[PATCH v2] mm: let /proc/meminfo report physical memory installed as "MemTotal"

[Jiang Liu <liuj97@gmail.com>]

As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501,
"MemTotal" from /proc/meminfo means memory pages managed by the buddy
system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo
means phsical pages present (present_pages) within the NUMA node.
There's a difference between managed_pages and present_pages due to
bootmem allocator and reserved pages.

So change /proc/meminfo to report physical memory installed as
"MemTotal", which is
MemTotal = sum(pgdat->present_pages)

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Reported-by: sworddragon2@aol.com
---
Hi David,
	How about this simpilified version?
	Regards!
	Gerry
---
 mm/page_alloc.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e4e8bf1..8e53d6e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2835,7 +2835,13 @@ static inline void show_node(struct zone *zone)
 
 void si_meminfo(struct sysinfo *val)
 {
-	val->totalram = totalram_pages;
+	int nid;
+	unsigned long present_pages = 0;
+
+	for_each_node_state(nid, N_MEMORY)
+		present_pages += node_present_pages(nid);
+
+	val->totalram = present_pages;
 	val->sharedram = 0;
 	val->freeram = global_page_state(NR_FREE_PAGES);
 	val->bufferram = nr_blockdev_pages();
-- 
1.7.9.5

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