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| author | Johannes Weiner <hannes@cmpxchg.org> | 2011-03-23 16:42:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-23 19:46:28 -0700 |
| commit | 6b3ae58efca06623c197fd6d91ded4aa3a8fe039 (patch) | |
| tree | 6460e4e1ce206d391b862a3d398a9e22e33ecb3c /mm/memcontrol.c | |
| parent | 5564e88ba6fd2f6dcd83a592771810cd84b5ae80 (diff) | |
| download | lwn-6b3ae58efca06623c197fd6d91ded4aa3a8fe039.tar.gz lwn-6b3ae58efca06623c197fd6d91ded4aa3a8fe039.zip | |
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.c | 4 |
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) |