linux-kernel - Re: [PATCH v3 19/21] memcg: check lru vectors emptiness in pre-destroy

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Message-Id: <20120228104331.37f9bcfd.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 28 Feb 2012 10:43:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 19/21] memcg: check lru vectors emptiness in
 pre-destroy

On Thu, 23 Feb 2012 17:53:19 +0400
Konstantin Khlebnikov <khlebnikov@...nvz.org> wrote:

> We must abort cgroup destroying if it still not empty,
> resource counter cannot catch isolated uncharged pages.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>

I like this. 
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtisu.com>

> ---
>  mm/memcontrol.c |   10 +++++++++-
>  1 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 4de8044..fbeff85 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4859,8 +4859,16 @@ free_out:
>  static int mem_cgroup_pre_destroy(struct cgroup *cont)
>  {
>  	struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
> +	int ret;
> +
> +	ret = mem_cgroup_force_empty(memcg, false);
> +	if (ret)
> +		return ret;
>  
> -	return mem_cgroup_force_empty(memcg, false);
> +	if (mem_cgroup_nr_lru_pages(memcg, -1))
> +		return -EBUSY;
> +
> +	return 0;
>  }
>  
>  static void mem_cgroup_destroy(struct cgroup *cont)
> 
> --
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