On 11/27/2012 06:00 PM, Wen Congyang wrote:
We call hotadd_new_pgdat() to allocate memory to store node_data. So we
should free it when removing a node.
CC: David Rientjes<rientjes@xxxxxxxxxx>
CC: Jiang Liu<liuj97@xxxxxxxxx>
CC: Len Brown<len.brown@xxxxxxxxx>
CC: Benjamin Herrenschmidt<benh@xxxxxxxxxxxxxxxxxxx>
CC: Paul Mackerras<paulus@xxxxxxxxx>
CC: Christoph Lameter<cl@xxxxxxxxx>
Cc: Minchan Kim<minchan.kim@xxxxxxxxx>
CC: Andrew Morton<akpm@xxxxxxxxxxxxxxxxxxxx>
CC: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx>
CC: Yasuaki Ishimatsu<isimatu.yasuaki@xxxxxxxxxxxxxx>
Signed-off-by: Wen Congyang<wency@xxxxxxxxxxxxxx>
Reviewed-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 449663e..d1451ab 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1309,9 +1309,12 @@ 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)
{
+ pg_data_t *pgdat = NODE_DATA(nid);
unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
- unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages;
+ 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);
@@ -1338,6 +1341,21 @@ 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);
+ }
+
+ arch_refresh_nodedata(nid, NULL);
+ arch_free_nodedata(pgdat);
}
int __ref remove_memory(int nid, u64 start, u64 size)
--
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