From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 20 Aug 2008 19:41:08 +0900 From: KAMEZAWA Hiroyuki Subject: Re: [RFC][PATCH -mm 0/7] memcg: lockless page_cgroup v1 Message-Id: <20080820194108.e76b20b3.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <20080820185306.e897c512.kamezawa.hiroyu@jp.fujitsu.com> References: <20080819173014.17358c17.kamezawa.hiroyu@jp.fujitsu.com> <20080820185306.e897c512.kamezawa.hiroyu@jp.fujitsu.com> 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: LKML , "balbir@linux.vnet.ibm.com" , "yamamoto@valinux.co.jp" , "nishimura@mxp.nes.nec.co.jp" , ryov@valinux.co.jp, "linux-mm@kvack.org" List-ID: On Wed, 20 Aug 2008 18:53:06 +0900 KAMEZAWA Hiroyuki wrote: > Hi, this is a patch set for lockless page_cgroup. > > dropped patches related to mem+swap controller for easy review. > (I'm rewriting it, too.) > > Changes from current -mm is. > - page_cgroup->flags operations is set to be atomic. > - lock_page_cgroup() is removed. > - page->page_cgroup is changed from unsigned long to struct page_cgroup* > - page_cgroup is freed by RCU. > - For avoiding race, charge/uncharge against mm/memory.c::insert_page() is > omitted. This is ususally used for mapping device's page. (I think...) > > In my quick test, perfomance is improved a little. But the benefit of this > patch is to allow access page_cgroup without lock. I think this is good > for Yamamoto's Dirty page tracking for memcg. > For I/O tracking people, I added a header file for allowing access to > page_cgroup from out of memcontrol.c > > The base kernel is recent mmtom. Any comments are welcome. > This is still under test. I have to do long-run test before removing "RFC". > Known problem: force_emtpy is broken...so rmdir will struck into nightmare. It's because of patch 2/7. will be fixed in the next version. Thanks, -Kame -- 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