ksm: Add showmem notifier
KSM is yet another framework which may obfuscate some memory
problems. Use the showmem notifier to show how KSM is being
used to give some insight into potential issues or non-issues.
Change-Id: If82405dc33f212d085e6847f7c511fd4d0a32a10
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
diff --git a/mm/ksm.c b/mm/ksm.c
index f270acc..ce9d1d2 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -37,6 +37,7 @@
#include <linux/freezer.h>
#include <linux/oom.h>
#include <linux/numa.h>
+#include <linux/show_mem_notifier.h>
#include <asm/tlbflush.h>
#include "internal.h"
@@ -250,6 +251,20 @@
sizeof(struct __struct), __alignof__(struct __struct),\
(__flags), NULL)
+static int ksm_show_mem_notifier(struct notifier_block *nb,
+ unsigned long action,
+ void *data)
+{
+ pr_info("ksm_pages_sharing: %lu\n", ksm_pages_sharing);
+ pr_info("ksm_pages_shared: %lu\n", ksm_pages_shared);
+
+ return 0;
+}
+
+static struct notifier_block ksm_show_mem_notifier_block = {
+ .notifier_call = ksm_show_mem_notifier,
+};
+
static int __init ksm_slab_init(void)
{
rmap_item_cache = KSM_KMEM_CACHE(rmap_item, 0);
@@ -2394,6 +2409,8 @@
/* There is no significance to this priority 100 */
hotplug_memory_notifier(ksm_memory_callback, 100);
#endif
+
+ show_mem_notifier_register(&ksm_show_mem_notifier_block);
return 0;
out_free: