Documentation/vm/memory-model.rst

6 Physical Memory Model
9 Physical memory in a system may be addressed in different ways. The
10 simplest case is when the physical memory starts at address 0 and
26 All the memory models track the status of physical page frames using
30 mapping between the physical page frame number (PFN) and the
41 non-NUMA systems with contiguous, or mostly contiguous, physical
45 maps the entire physical memory. For most architectures, the holes
56 actual physical pages. In such case, the architecture specific
65 systems with physical memory starting at address different from 0.
70 The DISCONTIGMEM model treats the physical memory as a collection of
75 physical pages belonging to that node. The `node_start_pfn` field of
84 every physical page frame in a node has a `struct page` entry in the
91 which node hosts the physical page and which `pg_data_t` object
109 as hot-plug and hot-remove of the physical memory, alternative memory
113 The SPARSEMEM model presents the physical memory as a collection of
121 physical address that an architecture supports, the
164 addresses that will map the physical pages containing the memory
167 that will allocate the physical memory and create page tables for the
184 `struct page` `mem_map` services for device driver identified physical