Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+=================
+Memory Management
+=================
+
+Linux memory management subsystem is responsible, as the name implies,
+for managing the memory in the system. This includes implemnetation of
+virtual memory and demand paging, memory allocation both for kernel
+internal structures and user space programms, mapping of files into
+processes address space and many other cool things.
+
+Linux memory management is a complex system with many configurable
+settings. Most of these settings are available via ``/proc``
+filesystem and can be quired and adjusted using ``sysctl``. These APIs
+are described in Documentation/admin-guide/sysctl/vm.rst and in `man 5 proc`_.
+
+.. _man 5 proc: http://man7.org/linux/man-pages/man5/proc.5.html
+
+Linux memory management has its own jargon and if you are not yet
+familiar with it, consider reading
+:ref:`Documentation/admin-guide/mm/concepts.rst <mm_concepts>`.
+
+Here we document in detail how to interact with various mechanisms in
+the Linux memory management.
+
+.. toctree::
+   :maxdepth: 1
+
+   concepts
+   cma_debugfs
+   hugetlbpage
+   idle_page_tracking
+   ksm
+   memory-hotplug
+   nommu-mmap
+   numa_memory_policy
+   numaperf
+   pagemap
+   soft-dirty
+   transhuge
+   userfaultfd