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authorLai Jiangshan <laijs@cn.fujitsu.com>2012-12-11 16:01:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 17:22:23 -0800
commitb9d5ab2562eceeada5e4837a621b6260574dd11d (patch)
treed2f984db379ed9d34bc2ce49ff354879ff7da6c4
parentd9713679dbd2a6ecb840cd5b65a3ec555c1ec3d4 (diff)
slub, hotplug: ignore unrelated node's hot-adding and hot-removing
SLUB only focuses on the nodes which have normal memory and it ignores the other node's hot-adding and hot-removing. Aka: if some memory of a node which has no onlined memory is online, but this new memory onlined is not normal memory (for example, highmem), we should not allocate kmem_cache_node for SLUB. And if the last normal memory is offlined, but the node still has memory, we should remove kmem_cache_node for that node. (The current code delays 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. The same problem doesn't exist in SLAB, because SLAB allocates kmem_list3 for every node even the node don't have normal memory, SLAB tolerates kmem_list3 on alien nodes. SLUB only focuses on the nodes which have normal memory, it don't tolerate alien kmem_cache_node. The patch makes SLUB become self-compatible and avoids WARNs and BUGs in rare conditions. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Rob Landley <rob@landley.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Cc: Mel Gorman <mgorman@suse.de> Cc: Wen Congyang <wency@cn.fujitsu.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slub.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c
index a0d698467f7..487f0bdd53c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3573,7 +3573,7 @@ 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
@@ -3606,7 +3606,7 @@ 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;
/*