Gate the partitioned and synchronous features of SELECTIVE_KSM behind a KConfig. This shall prevent vanilla KSM's background thread from stepping over SELECTIVE_KSM. Signed-off-by: Sourav Panda <souravpanda@xxxxxxxxxx> --- mm/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index 1b501db06417..f9873002414c 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -783,6 +783,17 @@ config KSM until a program has madvised that an area is MADV_MERGEABLE, and root has set /sys/kernel/mm/ksm/run to 1 (if CONFIG_SYSFS is set). +config SELECTIVE_KSM + bool "Enable Selective KSM for page merging" + depends on KSM + help + Enable Synchronous and Partitioned KSM for page merging. There is + no background scanning. Instead, userspace specifies the pid + and address range to have merged. The partitioning aspect divides + the merge space into security domains. Merging of pages only takes + place within a partition, improving security. Furthermore, trees + in each partitioning becomes smaller, improving CPU efficiency. + config DEFAULT_MMAP_MIN_ADDR int "Low address space to protect from user allocation" depends on MMU -- 2.49.0.395.g12beb8f557-goog
