at each level, how many levels must a multilevel page table walk?
- During a context switch, what must be saved for the process being switched out?
- With 4 KB pages, which pair gives the page number and offset of the 32-bit virtual address 0x00403ABC?
- On a multicore system, when the OS modifies a page-table entry to revoke a mapping, what must be done?
Related terms
TLB (translation lookaside buffer) Virtual memory Context switch Stack pointer TLB shootdown ASID Copy-on-write Demand paging Device driver Hypervisor