Memory Page

What

A typical size of page is 4kb (4096 bytes, $2^{12}$ bytes)
For the virtual memory address, we split it into 2 parts, index and offset, index for page and offset for byte in page, so the size of offset is 12 bits, and index is 3 9bit numbers (L2, L1, L0) in RISC-V. Each memory access need 3 memory lookups and it’s expensive, so we use TLB to cache recently used address.

Paging

Thrashing

Thrashing occurs when a system spends more time servicing page faults than executing processes.

Links

• Page Replacement Policy
• Page Table
• Dirty Page