linux-kernel - Re: [PATCH 1/7] mm/memcg: scanning_global_lru means mem_cgroup

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Date:	Fri, 2 Mar 2012 14:12:51 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] mm/memcg: scanning_global_lru means
 mem_cgroup_disabled

On Wed, 29 Feb 2012 13:15:39 +0400
Konstantin Khlebnikov <khlebnikov@...nvz.org> wrote:

> From: Hugh Dickins <hughd@...gle.com>
> 
> Although one has to admire the skill with which it has been concealed,
> scanning_global_lru(mz) is actually just an interesting way to test
> mem_cgroup_disabled().  Too many developer hours have been wasted on
> confusing it with global_reclaim(): just use mem_cgroup_disabled().
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>

Acked-by: KAMEZWA Hiroyuki <kamezawa.hiroyu@...fujitu.com>


> ---
>  mm/vmscan.c |   18 ++++--------------
>  1 files changed, 4 insertions(+), 14 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 003b3f5..082fbc2 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -164,26 +164,16 @@ static bool global_reclaim(struct scan_control *sc)
>  {
>  	return !sc->target_mem_cgroup;
>  }
> -
> -static bool scanning_global_lru(struct mem_cgroup_zone *mz)
> -{
> -	return !mz->mem_cgroup;
> -}
>  #else
>  static bool global_reclaim(struct scan_control *sc)
>  {
>  	return true;
>  }
> -
> -static bool scanning_global_lru(struct mem_cgroup_zone *mz)
> -{
> -	return true;
> -}
>  #endif
>  
>  static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
>  {
> -	if (!scanning_global_lru(mz))
> +	if (!mem_cgroup_disabled())
>  		return mem_cgroup_get_reclaim_stat(mz->mem_cgroup, mz->zone);
>  
>  	return &mz->zone->reclaim_stat;
> @@ -192,7 +182,7 @@ static struct zone_reclaim_stat *get_reclaim_stat(struct mem_cgroup_zone *mz)
>  static unsigned long zone_nr_lru_pages(struct mem_cgroup_zone *mz,
>  				       enum lru_list lru)
>  {
> -	if (!scanning_global_lru(mz))
> +	if (!mem_cgroup_disabled())
>  		return mem_cgroup_zone_nr_lru_pages(mz->mem_cgroup,
>  						    zone_to_nid(mz->zone),
>  						    zone_idx(mz->zone),
> @@ -1806,7 +1796,7 @@ static int inactive_anon_is_low(struct mem_cgroup_zone *mz)
>  	if (!total_swap_pages)
>  		return 0;
>  
> -	if (!scanning_global_lru(mz))
> +	if (!mem_cgroup_disabled())
>  		return mem_cgroup_inactive_anon_is_low(mz->mem_cgroup,
>  						       mz->zone);
>  
> @@ -1845,7 +1835,7 @@ static int inactive_file_is_low_global(struct zone *zone)
>   */
>  static int inactive_file_is_low(struct mem_cgroup_zone *mz)
>  {
> -	if (!scanning_global_lru(mz))
> +	if (!mem_cgroup_disabled())
>  		return mem_cgroup_inactive_file_is_low(mz->mem_cgroup,
>  						       mz->zone);
>  
> 
> 

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