Re: [Patch v4 12/12] memory-hotplug: free node_data when a node is offlined
From: Tang Chen <hidden>
Date: 2012-12-04 10:11:19
Also in:
linux-acpi, linux-mm, linux-s390, linux-sh, lkml, sparclinux
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@google.com> CC: Jiang Liu<redacted> CC: Len Brown<redacted> CC: Benjamin Herrenschmidt<benh@kernel.crashing.org> CC: Paul Mackerras<redacted> CC: Christoph Lameter<redacted> Cc: Minchan Kim<redacted> CC: Andrew Morton<akpm@linux-foundation.org> CC: KOSAKI Motohiro<redacted> CC: Yasuaki Ishimatsu<redacted> Signed-off-by: Wen Congyang<redacted>
Reviewed-by: Tang Chen <redacted>
quoted hunk ↗ jump to hunk
--- 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)