linux-kernel - Re: [RFC][PATCH 4/6] memcg: swap cgroup for remembering account

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Message-Id: <20081112131701.dbb7d003.d-nishimura@mtf.biglobe.ne.jp>
Date:	Wed, 12 Nov 2008 13:17:01 +0900
From:	Daisuke Nishimura <d-nishimura@....biglobe.ne.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"menage@...gle.com" <menage@...gle.com>
Subject: Re: [RFC][PATCH 4/6] memcg: swap cgroup for remembering account

> +/**
> + * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
> + * @ent: swap entry to be looked up.
> + *
> + * Returns pointer to mem_cgroup at success. NULL at failure.
> + */
> +struct mem_cgroup *lookup_swap_cgroup(swp_entry_t ent)
> +{
> +	int type = swp_type(ent);
> +	unsigned long flags;
> +	unsigned long offset = swp_offset(ent);
> +	unsigned long idx = offset / SC_PER_PAGE;
> +	unsigned long pos = offset & SC_POS_MASK;
> +	struct swap_cgroup_ctrl *ctrl;
> +	struct page *mappage;
> +	struct swap_cgroup *sc;
> +	struct mem_cgroup *ret;
> +
> +	if (!do_swap_account)
> +		return NULL;
> +
> +	ctrl = &swap_cgroup_ctrl[type];
> +
> +	mappage = ctrl->map[idx];
> +
> +	spin_lock_irqsave(&ctrl->lock, flags);
> +	sc = kmap_atomic(mappage, KM_USER0);
> +	sc += pos;
> +	ret = sc->val;
> +	kunmap_atomic(mapppage, KM_USER0);
s/mapppage/mappage

I don't know why I didn't notice this while testing previous version.


Thanks,
Daisuke Nishimura.

> +	spin_unlock_irqrestore(&ctrl->lock, flags);
> +	return ret;
> +}
> +
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