linux-kernel - [RFT PATCH v1 3/5] mm: set zone->present_pages to number of existing pages in the zone

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Message-Id: <1353254850-27336-4-git-send-email-jiang.liu@huawei.com>
Date:	Mon, 19 Nov 2012 00:07:28 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
Cc:	Jiang Liu <jiang.liu@...wei.com>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Chris Clayton <chris2553@...glemail.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFT PATCH v1 3/5] mm: set zone->present_pages to number of existing pages in the zone

Now all users using "number of pages managed by the buddy system" have
been converted to use zone->managed_pages, so set zone->present_pages
to what it really should be:
	present_pages = spanned_pages - absent_pages;

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
---
 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fe1cf48..5b327d7 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4494,7 +4494,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
 		nr_all_pages += freesize;
 
 		zone->spanned_pages = size;
-		zone->present_pages = freesize;
+		zone->present_pages = realsize;
 		/*
 		 * Set an approximate value for lowmem here, it will be adjusted
 		 * when the bootmem allocator frees pages into the buddy system.
-- 
1.7.9.5

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