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authorWen Congyang <wency@cn.fujitsu.com>2012-12-12 04:01:01 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 05:22:23 +0400
commit6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b (patch)
treee2cc08839a13745a21ade3d5ab22d8f8836ace80
parent3ac19f8efe26451cacac31d0be34fa9c51114c2a (diff)
downloadlinux-6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b.tar.xz
memory-hotplug: allocate zone's pcp before onlining pages
We use __free_page() to put a page to buddy system when onlining pages. __free_page() will store NR_FREE_PAGES in zone's pcp.vm_stat_diff, so we should allocate zone's pcp before onlining pages, otherwise we will lose some free pages. [mhocko@suse.cz: make zone_pcp_reset independent of MEMORY_HOTREMOVE] Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Cc: David Rientjes <rientjes@google.com> Cc: Jiang Liu <liuj97@gmail.com> Cc: Len Brown <len.brown@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Christoph Lameter <cl@linux.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory_hotplug.c8
-rw-r--r--mm/page_alloc.c2
2 files changed, 7 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 0095d156324a..ec2f199cc5f7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -498,12 +498,16 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
* So, zonelist must be updated after online.
*/
mutex_lock(&zonelists_mutex);
- if (!populated_zone(zone))
+ if (!populated_zone(zone)) {
need_zonelists_rebuild = 1;
+ build_all_zonelists(NULL, zone);
+ }
ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range);
if (ret) {
+ if (need_zonelists_rebuild)
+ zone_pcp_reset(zone);
mutex_unlock(&zonelists_mutex);
printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
(unsigned long long) pfn << PAGE_SHIFT,
@@ -519,7 +523,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
if (onlined_pages) {
node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
if (need_zonelists_rebuild)
- build_all_zonelists(NULL, zone);
+ build_all_zonelists(NULL, NULL);
else
zone_pcp_update(zone);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4dba04f06880..5a7b7611d4e4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5983,7 +5983,6 @@ void __meminit zone_pcp_update(struct zone *zone)
}
#endif
-#ifdef CONFIG_MEMORY_HOTREMOVE
void zone_pcp_reset(struct zone *zone)
{
unsigned long flags;
@@ -6003,6 +6002,7 @@ void zone_pcp_reset(struct zone *zone)
local_irq_restore(flags);
}
+#ifdef CONFIG_MEMORY_HOTREMOVE
/*
* All pages in the range must be isolated before calling this.
*/