linux-5.10/mm/Kconfig

1 # SPDX-License-Identifier: GPL-2.0-only
25 	  This option is best suited for non-NUMA systems with
56 	  memory hot-plug systems.  This is normal.
60 	  hot-plug and hot-remove.
138 # Keep arch NUMA mapping infrastructure post-init.
154 	bool "Allow for memory hot-add"
158 	depends on 64BIT || BROKEN
173 	  See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
175 	  Say Y here if you want all hot-plugged memory blocks to appear in
177 	  Say N here if you want the default policy to keep all hot-plugged
186 # Heavily threaded applications may benefit from splitting the mm-wide
190 # ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
191 # PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
193 # a per-page lock leads to problems when multiple tables need to be locked
243 	  linux-mm@kvack.org.
361 	int "Turn on mmap() excess space trimming before booting"
367 	  allocator for chunks in 2^N*PAGE_SIZE amounts - which is frequently
376 	  long-term mappings means that the space is wasted.
386 	  See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
451 	  Cleancache can be thought of as a page-granularity victim cache
453 	  (PFRA) would like to keep around, but can't since there isn't enough
458 	  time-varying size.  And when a cleancache-enabled
465 	  are reduced to a single pointer-compare-against-NULL resulting
478 	  time-varying size.  When space in transcendent memory is available,
480 	  available, all frontswap calls are reduced to a single pointer-
481 	  compare-against-NULL resulting in a negligible performance hit
493 	  subsystems to allocate big physically-contiguous blocks of memory.
534 	  soft-dirty bit on pte-s. This bit it set when someone writes
538 	  See Documentation/admin-guide/mm/soft-dirty.rst for more details.
547 	  compress them into a dynamically allocated RAM-based memory pool.
703 	  zsmalloc is a slab-based memory allocator designed to store
706 	  non-standard allocator interface where a handle, not a pointer, is
724 	int "Maximum user stack size for 32-bit processes (MB)"
729 	  This is the maximum stack size in Megabytes in the VM layout of 32-bit
762 	  See Documentation/admin-guide/mm/idle_page_tracking.rst for
780 	  "device-physical" addresses which is needed for using a DAX
836 	bool "Read-only THP for filesystems (EXPERIMENTAL)"
840 	  Allow khugepaged to put read-only file-backed pages in THP.