linux-kernel - [PATCH 1/5] memory-hotplug: x86_64: suitable memory should go to ZONE

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Message-ID: <1405670163-53747-2-git-send-email-wangnan0@huawei.com>
Date:	Fri, 18 Jul 2014 15:55:59 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Ingo Molnar <mingo@...hat.com>, Yinghai Lu <yinghai@...nel.org>,
	"Mel Gorman" <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Pei Feiyue <peifeiyue@...wei.com>, <linux-mm@...ck.org>,
	<x86@...nel.org>, <linux-ia64@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-sh@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/5] memory-hotplug: x86_64: suitable memory should go to ZONE_MOVABLE

This patch add new memory to ZONE_MOVABLE if movable zone is setup
and lower than newly added memory for x86_64.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 arch/x86/mm/init_64.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index df1a992..825915e 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -685,17 +685,23 @@ static void  update_end_of_memory_vars(u64 start, u64 size)
 }
 
 /*
- * Memory is added always to NORMAL zone. This means you will never get
- * additional DMA/DMA32 memory.
+ * Memory is added always to NORMAL or MOVABLE zone. This means you
+ * will never get additional DMA/DMA32 memory.
  */
 int arch_add_memory(int nid, u64 start, u64 size)
 {
 	struct pglist_data *pgdat = NODE_DATA(nid);
 	struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
+	struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
 	unsigned long start_pfn = start >> PAGE_SHIFT;
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 	int ret;
 
+	if (!zone_is_empty(movable_zone))
+		if (zone_spans_pfn(movable_zone, start_pfn) ||
+				(zone_end_pfn(movable_zone) <= start_pfn))
+			zone = movable_zone;
+
 	init_memory_mapping(start, start + size);
 
 	ret = __add_pages(nid, zone, start_pfn, nr_pages);
-- 
1.8.4

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