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Message-Id: <1350988250-31294-13-git-send-email-wency@cn.fujitsu.com>
Date: Tue, 23 Oct 2012 18:30:50 +0800
From: wency@...fujitsu.com
To: x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
linux-ia64@...r.kernel.org, cmetcalf@...era.com,
sparclinux@...r.kernel.org
Cc: rientjes@...gle.com, liuj97@...il.com, len.brown@...el.com,
benh@...nel.crashing.org, paulus@...ba.org, cl@...ux.com,
minchan.kim@...il.com, akpm@...ux-foundation.org,
kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
Wen Congyang <wency@...fujitsu.com>
Subject: [PATCH v2 12/12] memory-hotplug: free node_data when a node is offlined
From: Wen Congyang <wency@...fujitsu.com>
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@...gle.com>
CC: Jiang Liu <liuj97@...il.com>
CC: Len Brown <len.brown@...el.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Christoph Lameter <cl@...ux.com>
Cc: Minchan Kim <minchan.kim@...il.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Signed-off-by: Wen Congyang <wency@...fujitsu.com>
---
mm/memory_hotplug.c | 20 +++++++++++++++++++-
1 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b1fe41d..6b4cd53 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1320,9 +1320,12 @@ 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);
@@ -1349,6 +1352,21 @@ 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)
--
1.7.1
--
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