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| author | Wen Congyang <wency@cn.fujitsu.com> | 2012-12-12 04:01:01 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 05:22:23 +0400 |
| commit | 6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b (patch) | |
| tree | e2cc08839a13745a21ade3d5ab22d8f8836ace80 | |
| parent | 3ac19f8efe26451cacac31d0be34fa9c51114c2a (diff) | |
| download | linux-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.c | 8 | ||||
| -rw-r--r-- | mm/page_alloc.c | 2 |
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. */ |