linux-kernel - [RFC PATCH 14/23 V2] slub, hotplug: ignore unrelated node's hot-adding and hot-removing

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Date:	Thu, 2 Aug 2012 14:01:19 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org
Subject: [RFC PATCH 14/23 V2] slub, hotplug: ignore unrelated node's hot-adding and hot-removing

SLUB only fucus on the nodes which has normal memory, so ignore the other
node's hot-adding and hot-removing.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 mm/slub.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 8c691fa..4c5bdc0 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3577,6 +3577,9 @@ static void slab_mem_offline_callback(void *arg)
 	if (offline_node < 0)
 		return;
 
+	if (page_zonenum(pfn_to_page(marg->start_pfn)) > ZONE_NORMAL)
+		return;
+
 	down_read(&slub_lock);
 	list_for_each_entry(s, &slab_caches, list) {
 		n = get_node(s, offline_node);
@@ -3611,6 +3614,9 @@ static int slab_mem_going_online_callback(void *arg)
 	if (nid < 0)
 		return 0;
 
+	if (page_zonenum(pfn_to_page(marg->start_pfn)) > ZONE_NORMAL)
+		return 0;
+
 	/*
 	 * We are bringing a node online. No memory is available yet. We must
 	 * allocate a kmem_cache_node structure in order to bring the node
-- 
1.7.1

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