linux-kernel - Re: [PATCH 5/6] memcg: optimize memcg_get_hierarchical

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Date:	Mon, 25 Jun 2012 12:14:35 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Wanpeng Li <liwp.linux@...il.com>
CC:	<linux-mm@...ck.org>, Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <bsingharora@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Minchan Kim <minchan@...nel.org>,
	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	Gavin Shan <shangw@...ux.vnet.ibm.com>
Subject: Re: [PATCH 5/6] memcg: optimize memcg_get_hierarchical_limit

On 06/23/2012 10:18 AM, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>
> Optimize memcg_get_hierarchical_limit to save cpu cycle.
>
> Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
> ---
>   mm/memcontrol.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index c821e36..1ca79e2 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3917,9 +3917,9 @@ static void memcg_get_hierarchical_limit(struct mem_cgroup *memcg,
>
>   	min_limit = res_counter_read_u64(&memcg->res, RES_LIMIT);
>   	min_memsw_limit = res_counter_read_u64(&memcg->memsw, RES_LIMIT);
> -	cgroup = memcg->css.cgroup;
>   	if (!memcg->use_hierarchy)
>   		goto out;
> +	cgroup = memcg->css.cgroup;
>
>   	while (cgroup->parent) {
>   		cgroup = cgroup->parent;
>
Seriously, this saves nothing.


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