linux-kernel - Re: [PATCH v2 03/13] memcg: Uncharge all kmem when deleting a cgroup.

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Date:	Sun, 11 Mar 2012 12:19:55 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Suleiman Souhlal <ssouhlal@...eBSD.org>
CC:	<cgroups@...r.kernel.org>, <suleiman@...gle.com>,
	<kamezawa.hiroyu@...fujitsu.com>, <penberg@...nel.org>,
	<cl@...ux.com>, <yinghan@...gle.com>, <hughd@...gle.com>,
	<gthelen@...gle.com>, <peterz@...radead.org>,
	<dan.magenheimer@...cle.com>, <hannes@...xchg.org>,
	<mgorman@...e.de>, <James.Bottomley@...senPartnership.com>,
	<linux-mm@...ck.org>, <devel@...nvz.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/13] memcg: Uncharge all kmem when deleting a cgroup.

On 03/10/2012 12:39 AM, Suleiman Souhlal wrote:
> Signed-off-by: Suleiman Souhlal<suleiman@...gle.com>
> ---
>   mm/memcontrol.c |   31 ++++++++++++++++++++++++++++++-
>   1 files changed, 30 insertions(+), 1 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e6fd558..6fbb438 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -382,6 +382,7 @@ static void mem_cgroup_get(struct mem_cgroup *memcg);
>   static void mem_cgroup_put(struct mem_cgroup *memcg);
>   static void memcg_kmem_init(struct mem_cgroup *memcg,
>       struct mem_cgroup *parent);
> +static void memcg_kmem_move(struct mem_cgroup *memcg);
>
>   static inline bool
>   mem_cgroup_test_flag(const struct mem_cgroup *memcg, enum memcg_flags flag)
> @@ -3700,6 +3701,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg, bool free_all)
>   	int ret;
>   	int node, zid, shrink;
>   	int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
> +	unsigned long usage;
>   	struct cgroup *cgrp = memcg->css.cgroup;
>
>   	css_get(&memcg->css);
> @@ -3719,6 +3721,8 @@ move_account:
>   		/* This is for making all *used* pages to be on LRU. */
>   		lru_add_drain_all();
>   		drain_all_stock_sync(memcg);
> +		if (!free_all)
> +			memcg_kmem_move(memcg);
Any reason we're not moving kmem charges when free_all is set as well?
--
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