Subject: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE enabled From: Andrea Arcangeli With transparent hugepage support we need compaction for the "defrag" sysfs controls to be effective. Signed-off-by: Andrea Arcangeli --- diff --git a/mm/Kconfig b/mm/Kconfig --- a/mm/Kconfig +++ b/mm/Kconfig @@ -302,6 +302,7 @@ config NOMMU_INITIAL_TRIM_EXCESS config TRANSPARENT_HUGEPAGE bool "Transparent Hugepage Support" depends on X86 && MMU + select COMPACTION help Transparent Hugepages allows the kernel to use huge pages and huge tlb transparently to the applications whenever possible.