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authorJohannes Weiner <hannes@cmpxchg.org>2011-03-23 16:42:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:28 -0700
commit6b3ae58efca06623c197fd6d91ded4aa3a8fe039 (patch)
tree6460e4e1ce206d391b862a3d398a9e22e33ecb3c /mm/memcontrol.c
parent5564e88ba6fd2f6dcd83a592771810cd84b5ae80 (diff)
memcg: remove direct page_cgroup-to-page pointer
In struct page_cgroup, we have a full word for flags but only a few are reserved. Use the remaining upper bits to encode, depending on configuration, the node or the section, to enable page_cgroup-to-page lookups without a direct pointer. This saves a full word for every page in a system with memory cgroups enabled. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e286e1603e4f..660dfc27d971 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1080,7 +1080,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
if (unlikely(!PageCgroupUsed(pc)))
continue;
- page = pc->page;
+ page = lookup_cgroup_page(pc);
if (unlikely(!PageLRU(page)))
continue;
@@ -3344,7 +3344,7 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *mem,
}
spin_unlock_irqrestore(&zone->lru_lock, flags);
- page = pc->page;
+ page = lookup_cgroup_page(pc);
ret = mem_cgroup_move_parent(page, pc, mem, GFP_KERNEL);
if (ret == -ENOMEM)