linux-kernel - Re: [patch 06/11] mm: memcg: move swapin charge functions above callsites

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Message-ID: <20120709151029.GI4627@tiehlicka.suse.cz>
Date:	Mon, 9 Jul 2012 17:10:30 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 06/11] mm: memcg: move swapin charge functions above
 callsites

On Thu 05-07-12 02:44:58, Johannes Weiner wrote:
> Charging cache pages may require swapin in the shmem case.  Save the
> forward declaration and just move the swapin functions above the cache
> charging functions.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

> ---
>  mm/memcontrol.c |   68 +++++++++++++++++++++++++-----------------------------
>  1 files changed, 32 insertions(+), 36 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3d56b4e..4a41b55 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2729,37 +2729,6 @@ int mem_cgroup_newpage_charge(struct page *page,
>  					MEM_CGROUP_CHARGE_TYPE_ANON);
>  }
>  
> -static void
> -__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
> -					enum charge_type ctype);
> -
> -int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
> -				gfp_t gfp_mask)
> -{
> -	struct mem_cgroup *memcg = NULL;
> -	enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
> -	int ret;
> -
> -	if (mem_cgroup_disabled())
> -		return 0;
> -	if (PageCompound(page))
> -		return 0;
> -
> -	if (unlikely(!mm))
> -		mm = &init_mm;
> -	if (!page_is_file_cache(page))
> -		type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
> -
> -	if (!PageSwapCache(page))
> -		ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
> -	else { /* page is swapcache/shmem */
> -		ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
> -		if (!ret)
> -			__mem_cgroup_commit_charge_swapin(page, memcg, type);
> -	}
> -	return ret;
> -}
> -
>  /*
>   * While swap-in, try_charge -> commit or cancel, the page is locked.
>   * And when try_charge() successfully returns, one refcnt to memcg without
> @@ -2806,6 +2775,15 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
>  	return ret;
>  }
>  
> +void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
> +{
> +	if (mem_cgroup_disabled())
> +		return;
> +	if (!memcg)
> +		return;
> +	__mem_cgroup_cancel_charge(memcg, 1);
> +}
> +
>  static void
>  __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
>  					enum charge_type ctype)
> @@ -2843,13 +2821,31 @@ void mem_cgroup_commit_charge_swapin(struct page *page,
>  					  MEM_CGROUP_CHARGE_TYPE_ANON);
>  }
>  
> -void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *memcg)
> +int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
> +				gfp_t gfp_mask)
>  {
> +	struct mem_cgroup *memcg = NULL;
> +	enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
> +	int ret;
> +
>  	if (mem_cgroup_disabled())
> -		return;
> -	if (!memcg)
> -		return;
> -	__mem_cgroup_cancel_charge(memcg, 1);
> +		return 0;
> +	if (PageCompound(page))
> +		return 0;
> +
> +	if (unlikely(!mm))
> +		mm = &init_mm;
> +	if (!page_is_file_cache(page))
> +		type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
> +
> +	if (!PageSwapCache(page))
> +		ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
> +	else { /* page is swapcache/shmem */
> +		ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &memcg);
> +		if (!ret)
> +			__mem_cgroup_commit_charge_swapin(page, memcg, type);
> +	}
> +	return ret;
>  }
>  
>  static void mem_cgroup_do_uncharge(struct mem_cgroup *memcg,
> -- 
> 1.7.7.6
> 

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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