From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 1133C6008C6 for ; Tue, 24 Aug 2010 04:59:58 -0400 (EDT) Message-ID: <4C738B34.6070602@cn.fujitsu.com> Date: Tue, 24 Aug 2010 17:04:52 +0800 From: Li Zefan MIME-Version: 1.0 Subject: Re: [PATCH 1/5] cgroup: ID notification call back References: <20100820185552.426ff12e.kamezawa.hiroyu@jp.fujitsu.com> <20100820185816.1dbcd53a.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20100820185816.1dbcd53a.kamezawa.hiroyu@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: KAMEZAWA Hiroyuki Cc: linux-mm@kvack.org, "nishimura@mxp.nes.nec.co.jp" , "balbir@linux.vnet.ibm.com" , gthelen@google.com, m-ikeda@ds.jp.nec.com, "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" , kamezawa.hiroyuki@gmail.com, "menage@google.com" List-ID: KAMEZAWA Hiroyuki wrote: > CC'ed to Paul Menage and Li Zefan. > == > From: KAMEZAWA Hiroyuki > > When cgroup subsystem use ID (ss->use_id==1), each css's ID is assigned > after successful call of ->create(). css_ID is tightly coupled with > css struct itself but it is allocated by ->create() call, IOW, > per-subsystem special allocations. > > To know css_id before creation, this patch adds id_attached() callback. > after css_ID allocation. This will be used by memory cgroup's quick lookup > routine. > > Maybe you can think of other implementations as > - pass ID to ->create() > or > - add post_create() > etc... > But when considering dirtiness of codes, this straightforward patch seems > good to me. If someone wants post_create(), this patch can be replaced. > > Changelog: 20100820 > - new approarch. > > Signed-off-by: KAMEZAWA Hiroyuki Acked-by: Li Zefan ... > > Index: mmotm-0811/include/linux/cgroup.h > =================================================================== > --- mmotm-0811.orig/include/linux/cgroup.h > +++ mmotm-0811/include/linux/cgroup.h > @@ -475,6 +475,7 @@ struct cgroup_subsys { > struct cgroup *cgrp); > void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp); > void (*bind)(struct cgroup_subsys *ss, struct cgroup *root); > + void (*id_attached)(struct cgroup_subsys *ss, struct cgroup *cgrp); Maybe pass the id number to id_attached() is better. And actually the @ss argument is not necessary, because the memcg's id_attached() handler of course knows it's dealing with the memory cgroup subsystem. So I suspect we can just remove all the @ss from all the callbacks.. -- 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