linux-kernel - [PATCH] memory-hotplug: fix NR_FREE

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Date:	Thu, 01 Nov 2012 10:55:01 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Jiang Liu <liuj97@...il.com>,
	Len Brown <len.brown@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	rjw@...k.pl, Lai Jiangshan <laijs@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Lameter <cl@...ux.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mel Gorman <mel@....ul.ie>, Jianguo wu <wujianguo@...wei.com>
Subject: [PATCH] memory-hotplug: fix NR_FREE_PAGES mismatch's fix

When a page is freed and put into pcp list, get_freepage_migratetype()
doesn't return MIGRATE_ISOLATE even if this pageblock is isolated.
So we should use get_pageblock_migratetype() instead of mt to check
whether it is isolated.

Cc: David Rientjes <rientjes@...gle.com>
Cc: Jiang Liu <liuj97@...il.com>
Cc: Len Brown <len.brown@...el.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Minchan Kim <minchan.kim@...il.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Dave Hansen <dave@...ux.vnet.ibm.com>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Jianguo Wu <wujianguo@...wei.com>
Signed-off-by: Wen Congyang <wency@...fujitsu.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 027afd0..e9c19d2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -667,7 +667,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 			/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
 			__free_one_page(page, zone, 0, mt);
 			trace_mm_page_pcpu_drain(page, 0, mt);
-			if (likely(mt != MIGRATE_ISOLATE)) {
+			if (likely(mt != get_pageblock_migratetype(page))) {
 				__mod_zone_page_state(zone, NR_FREE_PAGES, 1);
 				if (is_migrate_cma(mt))
 					__mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
-- 
1.8.0

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