linux-kernel - Re: [PATCH 2/7] memcg: mem_cgroup_shrink_node

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Date:	Thu, 22 Jul 2010 10:19:12 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: [PATCH 2/7] memcg: mem_cgroup_shrink_node_zone() doesn't need
 sc.nodemask

* KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> [2010-07-16 19:14:15]:

> Currently mem_cgroup_shrink_node_zone() call shrink_zone() directly.
> thus it doesn't need to initialize sc.nodemask. shrink_zone() doesn't
> use it at all.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  include/linux/swap.h |    3 +--
>  mm/memcontrol.c      |    3 +--
>  mm/vmscan.c          |    8 ++------
>  3 files changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index ff4acea..bf4eb62 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -244,8 +244,7 @@ extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
>  extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
>  						gfp_t gfp_mask, bool noswap,
>  						unsigned int swappiness,
> -						struct zone *zone,
> -						int nid);
> +						struct zone *zone);
>  extern int __isolate_lru_page(struct page *page, int mode, int file);
>  extern unsigned long shrink_all_memory(unsigned long nr_pages);
>  extern int vm_swappiness;
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index aba4310..01f38ff 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -1307,8 +1307,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
>  		/* we use swappiness of local cgroup */
>  		if (check_soft)
>  			ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
> -				noswap, get_swappiness(victim), zone,
> -				zone->zone_pgdat->node_id);
> +				noswap, get_swappiness(victim), zone);
>  		else
>  			ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
>  						noswap, get_swappiness(victim));
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index bd1d035..be860a0 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1929,7 +1929,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
>  unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
>  						gfp_t gfp_mask, bool noswap,
>  						unsigned int swappiness,
> -						struct zone *zone, int nid)
> +						struct zone *zone)
>  {
>  	struct scan_control sc = {
>  		.nr_to_reclaim = SWAP_CLUSTER_MAX,
> @@ -1940,13 +1940,9 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
>  		.order = 0,
>  		.mem_cgroup = mem,
>  	};
> -	nodemask_t nm  = nodemask_of_node(nid);
> -
>  	sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
>  			(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
> -	sc.nodemask = &nm;
> -	sc.nr_reclaimed = 0;
> -	sc.nr_scanned = 0;

We need the initialization to 0, is there a reason why it was removed?
What happens when we compare or increment sc.nr_*?

Can we keep this indepedent of the tracing patches?

> +
>  	/*
>  	 * NOTE: Although we can get the priority field, using it
>  	 * here is not a good idea, since it limits the pages we can scan.
> -- 
> 1.6.5.2
> 
> 
> 
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-- 
	Three Cheers,
	Balbir
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