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memory-hotplug: free node_data when a node is offlined

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We call hotadd_new_pgdat() to allocate memory to store node_data.  So we
should free it when removing a node.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wen Congyang 2013-02-22 16:33:16 -08:00 committed by Linus Torvalds
parent 60a5a19e74
commit d822b86a99
1 changed files with 27 additions and 3 deletions
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30
mm/memory_hotplug.c
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@ -1700,9 +1700,12 @@ static int check_cpu_on_node(void *data)
/* offline the node if all memory sections of this node are removed */
static void try_offline_node(int nid)
{
unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long start_pfn = pgdat->node_start_pfn;
unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
unsigned long pfn;
struct page *pgdat_page = virt_to_page(pgdat);
int i;
for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
unsigned long section_nr = pfn_to_section_nr(pfn);
@ -1720,7 +1723,7 @@ static void try_offline_node(int nid)
return;
}
if (stop_machine(check_cpu_on_node, NODE_DATA(nid), NULL))
if (stop_machine(check_cpu_on_node, pgdat, NULL))
return;
/*
@ -1729,6 +1732,27 @@ static void try_offline_node(int nid)
*/
node_set_offline(nid);
unregister_one_node(nid);
if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page))
/* node data is allocated from boot memory */
return;
/* free waittable in each zone */
for (i = 0; i < MAX_NR_ZONES; i++) {
struct zone *zone = pgdat->node_zones + i;
if (zone->wait_table)
vfree(zone->wait_table);
}
/*
* Since there is no way to guarentee the address of pgdat/zone is not
* on stack of any kernel threads or used by other kernel objects
* without reference counting or other symchronizing method, do not
* reset node_data and free pgdat here. Just reset it to 0 and reuse
* the memory when the node is online again.
*/
memset(pgdat, 0, sizeof(*pgdat));
}
int __ref remove_memory(int nid, u64 start, u64 size)