config SELECT_MEMORY_MODEL
	def_bool y
	depends on EXPERIMENTAL || ARCH_SELECT_MEMORY_MODEL

choice
	prompt "Memory model"
	depends on SELECT_MEMORY_MODEL
	default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT
	default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT
	default FLATMEM_MANUAL

config FLATMEM_MANUAL
	bool "Flat Memory"
	depends on !(ARCH_DISCONTIGMEM_ENABLE || ARCH_SPARSEMEM_ENABLE) || ARCH_FLATMEM_ENABLE
	help
	  This option allows you to change some of the ways that
	  Linux manages its memory internally.  Most users will
	  only have one option here: FLATMEM.  This is normal
	  and a correct option.

	  Some users of more advanced features like NUMA and
	  memory hotplug may have different options here.
	  DISCONTIGMEM is an more mature, better tested system,
	  but is incompatible with memory hotplug and may suffer
	  decreased performance over SPARSEMEM.  If unsure between
	  "Sparse Memory" and "Discontiguous Memory", choose
	  "Discontiguous Memory".

	  If unsure, choose this option (Flat Memory) over any other.

config DISCONTIGMEM_MANUAL
	bool "Discontiguous Memory"
	depends on ARCH_DISCONTIGMEM_ENABLE
	help
	  This option provides enhanced support for discontiguous
	  memory systems, over FLATMEM.  These systems have holes
	  in their physical address spaces, and this option provides
	  more efficient handling of these holes.  However, the vast
	  majority of hardware has quite flat address spaces, and
	  can have degraded performance from the extra overhead that
	  this option imposes.

	  Many NUMA configurations will have this as the only option.

	  If unsure, choose "Flat Memory" over this option.

config SPARSEMEM_MANUAL
	bool "Sparse Memory"
	depends on ARCH_SPARSEMEM_ENABLE
	help
	  This will be the only option for some systems, including
	  memory hotplug systems.  This is normal.

	  For many other systems, this will be an alternative to
	  "Discontiguous Memory".  This option provides some potential
	  performance benefits, along with decreased code complexity,
	  but it is newer, and more experimental.

	  If unsure, choose "Discontiguous Memory" or "Flat Memory"
	  over this option.

endchoice

config DISCONTIGMEM
	def_bool y
	depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL

config SPARSEMEM
	def_bool y
	depends on SPARSEMEM_MANUAL

config FLATMEM
	def_bool y
	depends on (!DISCONTIGMEM && !SPARSEMEM) || FLATMEM_MANUAL

config FLAT_NODE_MEM_MAP
	def_bool y
	depends on !SPARSEMEM

#
# Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
# to represent different areas of memory.  This variable allows
# those dependencies to exist individually.
#
config NEED_MULTIPLE_NODES
	def_bool y
	depends on (DISCONTIGMEM || NUMA)

config HAVE_MEMORY_PRESENT
	def_bool y
	depends on ARCH_HAVE_MEMORY_PRESENT || SPARSEMEM

config SNSC_SECTION_NR_OUT_OF_PAGE_FLAG
	bool "section number out of page flag"
	default n
	depends on SPARSEMEM
	help
	  Originally section number is kept as part of page flag, causing
	  min section size has to be 4MB. Say Y to store the section number
	  out of page flag, which consumes more memory, but makes possible
	  a smaller section size.

config SNSC_SPARSE_SECTION_SHIFT
	int "section size for SPARSE_MEM"
	default 25
	depends on SPARSEMEM
	help
	  Select section size for SPARSE_MEM as power of 2.
	  Note that (MAX_ORDER - 1 + PAGE_SHIFT) > SPARSE_SECTION_SHIFT
	  is a must.

config SNSC_MAX_SECTION_GROUP_NR
       int "Max section group number"
       default 8
       depends on SNSC_GROUP_SPARSEMEM_SECTIONS
       help
         Max number of section groups that can be specified by "secgrp=" in
         kernel cmd line.

config SNSC_4K_KERNEL_COMMAND_LINE
       bool "Enlarge kernel command line size to 4K"
       default n
       help
         Enlarge kernel command line size to 4K.

#
# SPARSEMEM_EXTREME (which is the default) does some bootmem
# allocations when memory_present() is called.  If this cannot
# be done on your architecture, select this option.  However,
# statically allocating the mem_section[] array can potentially
# consume vast quantities of .bss, so be careful.
#
# This option will also potentially produce smaller runtime code
# with gcc 3.4 and later.
#
config SPARSEMEM_STATIC
	bool

#
# Architecture platforms which require a two level mem_section in SPARSEMEM
# must select this option. This is usually for architecture platforms with
# an extremely sparse physical address space.
#
config SPARSEMEM_EXTREME
	def_bool y
	depends on SPARSEMEM && !SPARSEMEM_STATIC

config SPARSEMEM_VMEMMAP_ENABLE
	bool

config SPARSEMEM_VMEMMAP
	bool "Sparse Memory virtual memmap"
	depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
	default y
	help
	 SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise
	 pfn_to_page and page_to_pfn operations.  This is the most
	 efficient option when sufficient kernel resources are available.

