[mirror_ubuntu-artful-kernel.git] / mm / Kconfig

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 FLATMEM_MANUAL

config FLATMEM_MANUAL
	bool "Flat Memory"
	depends on !ARCH_DISCONTIGMEM_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.

	  If unsure, choose this option over any other.

config DISCONTIGMEM_MANUAL
	bool "Discontigious 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 extra overhead that
	  this option imposes.

	  Many NUMA configurations will have this as the only option.

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

endchoice

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

config FLATMEM
	def_bool y
	depends on !DISCONTIGMEM || FLATMEM_MANUAL

#
# 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
Commit	Line	Data
e1785e85 DH	1	config SELECT_MEMORY_MODEL
	2	def_bool y
	3	depends on EXPERIMENTAL \|\| ARCH_SELECT_MEMORY_MODEL
	4
3a9da765 DH	5	choice
3a9da765 DH	6	prompt "Memory model"
e1785e85 DH	7	depends on SELECT_MEMORY_MODEL
	8	default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT
	9	default FLATMEM_MANUAL
3a9da765	10
e1785e85	11	config FLATMEM_MANUAL
3a9da765 DH	12	bool "Flat Memory"
	13	depends on !ARCH_DISCONTIGMEM_ENABLE \|\| ARCH_FLATMEM_ENABLE
	14	help
	15	This option allows you to change some of the ways that
	16	Linux manages its memory internally. Most users will
	17	only have one option here: FLATMEM. This is normal
	18	and a correct option.
	19
	20	If unsure, choose this option over any other.
	21
e1785e85	22	config DISCONTIGMEM_MANUAL
3a9da765 DH	23	bool "Discontigious Memory"
	24	depends on ARCH_DISCONTIGMEM_ENABLE
	25	help
785dcd44 DH	26	This option provides enhanced support for discontiguous
	27	memory systems, over FLATMEM. These systems have holes
	28	in their physical address spaces, and this option provides
	29	more efficient handling of these holes. However, the vast
	30	majority of hardware has quite flat address spaces, and
	31	can have degraded performance from extra overhead that
	32	this option imposes.
	33
	34	Many NUMA configurations will have this as the only option.
	35
3a9da765 DH	36	If unsure, choose "Flat Memory" over this option.
	37
	38	endchoice
	39
e1785e85 DH	40	config DISCONTIGMEM
	41	def_bool y
	42	depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) \|\| DISCONTIGMEM_MANUAL
	43
	44	config FLATMEM
	45	def_bool y
	46	depends on !DISCONTIGMEM \|\| FLATMEM_MANUAL
	47
93b7504e DH	48	#
	49	# Both the NUMA code and DISCONTIGMEM use arrays of pg_data_t's
	50	# to represent different areas of memory. This variable allows
	51	# those dependencies to exist individually.
	52	#
	53	config NEED_MULTIPLE_NODES
	54	def_bool y
	55	depends on DISCONTIGMEM \|\| NUMA