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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; > +} > + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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