From 4f115147ff802267d0aa41e361c5aa5bd933d896 Mon Sep 17 00:00:00 2001
From: Davidlohr Bueso <davidlohr@hp.com>
Date: Wed, 4 Jun 2014 16:06:46 -0700
Subject: mm,vmacache: add debug data

Introduce a CONFIG_DEBUG_VM_VMACACHE option to enable counting the cache
hit rate -- exported in /proc/vmstat.

Any updates to the caching scheme needs this kind of data, thus it can
save some work re-implementing the counting all the time.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/vm_event_item.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'include/linux/vm_event_item.h')

diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 486c3972c0be..ced92345c963 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -80,6 +80,10 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		NR_TLB_LOCAL_FLUSH_ALL,
 		NR_TLB_LOCAL_FLUSH_ONE,
 #endif /* CONFIG_DEBUG_TLBFLUSH */
+#ifdef CONFIG_DEBUG_VM_VMACACHE
+		VMACACHE_FIND_CALLS,
+		VMACACHE_FIND_HITS,
+#endif
 		NR_VM_EVENT_ITEMS
 };
 
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