pandora: update defconfig

[pandora-kernel.git] / mm / Kconfig

diff --git a/mm/Kconfig b/mm/Kconfig
index 9c61158..527136b 100644 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -171,6 +171,15 @@ config SPLIT_PTLOCK_CPUS
        default "999999" if DEBUG_SPINLOCK || DEBUG_LOCK_ALLOC
        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
 #
@@ -180,9 +189,11 @@ config MIGRATION
        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.
+         while the virtual addresses are not changed. This is useful in
+         two situations. The first is on NUMA systems to put pages nearer
+         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
        def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT