From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754048Ab2D0Frk (ORCPT ); Fri, 27 Apr 2012 01:47:40 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:49732 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751212Ab2D0Frj (ORCPT ); Fri, 27 Apr 2012 01:47:39 -0400 X-SecurityPolicyCheck: OK by SHieldMailChecker v1.7.4 Message-ID: <4F9A327A.6050409@jp.fujitsu.com> Date: Fri, 27 Apr 2012 14:45:30 +0900 From: KAMEZAWA Hiroyuki User-Agent: Mozilla/5.0 (Windows NT 6.0; rv:12.0) Gecko/20120420 Thunderbird/12.0 MIME-Version: 1.0 To: Linux Kernel CC: "linux-mm@kvack.org" , "cgroups@vger.kernel.org" , Michal Hocko , Johannes Weiner , Frederic Weisbecker , Glauber Costa , Tejun Heo , Han Ying , "Aneesh Kumar K.V" , Andrew Morton , kamezawa.hiroyuki@gmail.com Subject: [RFC][PATCH 0/7 v2] memcg: prevent failure in pre_destroy() Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a v2 patch for preventing failure in memcg->pre_destroy(). With this patch, ->pre_destroy() will never return error code and users will not see warning at rmdir(). And this work will simplify memcg->pre_destroy(), largely. This patch is based on linux-next + hugetlb memory control patches. I post this as RFC because I'll have vacation in the next week and hugetlb patches are not visible in linux-next yet. So, I'm not in hurry. Please review when you have time. I'll rebase this onto memcg-devel in the next post. == BTW, memory cgroup's github is here == git://github.com/mstsxfx/memcg-devel.git Since v1, Whole patch designs are changed. In this version, I didn't remove ->pre_destroy() but make it succeed always. There are no asynchronous operation and no big patches. But this introduces 2 changes to cgroup core. After this series, if use_hierarchy==0, all resources will be moved to root cgroup at rmdir() or force_empty(). Brief patch conents are 0001 : my version of compile-fix for linux-next, Aneesh will post his own version. 0002 : fix error code in hugetlb_force_memcg_empty 0003 : add res_counter_uncharge_until() 0004 : use res_counter_uncharge_until() at move_parent() 0005 : move charges to root cgroup at rmdir, if use_hierarchy=0 0006 : clean up mem_cgroup_move_account() 0007 : cgroup : avoid attaching task to cgroup where ->pre_destroy() is running. 0008 : cgroup : avoid creating a new cgroup under a cgroup where ->pre_destroy() is running. 0009 : remove -EINTR from memcg->pre_destroy(). Thanks, -Kame