linux-kernel - Re: [PATCH] mm: memcg: keep root group unchanged if fail to create new

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Date:	Mon, 12 Dec 2011 15:07:50 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Hugh Dickins <hughd@...gle.com>,
	Balbir Singh <bsingharora@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcg: keep root group unchanged if fail to create
 new

On Mon 12-12-11 21:49:18, Hillf Danton wrote:
[...]
> From: Hillf Danton <dhillf@...il.com>
> Subject: [PATCH] mm: memcg: keep root group unchanged if fail to create new
> 
> If the request is to create non-root group and we fail to meet it, we should
> leave the root unchanged.
> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>
> Acked-by: Hugh Dickins <hughd@...gle.com>
> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Acked-by: Michal Hocko <mhocko@...e.cz>

Thanks
> ---
> 
> --- a/mm/memcontrol.c	Fri Dec  9 21:57:40 2011
> +++ b/mm/memcontrol.c	Mon Dec 12 21:47:14 2011
> @@ -4848,9 +4848,9 @@ mem_cgroup_create(struct cgroup_subsys *
>  		int cpu;
>  		enable_swap_cgroup();
>  		parent = NULL;
> -		root_mem_cgroup = memcg;
>  		if (mem_cgroup_soft_limit_tree_init())
>  			goto free_out;
> +		root_mem_cgroup = memcg;
>  		for_each_possible_cpu(cpu) {
>  			struct memcg_stock_pcp *stock =
>  						&per_cpu(memcg_stock, cpu);
> @@ -4888,7 +4888,6 @@ mem_cgroup_create(struct cgroup_subsys *
>  	return &memcg->css;
>  free_out:
>  	__mem_cgroup_free(memcg);
> -	root_mem_cgroup = NULL;
>  	return ERR_PTR(error);
>  }
> 
> --
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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