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68ae564)
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>
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
#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),
};
[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
};
#ifdef CONFIG_HIGHMEM
&node_state_attr[N_HIGH_MEMORY].attr.attr,
#endif
#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
};
&node_state_attr[N_CPU].attr.attr,
NULL
};
#else
N_HIGH_MEMORY = N_NORMAL_MEMORY,
#endif
#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,
N_MEMORY = N_HIGH_MEMORY,
N_CPU, /* The node has one or more cpus */
NR_NODE_STATES
};
N_CPU, /* The node has one or more cpus */
NR_NODE_STATES
};
config MEMORY_ISOLATION
boolean
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"
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
+#ifdef CONFIG_MOVABLE_NODE
+ [N_MEMORY] = { { [0] = 1UL } },
+#endif
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};