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memory-hotplug: allocate zone's pcp before onlining pages

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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>
This commit is contained in:
Wen Congyang 2012-12-11 16:01:01 -08:00 committed by Linus Torvalds
parent 3ac19f8efe
commit 6dcd73d701
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
mm/memory_hotplug.c
View File

@ -498,12 +498,16 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
* So, zonelist must be updated after online. * So, zonelist must be updated after online.
*/ */
mutex_lock(&zonelists_mutex); mutex_lock(&zonelists_mutex);
if (!populated_zone(zone)) if (!populated_zone(zone)) {
need_zonelists_rebuild = 1; need_zonelists_rebuild = 1;
build_all_zonelists(NULL, zone);
}
ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range); online_pages_range);
if (ret) { if (ret) {
if (need_zonelists_rebuild)
zone_pcp_reset(zone);
mutex_unlock(&zonelists_mutex); mutex_unlock(&zonelists_mutex);
printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
(unsigned long long) pfn << PAGE_SHIFT, (unsigned long long) pfn << PAGE_SHIFT,
@ -519,7 +523,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages)
if (onlined_pages) { if (onlined_pages) {
node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
if (need_zonelists_rebuild) if (need_zonelists_rebuild)
build_all_zonelists(NULL, zone); build_all_zonelists(NULL, NULL);
else else
zone_pcp_update(zone); zone_pcp_update(zone);
} }

2
mm/page_alloc.c
View File

@ -5983,7 +5983,6 @@ void __meminit zone_pcp_update(struct zone *zone)
} }
#endif #endif
#ifdef CONFIG_MEMORY_HOTREMOVE
void zone_pcp_reset(struct zone *zone) void zone_pcp_reset(struct zone *zone)
{ {
unsigned long flags; unsigned long flags;
@ -6003,6 +6002,7 @@ void zone_pcp_reset(struct zone *zone)
local_irq_restore(flags); local_irq_restore(flags);
} }
#ifdef CONFIG_MEMORY_HOTREMOVE
/* /*
* All pages in the range must be isolated before calling this. * All pages in the range must be isolated before calling this.
*/ */