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Subject[PATCH 1/7] Allow CONFIG_MIGRATION to be set without CONFIG_NUMA
Date
CONFIG_MIGRATION currently depends on CONFIG_NUMA. The current users of
page migration such as sys_move_pages(), sys_migrate_pages() and cpuset
process migration are ordinarily only beneficial on NUMA.

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.

TODO
o After this patch is applied, the migration core is available but it
also makes NUMA-specific features available. This is too much
exposure so revisit this.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
---
mm/Kconfig | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index 17b8947..1d8e2b2 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -168,12 +168,22 @@ config SPLIT_PTLOCK_CPUS
default "4"

#
+# support for memory compaction
+config COMPACTION
+ bool "Allow for memory compaction"
+ def_bool y
+ select MIGRATION
+ depends on EXPERIMENTAL && HUGETLBFS
+ help
+ Allows the compaction of memory for the allocation of huge pages.
+
+#
# support for page migration
#
config MIGRATION
bool "Page migration"
def_bool y
- depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE
+ depends on NUMA || ARCH_ENABLE_MEMORY_HOTREMOVE || COMPACTION
help
Allows the migration of the physical location of pages of processes
while the virtual addresses are not changed. This is useful for
--
1.6.5


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