Re: [PATCH 2/7] memcg: move charge to parent only when necessary.

[Tejun Heo <tj@kernel.org>]

On Thu, Apr 12, 2012 at 08:21:20PM +0900, KAMEZAWA Hiroyuki wrote:
> 
> When memcg->use_hierarchy==true, the parent res_counter includes
> the usage in child's usage. So, it's not necessary to call try_charge()
> in the parent.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> ---
>  mm/memcontrol.c |   39 ++++++++++++++++++++++++++++++++-------
>  1 files changed, 32 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index fa01106..3215880 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2409,6 +2409,20 @@ static void __mem_cgroup_cancel_charge(struct mem_cgroup *memcg,
>  			res_counter_uncharge(&memcg->memsw, bytes);
>  	}
>  }

New line missing here.

> +/*
> + * Moving usage between a child to its parent if use_hierarchy==true.
> + */

Prolly "from a child to its parent"?

Thanks.

-- 
tejun

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