From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 20 Aug 2008 20:33:30 +0900 (JST) Message-Id: <20080820.203330.58805720.taka@valinux.co.jp> Subject: Re: [RFC][PATCH -mm 0/7] memcg: lockless page_cgroup v1 From: Hirokazu Takahashi 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.hiroyu@jp.fujitsu.com Cc: linux-kernel@vger.kernel.org, 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: Hi, > 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 Thanks, Kame. It is a good news that the page tracking framework is open. I think I can send some feedback to you to make it more generic. > 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". > Thanks, Hirokazu Takahashi. -- 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