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Commit e9e96b39 authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

mm: allow CONFIG_MIGRATION to be set without CONFIG_NUMA or memory hot-remove 



CONFIG_MIGRATION currently depends on CONFIG_NUMA or on the architecture
being able to hot-remove memory.  The main users of page migration such as
sys_move_pages(), sys_migrate_pages() and cpuset process migration are
only beneficial on NUMA so it makes sense.

As memory compaction will operate within a zone and is useful on both NUMA
and non-NUMA systems, this patch allows CONFIG_MIGRATION to be set if the
user selects CONFIG_COMPACTION as an option.

[akpm@linux-foundation.org: Depend on CONFIG_HUGETLB_PAGE]
Signed-off-by: default avatarMel Gorman <mel@csn.ul.ie>
Reviewed-by: default avatarChristoph Lameter <cl@linux-foundation.org>
Reviewed-by: default avatarRik van Riel <riel@redhat.com>
Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3fe2011f

mm/Kconfig

+14 −3
Original line number Original line Diff line number Diff line
@@ -171,6 +171,15 @@ config SPLIT_PTLOCK_CPUS 
	default "999999" if DEBUG_SPINLOCK || DEBUG_LOCK_ALLOC

	default "999999" if DEBUG_SPINLOCK || DEBUG_LOCK_ALLOC

	default "4"

	default "4"





#

# support for memory compaction

config COMPACTION

	bool "Allow for memory compaction"

	select MIGRATION

	depends on EXPERIMENTAL && HUGETLB_PAGE && MMU

	help

	  Allows the compaction of memory for the allocation of huge pages.



#

#

# support for page migration

# support for page migration

#

#
@@ -180,9 +189,11 @@ config MIGRATION 
	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE

	depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE

	help

	help

	  Allows the migration of the physical location of pages of processes

	  Allows the migration of the physical location of pages of processes

	  while the virtual addresses are not changed. This is useful for

	  while the virtual addresses are not changed. This is useful in

	  example on NUMA systems to put pages nearer to the processors accessing

	  two situations. The first is on NUMA systems to put pages nearer

	  the page.

	  to the processors accessing. The second is when allocating huge

	  pages as migration can relocate pages to satisfy a huge page

	  allocation instead of reclaiming.





config PHYS_ADDR_T_64BIT

config PHYS_ADDR_T_64BIT

	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT

	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT