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authorJiang Liu <jiang.liu@huawei.com>2012-07-31 16:43:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:44 -0700
commit9adb62a5df9c0fbef7b4665919329f73a34651ed (patch)
tree8372c9c1202adac889714ea99319346279107f33
parentda92c47d069890106484cb6605df701a54d24499 (diff)
downloadlinux-linaro-stable-9adb62a5df9c0fbef7b4665919329f73a34651ed.tar.gz
mm/hotplug: correctly setup fallback zonelists when creating new pgdat
When hotadd_new_pgdat() is called to create new pgdat for a new node, a fallback zonelist should be created for the new node. There's code to try to achieve that in hotadd_new_pgdat() as below: /* * The node we allocated has no zone fallback lists. For avoiding * to access not-initialized zonelist, build here. */ mutex_lock(&zonelists_mutex); build_all_zonelists(pgdat, NULL); mutex_unlock(&zonelists_mutex); But it doesn't work as expected. When hotadd_new_pgdat() is called, the new node is still in offline state because node_set_online(nid) hasn't been called yet. And build_all_zonelists() only builds zonelists for online nodes as: for_each_online_node(nid) { pg_data_t *pgdat = NODE_DATA(nid); build_zonelists(pgdat); build_zonelist_cache(pgdat); } Though we hope to create zonelist for the new pgdat, but it doesn't. So add a new parameter "pgdat" the build_all_zonelists() to build pgdat for the new pgdat too. Signed-off-by: Jiang Liu <liuj97@gmail.com> Signed-off-by: Xishi Qiu <qiuxishi@huawei.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Hocko <mhocko@suse.cz> Cc: Minchan Kim <minchan@kernel.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Tony Luck <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Keping Chen <chenkeping@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mmzone.h2
-rw-r--r--init/main.c2
-rw-r--r--kernel/cpu.c2
-rw-r--r--mm/memory_hotplug.c4
-rw-r--r--mm/page_alloc.c17
5 files changed, 17 insertions, 10 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f64afa5929fe..98f079bcf399 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -721,7 +721,7 @@ typedef struct pglist_data {
#include <linux/memory_hotplug.h>
extern struct mutex zonelists_mutex;
-void build_all_zonelists(void *data);
+void build_all_zonelists(pg_data_t *pgdat, struct zone *zone);
void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx);
bool zone_watermark_ok(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags);
diff --git a/init/main.c b/init/main.c
index 95316a1b4a76..e60679de61c3 100644
--- a/init/main.c
+++ b/init/main.c
@@ -506,7 +506,7 @@ asmlinkage void __init start_kernel(void)
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
- build_all_zonelists(NULL);
+ build_all_zonelists(NULL, NULL);
page_alloc_init();
printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index a4eb5227a19e..14d32588cccd 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -416,7 +416,7 @@ int __cpuinit cpu_up(unsigned int cpu)
if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
mutex_lock(&zonelists_mutex);
- build_all_zonelists(NULL);
+ build_all_zonelists(NULL, NULL);
mutex_unlock(&zonelists_mutex);
}
#endif
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 427bb291dd0f..b8731040b9f9 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -513,7 +513,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
zone->present_pages += onlined_pages;
zone->zone_pgdat->node_present_pages += onlined_pages;
if (need_zonelists_rebuild)
- build_all_zonelists(zone);
+ build_all_zonelists(NULL, zone);
else
zone_pcp_update(zone);
@@ -562,7 +562,7 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
* to access not-initialized zonelist, build here.
*/
mutex_lock(&zonelists_mutex);
- build_all_zonelists(NULL);
+ build_all_zonelists(pgdat, NULL);
mutex_unlock(&zonelists_mutex);
return pgdat;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6c7e3bd93a85..9ad6866ac49c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3032,7 +3032,7 @@ int numa_zonelist_order_handler(ctl_table *table, int write,
user_zonelist_order = oldval;
} else if (oldval != user_zonelist_order) {
mutex_lock(&zonelists_mutex);
- build_all_zonelists(NULL);
+ build_all_zonelists(NULL, NULL);
mutex_unlock(&zonelists_mutex);
}
}
@@ -3415,10 +3415,17 @@ static __init_refok int __build_all_zonelists(void *data)
{
int nid;
int cpu;
+ pg_data_t *self = data;
#ifdef CONFIG_NUMA
memset(node_load, 0, sizeof(node_load));
#endif
+
+ if (self && !node_online(self->node_id)) {
+ build_zonelists(self);
+ build_zonelist_cache(self);
+ }
+
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
@@ -3463,7 +3470,7 @@ static __init_refok int __build_all_zonelists(void *data)
* Called with zonelists_mutex held always
* unless system_state == SYSTEM_BOOTING.
*/
-void __ref build_all_zonelists(void *data)
+void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone)
{
set_zonelist_order();
@@ -3475,10 +3482,10 @@ void __ref build_all_zonelists(void *data)
/* we have to stop all cpus to guarantee there is no user
of zonelist */
#ifdef CONFIG_MEMORY_HOTPLUG
- if (data)
- setup_zone_pageset((struct zone *)data);
+ if (zone)
+ setup_zone_pageset(zone);
#endif
- stop_machine(__build_all_zonelists, NULL, NULL);
+ stop_machine(__build_all_zonelists, pgdat, NULL);
/* cpuset refresh routine should be here */
}
vm_total_pages = nr_free_pagecache_pages();