linux-kernel - Re: [PATCH 2/2] memcg: clean up force_empty

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Date:	Mon, 18 Jun 2012 15:31:50 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	cgroups@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 2/2] memcg: clean up force_empty_list() return value check

On Mon 18-06-12 20:59:44, KAMEZAWA Hiroyuki wrote:
> 
> By commit "memcg: move charges to root cgroup if use_hierarchy=0"
> mem_cgroup_move_parent() only returns -EBUSY, -EINVAL.
> So, we can remove -ENOMEM and -EINTR checks.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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

> ---
>  mm/memcontrol.c |    5 -----
>  1 files changed, 0 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index cf8a0f6..726b7c6 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3847,8 +3847,6 @@ static int mem_cgroup_force_empty_list(struct mem_cgroup *memcg,
>  		pc = lookup_page_cgroup(page);
>  
>  		ret = mem_cgroup_move_parent(page, pc, memcg, GFP_KERNEL);
> -		if (ret == -ENOMEM || ret == -EINTR)
> -			break;
>  
>  		if (ret == -EBUSY || ret == -EINVAL) {
>  			/* found lock contention or "pc" is obsolete. */
> @@ -3910,9 +3908,6 @@ move_account:
>  		}
>  		mem_cgroup_end_move(memcg);
>  		memcg_oom_recover(memcg);
> -		/* it seems parent cgroup doesn't have enough mem */
> -		if (ret == -ENOMEM)
> -			goto try_to_free;
>  		cond_resched();
>  	/* "ret" should also be checked to ensure all lists are empty. */
>  	} while (res_counter_read_u64(&memcg->res, RES_USAGE) > 0 || ret);
> -- 
> 1.7.4.1
> 
> 
> --
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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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