config SNSC_MEMPLUG
       bool "Enable memplug"
       default n
       depends on ARM

config MEMORY_HOTPLUG_SPARSE
	def_bool y
	depends on SPARSEMEM && MEMORY_HOTPLUG

# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
	bool "Allow for memory hot plug"
	default y
	depends on SPARSEMEM || X86_64_ACPI_NUMA
	depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
	depends on (IA64 || X86 || PPC64 || SUPERH || S390 || ARM)
	depends on SNSC_MEMPLUG

comment "Memory hotplug is currently incompatible with Software Suspend"
	depends on SPARSEMEM && HOTPLUG && HIBERNATION

config MEMORY_HOTREMOVE
	bool "Allow for memory hot remove"
	default y
	depends on MEMORY_HOTPLUG && ARCH_ENABLE_MEMORY_HOTREMOVE
	depends on NUMA
	depends on MIGRATION
	depends on SNSC_MEMPLUG

config SNSC_RELEASE_ON_HOTREMOVE
	bool "Release clean pages instead of migration"
	default n
	depends on MEMORY_HOTREMOVE
	help
	  Release clean pages instead of migration

config SNSC_OOMK_ON_HOTREMOVE_FAILURE
	bool "Invoke oom killer when memory is not enough while hot-removing"
	default n
	depends on MEMORY_HOTREMOVE
	help
	  Invoke oom killer when memory is not enough while hot-removing

config SNSC_FREEZE_PROCESSES_BEFORE_HOTREMOVE
	bool "Freeze processes before hot remove and thaw them after"
	default y
	depends on MEMORY_HOTREMOVE
	depends on PM
	help
	  Freeze processes before hot remove and thaw them after

config SNSC_PROCESSES_FREEZE_THAW_TIME_MEASUREMENT
	bool "Measure processes freeze/thaw time"
	default n
	depends on SNSC_FREEZE_PROCESSES_BEFORE_HOTREMOVE
	help
	  Measure processes freeze/thaw time

config SNSC_USE_NODE_ORDER
	bool "Use nodeorder= to specify memory allocation order"
	default y
	depends on MEMORY_HOTREMOVE
	help
	  Use nodeorder= to specify memory allocation order

config SNSC_MAX_NODEORDER
	int "Max nodeorder number"
	default "8"
	depends on SNSC_USE_NODE_ORDER
	help
	  Max nodeorder number which can be used in nodeorder= cmdline parameter.

config SNSC_MAX_FILE_NODEORDER
	int "Max num of file_nodeorder"
	default "16"
	depends on SNSC_USE_NODE_ORDER
	help
	  Max num of file_nodeorder= cmdline parameter.

config SNSC_MAX_PATTERN_LEN
	int "Max length of pattern in file_nodeorder"
	default "128"
	depends on SNSC_USE_NODE_ORDER
	help
	  Max length of pattern in file_nodeorder= cmdline parameter.

config SNSC_USE_NODE_ORDER_DEBUG
	bool "Print out nodeorder related debug info"
	default y
	depends on SNSC_USE_NODE_ORDER
	help
	  Print out nodeorder related debug info

config SNSC_KEEP_OFFLINED_PAGES_REFERENCED
	bool
	default y
	depends on (MEMORY_HOTREMOVE && SNSC)
	help
	  Originally pages will be set to unreferenced after being
	  offlined. Say 'y' here to keep offlined pages referenced. This
	  allows drivers to support mmap() of hot-removed regions as
	  Direct-IO buffer.

config SNSC_ENABLE_MMAP_HACK_FOR_DIRECT_IO_TEST
	bool "Enable mmap() hack for Direct IO test"
	default n
	depends on (MEMORY_HOTREMOVE && SNSC)
	help
	  To support testing Direct I/O on /dev/mem region, enable hack of
	  mmap(). Without this, O_DIRECT read/write on region mmap()ing
	  memrsv'ed region through /dev/mem will fail.

config SNSC_MEMPLUG_VERBOSE
	bool "Verbose memplug kernel message"
	default n
	depends on SNSC_MEMPLUG
	help
	  Say 'y' here to show memplug kernel message such as
	  online/offline success/failure, etc.. If say 'n', you have to judge
	  success/failure by checking write()'s return value.

config SNSC_MEMPLUG_ENABLE_MIGRATION_SEMAPHORE
        bool
        default y
        depends on MEMORY_HOTREMOVE
        help
	  Protect page migration with rw_sem. Some places may have race
	  condition with page migration, such as stack shifting and
	  migration pte entry waiting.

