linux-kernel - [PATCH 2/3] slub, hotplug: ignore unrelated node's hot-adding and hot-removing

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Date:	Thu, 27 Sep 2012 14:47:49 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	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: [PATCH 2/3] 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.

Aka: if some memroy of a node(which has no onlined memory) is online,
but this new memory onlined is not normal memory(HIGH memory example),
we should not allocate kmem_cache_node for SLUB.

And if the last normal memory is offlined, but the node still has memroy,
we should remove kmem_cache_node for that node.(current code delay it when
all of the memory is offlined)

so we only do something when marg->status_change_nid_normal > 0.
marg->status_change_nid is not suitable here.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 mm/slub.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 2fdd96f..2d78639 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3577,7 +3577,7 @@ static void slab_mem_offline_callback(void *arg)
 	struct memory_notify *marg = arg;
 	int offline_node;
 
-	offline_node = marg->status_change_nid;
+	offline_node = marg->status_change_nid_normal;
 
 	/*
 	 * If the node still has available memory. we need kmem_cache_node
@@ -3610,7 +3610,7 @@ static int slab_mem_going_online_callback(void *arg)
 	struct kmem_cache_node *n;
 	struct kmem_cache *s;
 	struct memory_notify *marg = arg;
-	int nid = marg->status_change_nid;
+	int nid = marg->status_change_nid_normal;
 	int ret = 0;
 
 	/*
-- 
1.7.4.4

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