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authorWen Congyang <wency@cn.fujitsu.com>2012-12-11 16:01:01 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 17:22:23 -0800
commit6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b (patch)
treee2cc08839a13745a21ade3d5ab22d8f8836ace80 /mm/page_alloc.c
parent3ac19f8efe26451cacac31d0be34fa9c51114c2a (diff)
downloadop-kernel-dev-6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b.zip
op-kernel-dev-6dcd73d7011ba9046f9b98e7f7c9d958f5810e6b.tar.gz
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>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4dba04f0..5a7b761 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.
*/
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