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memory_hotplug: allow online/offline memory to result movable node

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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: 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>
This commit is contained in:
Lai Jiangshan 2012-12-12 13:52:04 -08:00 committed by Linus Torvalds
parent 20b2f52b73
commit 09285af75d
1 changed files with 16 additions and 0 deletions
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16
mm/memory_hotplug.c
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@ -581,11 +581,19 @@ static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
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 */
static bool can_online_high_movable(struct zone *zone)
{
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 */
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;
}
#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 */
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;
}
#endif /* #ifdef CONFIG_MOVABLE_NODE */
/* check which state of node_states will be changed when offline memory */
static void node_states_check_changes_offline(unsigned long nr_pages,