1 files changed, 12 insertions, 0 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index 4b4e57a9643e..247760729593 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -214,6 +214,18 @@ config HAVE_MLOCKED_PAGE_BIT
 config MMU_NOTIFIER
         bool
 
+config KSM
+        bool "Enable KSM for page merging"
+        depends on MMU
+        help
+          Enable Kernel Samepage Merging: KSM periodically scans those areas
+          of an application's address space that an app has advised may be
+          mergeable.  When it finds pages of identical content, it replaces
+          the many instances by a single resident page with that content, so
+          saving memory until one or another app needs to modify the content.
+          Recommended for use with KVM, or with other duplicative applications.
+          See Documentation/vm/ksm.txt for more information.
+
 config DEFAULT_MMAP_MIN_ADDR
         int "Low address space to protect from user allocation"
         default 4096