A page fault occurs if ...
A process generates an address within a segment's start and end and the segment permission allows the access (read/write), but the virtual page is not in memory.
| Process virtual memory | |
|---|---|
| Process-specific data page tables, mm_structs, kernel stack |
|
| Physical memory mapped into kernel's virtual memory |
|
| Kernel code and data | |
| User stack | |
| Shared libraries | |
| <-- brk | |
| Heap | |
| Uninitialized Data | |
| Initialized Data | <-- page fault (e.g., on first reference) |
| Program Text | |