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Commit 09285af7 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Linus Torvalds
Browse files

memory_hotplug: allow online/offline memory to result movable node 



Now, memory management can handle movable node or nodes which don't have
any normal memory, so we can dynamic configure and add movable node by:

	online a ZONE_MOVABLE memory from a previous offline node
	offline the last normal memory which result a non-normal-memory-node

movable-node is very important for power-saving, hardware partitioning and
high-available-system(hardware fault management).

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 20b2f52b

mm/memory_hotplug.c

+16 −0
Original line number Original line Diff line number Diff line
@@ -581,11 +581,19 @@ static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, 
	return 0;

	return 0;

}

}





#ifdef CONFIG_MOVABLE_NODE

/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */

static bool can_online_high_movable(struct zone *zone)

{

	return true;

}

#else /* #ifdef CONFIG_MOVABLE_NODE */

/* ensure every online node has NORMAL memory */

/* ensure every online node has NORMAL memory */

static bool can_online_high_movable(struct zone *zone)

static bool can_online_high_movable(struct zone *zone)

{

{

	return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);

	return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);

}

}

#endif /* #ifdef CONFIG_MOVABLE_NODE */





/* check which state of node_states will be changed when online memory */

/* check which state of node_states will be changed when online memory */

static void node_states_check_changes_online(unsigned long nr_pages,

static void node_states_check_changes_online(unsigned long nr_pages,
@@ -1093,6 +1101,13 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) 
	return offlined;

	return offlined;

}

}





#ifdef CONFIG_MOVABLE_NODE

/* when CONFIG_MOVABLE_NODE, we allow online node don't have normal memory */

static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)

{

	return true;

}

#else /* #ifdef CONFIG_MOVABLE_NODE */

/* ensure the node has NORMAL memory if it is still online */

/* ensure the node has NORMAL memory if it is still online */

static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)

static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)

{

{
@@ -1116,6 +1131,7 @@ static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) 
	 */

	 */

	return present_pages == 0;

	return present_pages == 0;

}

}

#endif /* #ifdef CONFIG_MOVABLE_NODE */





/* check which state of node_states will be changed when offline memory */

/* check which state of node_states will be changed when offline memory */

static void node_states_check_changes_offline(unsigned long nr_pages,

static void node_states_check_changes_offline(unsigned long nr_pages,