linux-kernel - Re: [PATCH v2 3/7] mm: memcontrol: replace mem_cgroup_lruvec_online with mem_cgroup

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Message-ID: <20160113164733.GG17512@dhcp22.suse.cz>
Date:	Wed, 13 Jan 2016 17:47:36 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] mm: memcontrol: replace mem_cgroup_lruvec_online
 with mem_cgroup_online

On Thu 17-12-15 15:29:56, Vladimir Davydov wrote:
> mem_cgroup_lruvec_online() takes lruvec, but it only needs memcg. Since
> get_scan_count(), which is the only user of this function, now possesses
> pointer to memcg, let's pass memcg directly to mem_cgroup_online()
> instead of picking it out of lruvec and rename the function accordingly.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>

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

> ---
>  include/linux/memcontrol.h | 27 ++++++++++-----------------
>  mm/vmscan.c                |  2 +-
>  2 files changed, 11 insertions(+), 18 deletions(-)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 6e0126230878..166661708410 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -355,6 +355,13 @@ static inline bool mem_cgroup_disabled(void)
>  	return !cgroup_subsys_enabled(memory_cgrp_subsys);
>  }
>  
> +static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
> +{
> +	if (mem_cgroup_disabled())
> +		return true;
> +	return !!(memcg->css.flags & CSS_ONLINE);
> +}
> +
>  /*
>   * For memory reclaim.
>   */
> @@ -363,20 +370,6 @@ int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
>  void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
>  		int nr_pages);
>  
> -static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
> -{
> -	struct mem_cgroup_per_zone *mz;
> -	struct mem_cgroup *memcg;
> -
> -	if (mem_cgroup_disabled())
> -		return true;
> -
> -	mz = container_of(lruvec, struct mem_cgroup_per_zone, lruvec);
> -	memcg = mz->memcg;
> -
> -	return !!(memcg->css.flags & CSS_ONLINE);
> -}
> -
>  static inline
>  unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
>  {
> @@ -589,13 +582,13 @@ static inline bool mem_cgroup_disabled(void)
>  	return true;
>  }
>  
> -static inline bool
> -mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
> +static inline bool mem_cgroup_online(struct mem_cgroup *memcg)
>  {
>  	return true;
>  }
>  
> -static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
> +static inline bool
> +mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
>  {
>  	return true;
>  }
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index acc6bff84e26..b220e6cda25d 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1988,7 +1988,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg,
>  	if (current_is_kswapd()) {
>  		if (!zone_reclaimable(zone))
>  			force_scan = true;
> -		if (!mem_cgroup_lruvec_online(lruvec))
> +		if (!mem_cgroup_online(memcg))
>  			force_scan = true;
>  	}
>  	if (!global_reclaim(sc))
> -- 
> 2.1.4
> 
> --
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-- 
Michal Hocko
SUSE Labs