#
# If we have space for more page flags then we can enable additional
# optimizations and functionality.
#
# Regular Sparsemem takes page flag bits for the sectionid if it does not
# use a virtual memmap. Disable extended page flags for 32 bit platforms
# that require the use of a sectionid in the page flags.
#
config PAGEFLAGS_EXTENDED
	def_bool y
	depends on 64BIT || SPARSEMEM_VMEMMAP || !NUMA || !SPARSEMEM

config SNSC_MEMORY_RESERVE_SUPPORT
       bool "Memory reserve support"
       def_bool n
       help
         If this configuration is enabled, "memrsv=" can be used in kernel
         command line to specify memory reserve areas.

config SNSC_USE_MEMMAP_AS_MEMRSV
	bool "Use memmap= instead of memrsv= to specify reserved area"
	default n
	depends on ARM
	depends on SNSC_MEMORY_RESERVE_SUPPORT
	help
	  Use memmap= instead of memrsv= to specify reserved area

config SNSC_MAX_RESERVE_AREA
	int "max reservable areas"
	default 4
	depends on SNSC_MEMORY_RESERVE_SUPPORT
	help
	  support for kernel parameters memmap=nn[mMkK][@$#]nn[mMkK]
	  you can set the reserve area by kernel command line below
	  note:
		there is no differences between nn@nn nn#nn nn$nn
		in arm platform

config NODEZERO_ALLOCATION
        bool "Allocate all node-related data on Node 0"
	depends on DISCONTIGMEM || NUMA
	default y

# Heavily threaded applications may benefit from splitting the mm-wide
# page_table_lock, so that faults on different parts of the user address
# space can be handled with less contention: split it at this NR_CPUS.
# Default to 4 for wider testing, though 8 might be more appropriate.
# ARM's adjust_pte (unused if VIPT) depends on mm-wide page_table_lock.
# PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
#
config SPLIT_PTLOCK_CPUS
	int
	default "4096" if ARM && !CPU_CACHE_VIPT
	default "4096" if PARISC && !PA20
	default "4"

#
# support for page migration
#
config MIGRATION
	bool "Page migration"
	def_bool y
	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
	help
	  Allows the migration of the physical location of pages of processes
	  while the virtual addresses are not changed. This is useful for
	  example on NUMA systems to put pages nearer to the processors accessing
	  the page.

config PHYS_ADDR_T_64BIT
	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT

config ZONE_DMA_FLAG
	int
	default "0" if !ZONE_DMA
	default "1"

config BOUNCE
	def_bool y
	depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)

config NR_QUICK
	int
	depends on QUICKLIST
	default "2" if SUPERH || AVR32
	default "1"

config VIRT_TO_BUS
	def_bool y
	depends on !ARCH_NO_VIRT_TO_BUS

config UNEVICTABLE_LRU
	bool "Add LRU list to track non-evictable pages"
	default y
	depends on MMU
	help
	  Keeps unevictable pages off of the active and inactive pageout
	  lists, so kswapd will not waste CPU time or have its balancing
	  algorithms thrown off by scanning these pages.  Selecting this
	  will use one page flag and increase the code size a little,
	  say Y unless you know what you are doing.

config KSWAPD_SHOULD_ONLY_WAIT_ON_IO_IF_THERE_IS_IO
	bool "kswapd should only wait on IO if there is IO"
	default n
	help
	  A kswapd waits the completion of I/O operations, which increase
	  free pages, under some condition. But, it unnecessarily waits
	  when no I/O operation is in progress.
	  Say Y to check whether I/O operation is in progress before
	  waiting.

config MMU_NOTIFIER
	bool

config SNSC_FORK_DCACHE_ALIAS_WORKAROUND
	bool "Workaround for fork dcache alias problem"
	default n
	help
	  This option enables workaround for fork() D-cache alias
	  problem.  A thread may create a dirty cache line on a page
	  while another thread in dup_mmap() is preparing COW for the
	  page.	 Later, the page is copied by copy_user_highpage(),
	  which cannot copy the dirty cache line because it uses its
	  own virtual address. This option avoids this problem by
	  flushing D-cache after flushing TLB at the end of
	  dup_mmap().

config SNSC_PAGE_MIGRATION_ALIAS_FIX
	bool
	default y
	depends on MIGRATION
	help
	  When doing migrate_pages(), by default, kernel don't flush
	  destination page's D-cache. On platforms with virtual alias
	  problem, user program may get incoherent content of the
	  destination page. This option force kernel to flush destination
	  page's D-cache after it's copied.

config SNSC_MM_WAIT_PAGEWRITEBACK
       bool "Wait for page writeback finish under memory poverty condition"
       depends on SNSC
       default n
       help
         Adds wait for page writeback finish to get a free page
	 when try_to_free_pages() is called under the memory poverty condition.

if SNSC
source "mm/Kconfig.snsc"
endif

