[PATCH] mm/memcg: remove redundant checking on root memcg

From: Wanpeng Li
Date: Tue Jul 17 2012 - 05:43:11 EST

Function __mem_cgroup_cancel_local_charge is only called by
mem_cgroup_move_parent. For this case, root memcg has been
checked by mem_cgroup_move_parent. So we needn't check that
again in function __mem_cgroup_cancel_local_charge and just
remove the check in function __mem_cgroup_cancel_local_charge.

Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
mm/memcontrol.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6392c0a..d346347 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2404,9 +2404,6 @@ static void __mem_cgroup_cancel_local_charge(struct mem_cgroup *memcg,
unsigned long bytes = nr_pages * PAGE_SIZE;

- if (mem_cgroup_is_root(memcg))
- return;
res_counter_uncharge_until(&memcg->res, memcg->res.parent, bytes);
if (do_swap_account)

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/