Commit 20b2f52b authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Linus Torvalds
Browse files

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: default avatarLai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: default avatarWen 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 68ae564b

drivers/base/node.c

+6 −0
Original line number Diff line number Diff line
@@ -643,6 +643,9 @@ static struct node_attr node_state_attr[] = { 
	[N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY),

#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),

};
@@ -653,6 +656,9 @@ static struct attribute *node_state_attrs[] = { 
	&node_state_attr[N_NORMAL_MEMORY].attr.attr,

#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

include/linux/nodemask.h

+4 −0
Original line number Diff line number Diff line
@@ -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

};

mm/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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"

mm/page_alloc.c

+3 −0
Original line number Diff line number Diff line
@@ -89,6 +89,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = { 
	[N_NORMAL_MEMORY] = { { [0] = 1UL } },

#ifdef CONFIG_HIGHMEM

	[N_HIGH_MEMORY] = { { [0] = 1UL } },

#endif

#ifdef CONFIG_MOVABLE_NODE

	[N_MEMORY] = { { [0] = 1UL } },

#endif

	[N_CPU] = { { [0] = 1UL } },

#endif	/* NUMA */

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