From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932668Ab1KGP3Y (ORCPT ); Mon, 7 Nov 2011 10:29:24 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:6298 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932629Ab1KGP3U (ORCPT ); Mon, 7 Nov 2011 10:29:20 -0500 From: Glauber Costa To: linux-kernel@vger.kernel.org Cc: paul@paulmenage.org, lizf@cn.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com, ebiederm@xmission.com, davem@davemloft.net, gthelen@google.com, netdev@vger.kernel.org, linux-mm@kvack.org, kirill@shutemov.name, avagin@parallels.com, devel@openvz.org, eric.dumazet@gmail.com, Glauber Costa Subject: [PATCH v5 10/10] Disable task moving when using kernel memory accounting Date: Mon, 7 Nov 2011 13:26:35 -0200 Message-Id: <1320679595-21074-11-git-send-email-glommer@parallels.com> X-Mailer: git-send-email 1.7.6.4 In-Reply-To: <1320679595-21074-1-git-send-email-glommer@parallels.com> References: <1320679595-21074-1-git-send-email-glommer@parallels.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since this code is still experimental, we are leaving the exact details of how to move tasks between cgroups when kernel memory accounting is used as future work. For now, we simply disallow movement if there are any pending accounted memory. Signed-off-by: Glauber Costa CC: Hiroyouki Kamezawa --- mm/memcontrol.c | 23 ++++++++++++++++++++++- 1 files changed, 22 insertions(+), 1 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index b532f91..248f92d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5690,10 +5690,19 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, { int ret = 0; struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup); + struct mem_cgroup *from = mem_cgroup_from_task(p); + +#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET) + if (from != mem && !mem_cgroup_is_root(from) && + res_counter_read_u64(&from->tcp.tcp_memory_allocated, RES_USAGE)) { + printk(KERN_WARNING "Can't move tasks between cgroups: " + "Kernel memory held. task: %s\n", p->comm); + return 1; + } +#endif if (mem->move_charge_at_immigrate) { struct mm_struct *mm; - struct mem_cgroup *from = mem_cgroup_from_task(p); VM_BUG_ON(from == mem); @@ -5861,6 +5870,18 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p) { + struct mem_cgroup *mem = mem_cgroup_from_cont(cgroup); + struct mem_cgroup *from = mem_cgroup_from_task(p); + +#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_INET) + if (from != mem && !mem_cgroup_is_root(from) && + res_counter_read_u64(&from->tcp.tcp_memory_allocated, RES_USAGE)) { + printk(KERN_WARNING "Can't move tasks between cgroups: " + "Kernel memory held. task: %s\n", p->comm); + return 1; + } +#endif + return 0; } static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, -- 1.7.6.4