Groups > linux.kernel > #1209698

[PATCH] Memory hot added,The memory can not been added to movable zone

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From	Changsheng Liu <liuchangsheng@inspur.com>
Newsgroups	linux.kernel
Subject	[PATCH] Memory hot added,The memory can not been added to movable zone
Date	Wed, 19 Aug 2015 10:20:01 +0200
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From: Changsheng Liu <liuchangcheng@inspur.com>

When memory hot added, the function should_add_memory_movable
always return 0,because the movable zone is empty,
so the memory that hot added will add to normal zone even if
we want to remove the memory.
So we change the function should_add_memory_movable,if the user
config CONFIG_MOVABLE_NODE it will return 1 when
movable zone is empty

Signed-off-by: Changsheng Liu <liuchangcheng@inspur.com>
---
 mm/memory_hotplug.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 26fbba7..2b0aec4 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1198,9 +1198,13 @@ static int should_add_memory_movable(int nid, u64 start, u64 size)
 	pg_data_t *pgdat = NODE_DATA(nid);
 	struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
 
-	if (zone_is_empty(movable_zone))
+	if (zone_is_empty(movable_zone)) {
+	#ifdef CONFIG_MOVABLE_NODE
+		return 1;
+	#else
 		return 0;
-
+	#endif
+	}
 	if (movable_zone->zone_start_pfn <= start_pfn)
 		return 1;
 
-- 
1.7.1

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Thread

[PATCH] Memory hot added,The memory can not been added to movable zone Changsheng Liu <liuchangsheng@inspur.com> - 2015-08-19 10:20 +0200
  Re: [PATCH] Memory hot added,The memory can not been added to  movable zone Andrew Morton <akpm@linux-foundation.org> - 2015-08-20 02:00 +0200
    Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Changsheng Liu <liuchangsheng@inspur.com> - 2015-08-20 08:00 +0200
    Re: [PATCH] Memory hot added,The memory can not been added to  movable zone Yasuaki Ishimatsu <yasu.isimatu@gmail.com> - 2015-08-24 21:30 +0200
      Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Changsheng Liu <liuchangsheng@inspur.com> - 2015-08-25 12:30 +0200
        Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Vlastimil Babka <vbabka@suse.cz> - 2015-08-25 13:20 +0200
          Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Changsheng Liu <liuchangsheng@inspur.com> - 2015-08-26 02:40 +0200
            Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Vlastimil Babka <vbabka@suse.cz> - 2015-08-26 08:20 +0200
              Re: [PATCH] Memory hot added,The memory can not been added to movable  zone Changsheng Liu <liuchangsheng@inspur.com> - 2015-08-26 10:00 +0200

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