[PATCH] mm: update the description for vm_total_pages

[Wang Sheng-Hui <shhuiw@gmail.com>]

vm_total_pages is calculated by nr_free_pagecache_pages(), which counts
the number of pages which are beyond the high watermark within all zones.
So vm_total_pages is not equal to total number of pages which the VM controls.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
---
 mm/vmscan.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0f16ffe..8c7a559 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -136,7 +136,11 @@ struct scan_control {
  * From 0 .. 100.  Higher means more swappy.
  */
 int vm_swappiness = 60;
-unsigned long vm_total_pages;  /* The total number of pages which the VM controls */
+/*
+ * The total number of pages which are beyond the high watermark
+ * within all zones.
+ */
+unsigned long vm_total_pages;

 static LIST_HEAD(shrinker_list);
 static DECLARE_RWSEM(shrinker_rwsem);
-- 
1.8.3.2

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