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ksm: Add showmem notifier

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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>
This commit is contained in:
Laura Abbott 2014-09-24 15:53:57 -07:00
parent ed1aff26c1
commit 28851c135c
1 changed files with 17 additions and 0 deletions
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17
mm/ksm.c
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@ -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 @@ static DEFINE_SPINLOCK(ksm_mmlist_lock);
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);
@ -2494,6 +2509,8 @@ static int __init ksm_init(void)
/* 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: