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-rw-r--r--mm/Kconfig12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 3aa519f52e1..71eb0b4cce8 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