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1 # SPDX-License-Identifier: GPL-2.0-only
24 	  This option is best suited for non-NUMA systems with
40 	  memory hot-plug systems.  This is normal.
44 	  hot-plug and hot-remove.
105 # Keep arch NUMA mapping infrastructure post-init.
124 	bool "Allow for memory hot-add"
128 	depends on 64BIT || BROKEN
143 	  See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
145 	  Say Y here if you want all hot-plugged memory blocks to appear in
147 	  Say N here if you want the default policy to keep all hot-plugged
164 # Heavily threaded applications may benefit from splitting the mm-wide
168 # ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
169 # PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
171 # a per-page lock leads to problems when multiple tables need to be locked
221 	  linux-mm@kvack.org.
345 	int "Turn on mmap() excess space trimming before booting"
351 	  allocator for chunks in 2^N*PAGE_SIZE amounts - which is frequently
360 	  long-term mappings means that the space is wasted.
370 	  See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
435 	  Cleancache can be thought of as a page-granularity victim cache
437 	  (PFRA) would like to keep around, but can't since there isn't enough
442 	  time-varying size.  And when a cleancache-enabled
449 	  are reduced to a single pointer-compare-against-NULL resulting
462 	  time-varying size.  When space in transcendent memory is available,
464 	  available, all frontswap calls are reduced to a single pointer-
465 	  compare-against-NULL resulting in a negligible performance hit
477 	  subsystems to allocate big physically-contiguous blocks of memory.
525 	  soft-dirty bit on pte-s. This bit it set when someone writes
529 	  See Documentation/admin-guide/mm/soft-dirty.rst for more details.
538 	  compress them into a dynamically allocated RAM-based memory pool.
695 	  zsmalloc is a slab-based memory allocator designed to store
698 	  non-standard allocator interface where a handle, not a pointer, is
716 	int "Default maximum user stack size for 32-bit processes (MB)"
721 	  This is the maximum stack size in Megabytes in the VM layout of 32-bit
760 	  See Documentation/admin-guide/mm/idle_page_tracking.rst for
793 	  "device-physical" addresses which is needed for using a DAX
835 	bool "Enable infrastructure for get_user_pages()-related unit tests"
838 	  Provides /sys/kernel/debug/gup_test, which in turn provides a way
839 	  to make ioctl calls that can launch kernel-based unit tests for
844 	  the non-_fast variants.
846 	  There is also a sub-test that allows running dump_page() on any
848 	  range of user-space addresses. These pages are either pinned via
861 	bool "Read-only THP for filesystems (EXPERIMENTAL)"
865 	  Allow khugepaged to put read-only file-backed pages in THP.