Documentation/mm/physical_memory.rst

1 .. SPDX-License-Identifier: GPL-2.0
8 architecture-independent abstraction to represent the physical memory. This
13 `Non-Uniform Memory Access (NUMA)
14 <https://en.wikipedia.org/wiki/Non-uniform_memory_access>`_.
15 With multi-core and multi-socket machines, memory may be arranged into banks
42   memory with DMA specific requirements (Documentation/core-api/dma-api.rst),
47   ``CONFIG_ZONE_DMA32`` configuration options. Some 64-bit platforms may need
59   only on some 32-bit architectures and is enabled with ``CONFIG_HIGHMEM``.
69   Documentation/admin-guide/mm/memory-hotplug.rst for additional details.
85 For example, with 32-bit kernel on an x86 UMA machine with 2 Gbytes of RAM the
90   +-------------------------------------------------------------+
92   +-------------------------------------------------------------+
95   +----------+-----------------------+--------------------------+
97   +----------+-----------------------+--------------------------+
108   +--------------------------------+ +--------------------------+
110   +--------------------------------+ +--------------------------+
113   +---------+----------+-----------+ +------------+-------------+
115   +---------+----------+-----------+ +------------+-------------+
124   +-------------+ +-------------+ +-------------+ +-------------+
126   +-------------+ +-------------+ +-------------+ +-------------+
129   +-----+-------+ +-------------+ +-------------+ +-------------+
131   +-----+-------+ +-------------+ +-------------+ +-------------+
143 Linux uses a node-local allocation policy to allocate memory from the node
147 Documentation/admin-guide/mm/numa_memory_policy.rst.
193 For instance, to call a function foo() for each online node::
198 		foo(pgdat);
202 --------------
255   This is a per-node reserve of pages that are not available to userspace
264 …Per-node queue of huge pages that their split was deferred. Defined only when ``CONFIG_TRANSPARENT…
267   Per-node lruvec holding LRU lists and related parameters. Used only when
277   Per-node instance of kswapd kernel thread.
322   Per-node instance of kcompactd kernel thread.
332   Per-CPU VM statistics for the node