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authorLai Jiangshan <laijs@cn.fujitsu.com>2012-12-12 13:52:00 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 17:38:34 -0800
commit20b2f52b73febce476fc9376f0296c1aa0e4f5a7 (patch)
tree037d74ec3666d3dfc7c235c7b59b11ed9b29d3b4
parent68ae564bbac8eb9ed54ddd2529b0e29ee190b355 (diff)
numa: add CONFIG_MOVABLE_NODE for movable-dedicated node
We need a node which only contains movable memory. This feature is very important for node hotplug. If a node has normal/highmem, the memory may be used by the kernel and can't be offlined. If the node only contains movable memory, we can offline the memory and the node. All are prepared, we can actually introduce N_MEMORY. add CONFIG_MOVABLE_NODE make we can use it for movable-dedicated node [akpm@linux-foundation.org: fix Kconfig text] Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Mel Gorman <mgorman@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/base/node.c6
-rw-r--r--include/linux/nodemask.h4
-rw-r--r--mm/Kconfig8
-rw-r--r--mm/page_alloc.c3
4 files changed, 21 insertions, 0 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 49dbe7dc9ada..fac124a7e1c5 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -644,6 +644,9 @@ static struct node_attr node_state_attr[] = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
+#ifdef CONFIG_MOVABLE_NODE
+ [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
+#endif
[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
};
@@ -654,6 +657,9 @@ static struct attribute *node_state_attrs[] = {
#ifdef CONFIG_HIGHMEM
&node_state_attr[N_HIGH_MEMORY].attr.attr,
#endif
+#ifdef CONFIG_MOVABLE_NODE
+ &node_state_attr[N_MEMORY].attr.attr,
+#endif
&node_state_attr[N_CPU].attr.attr,
NULL
};
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index c6ebdc97a428..4e2cbfa640b7 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -380,7 +380,11 @@ enum node_states {
#else
N_HIGH_MEMORY = N_NORMAL_MEMORY,
#endif
+#ifdef CONFIG_MOVABLE_NODE
+ N_MEMORY, /* The node has memory(regular, high, movable) */
+#else
N_MEMORY = N_HIGH_MEMORY,
+#endif
N_CPU, /* The node has one or more cpus */
NR_NODE_STATES
};
diff --git a/mm/Kconfig b/mm/Kconfig
index e6651c5de14f..1680a0123a13 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -143,6 +143,14 @@ config NO_BOOTMEM
config MEMORY_ISOLATION
boolean
+config MOVABLE_NODE
+ boolean "Enable to assign a node which has only movable memory"
+ depends on HAVE_MEMBLOCK
+ depends on NO_BOOTMEM
+ depends on X86_64
+ depends on NUMA
+ default y
+
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 35727168896b..2bf0d43d646b 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -90,6 +90,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
+#ifdef CONFIG_MOVABLE_NODE
+ [N_MEMORY] = { { [0] = 1UL } },
+#endif
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};