linux-kernel - Re: [PATCH 5/8] memcg: convert to use cgroup->id

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Date:	Mon, 8 Apr 2013 16:57:02 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 5/8] memcg: convert to use cgroup->id

On Mon 08-04-13 16:22:11, Li Zefan wrote:
> This is a preparation to kill css_id.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

This patch depends on the following patch, doesn't it? There is no
guarantee that id fits into short right now. Not such a big deal but
would be nicer to have that guarantee for bisectability.

The patch on its own looks good.

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

> ---
>  mm/memcontrol.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 3561d0b..c4e0173 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -492,6 +492,11 @@ static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
>  	return (memcg == root_mem_cgroup);
>  }
>  
> +static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
> +{
> +	return memcg->css.cgroup->id;
> +}
> +
>  /* Writing them here to avoid exposing memcg's inner layout */
>  #if defined(CONFIG_INET) && defined(CONFIG_MEMCG_KMEM)
>  
> @@ -4234,7 +4239,7 @@ mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
>  	 * css_get() was called in uncharge().
>  	 */
>  	if (do_swap_account && swapout && memcg)
> -		swap_cgroup_record(ent, css_id(&memcg->css));
> +		swap_cgroup_record(ent, mem_cgroup_id(memcg));
>  }
>  #endif
>  
> @@ -4286,8 +4291,8 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry,
>  {
>  	unsigned short old_id, new_id;
>  
> -	old_id = css_id(&from->css);
> -	new_id = css_id(&to->css);
> +	old_id = mem_cgroup_id(from);
> +	new_id = mem_cgroup_id(to);
>  
>  	if (swap_cgroup_cmpxchg(entry, old_id, new_id) == old_id) {
>  		mem_cgroup_swap_statistics(from, false);
> @@ -6428,7 +6433,7 @@ static enum mc_target_type get_mctgt_type(struct vm_area_struct *vma,
>  	}
>  	/* There is a swap entry and a page doesn't exist or isn't charged */
>  	if (ent.val && !ret &&
> -			css_id(&mc.from->css) == lookup_swap_cgroup_id(ent)) {
> +	    mem_cgroup_id(mc.from) == lookup_swap_cgroup_id(ent)) {
>  		ret = MC_TARGET_SWAP;
>  		if (target)
>  			target->ent = ent;
> -- 
> 1.8.0.2
> 
> --
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-- 
Michal Hocko
SUSE Labs
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