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-rw-r--r--mm/Kconfig4
-rw-r--r--mm/ksm.c10
2 files changed, 7 insertions, 7 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index edd300aca173..57963c6063d1 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -224,7 +224,9 @@ config KSM
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.
+ See Documentation/vm/ksm.txt for more information: KSM is inactive
+ 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 DEFAULT_MMAP_MIN_ADDR
int "Low address space to protect from user allocation"
diff --git a/mm/ksm.c b/mm/ksm.c
index f7edac356f46..bef1af4f77e3 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -184,11 +184,6 @@ static DEFINE_SPINLOCK(ksm_mmlist_lock);
sizeof(struct __struct), __alignof__(struct __struct),\
(__flags), NULL)
-static void __init ksm_init_max_kernel_pages(void)
-{
- ksm_max_kernel_pages = nr_free_buffer_pages() / 4;
-}
-
static int __init ksm_slab_init(void)
{
rmap_item_cache = KSM_KMEM_CACHE(rmap_item, 0);
@@ -1673,7 +1668,7 @@ static int __init ksm_init(void)
struct task_struct *ksm_thread;
int err;
- ksm_init_max_kernel_pages();
+ ksm_max_kernel_pages = totalram_pages / 4;
err = ksm_slab_init();
if (err)
@@ -1697,6 +1692,9 @@ static int __init ksm_init(void)
kthread_stop(ksm_thread);
goto out_free2;
}
+#else
+ ksm_run = KSM_RUN_MERGE; /* no way for user to start it */
+
#endif /* CONFIG_SYSFS */
return 0;