linux-kernel - Re: (resend) [PATCH] vmscan,memcg: memcg aware swap token

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Message-Id: <20110426130724.f2ae18e3.akpm@linux-foundation.org>
Date:	Tue, 26 Apr 2011 13:07:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Nishimura Daisuke <d-nishimura@....biglobe.ne.jp>
Subject: Re: (resend) [PATCH] vmscan,memcg: memcg aware swap token

On Tue, 26 Apr 2011 16:59:19 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> @@ -75,3 +76,19 @@ void __put_swap_token(struct mm_struct *mm)
>  		swap_token_mm = NULL;
>  	spin_unlock(&swap_token_lock);
>  }
> +
> +int has_swap_token_memcg(struct mm_struct *mm, struct mem_cgroup *memcg)
> +{
> +	if (memcg) {
> +		struct mem_cgroup *swap_token_memcg;
> +
> +		/*
> +		 * memcgroup reclaim can disable swap token only if token task
> +		 * is in the same cgroup.
> +		 */
> +		swap_token_memcg = try_get_mem_cgroup_from_mm(swap_token_mm);
> +		return ((mm == swap_token_mm) && (memcg == swap_token_memcg));
> +	} else
> +		return (mm == swap_token_mm);
> +}

Seems to be missing a css_put()?

Either I'm mistaken or that's a bug.  Perhaps neither of these would
have happened if we'd bothered to document
try_get_mem_cgroup_from_mm().

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