linux-kernel - Re: [patch 2/2] mm: memcg: count pte references from every member of the reclaimed hierarchy

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Date:	Fri, 27 Apr 2012 10:10:21 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] mm: memcg: count pte references from every member of
 the reclaimed hierarchy

On Fri 27-04-12 01:48:19, Johannes Weiner wrote:
[...]
> From: Johannes Weiner <hannes@...xchg.org>
> Subject: [patch] mm: memcg: clean up mm_match_cgroup() signature
> 
> It really should return a boolean for match/no match.  And since it
> takes a memcg, not a cgroup, fix that parameter name as well.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

> ---
>  include/linux/memcontrol.h |   14 +++++++-------
>  1 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 76f9d9b..d3038a9 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -89,14 +89,14 @@ extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
>  extern struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont);
>  
>  static inline
> -int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
> +bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
>  {
> -	struct mem_cgroup *memcg;
> -	int match;
> +	struct mem_cgroup *task_memcg;
> +	bool match;
>  
>  	rcu_read_lock();
> -	memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
> -	match = memcg && __mem_cgroup_same_or_subtree(cgroup, memcg);
> +	task_memcg = mem_cgroup_from_task(rcu_dereference((mm)->owner));
> +	match = task_memcg && __mem_cgroup_same_or_subtree(memcg, task_memcg);
>  	rcu_read_unlock();
>  	return match;
>  }
> @@ -281,10 +281,10 @@ static inline struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm
>  	return NULL;
>  }
>  
> -static inline int mm_match_cgroup(struct mm_struct *mm,
> +static inline bool mm_match_cgroup(struct mm_struct *mm,
>  		struct mem_cgroup *memcg)
>  {
> -	return 1;
> +	return true;
>  }
>  
>  static inline int task_in_mem_cgroup(struct task_struct *task,
> -- 
> 1.7.7.6
> 
> --
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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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