From: Wang Sheng-Hui <shhuiw@gmail.com>
Date: Wed, 6 Aug 2014 23:07:07 +0000 (-0700)
Subject: mm: update the description for vm_total_pages
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=d0480be44a90af81a425f426c9107fb8f0899f65;p=deliverable%2Flinux.git

mm: update the description for vm_total_pages

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>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 81dd858b9d17..5fec1ba9951f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -137,7 +137,11 @@ 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);