From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 12 Nov 2008 13:17:01 +0900 From: Daisuke Nishimura Subject: Re: [RFC][PATCH 4/6] memcg: swap cgroup for remembering account Message-Id: <20081112131701.dbb7d003.d-nishimura@mtf.biglobe.ne.jp> In-Reply-To: <20081112122949.d17bbc7f.kamezawa.hiroyu@jp.fujitsu.com> References: <20081112122606.76051530.kamezawa.hiroyu@jp.fujitsu.com> <20081112122949.d17bbc7f.kamezawa.hiroyu@jp.fujitsu.com> Reply-To: nishimura@mxp.nes.nec.co.jp Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: KAMEZAWA Hiroyuki Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "balbir@linux.vnet.ibm.com" , "nishimura@mxp.nes.nec.co.jp" , "menage@google.com" List-ID: > +/** > + * 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org