From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id BCF416B004D for ; Tue, 29 Nov 2011 19:12:18 -0500 (EST) From: Glauber Costa Subject: [PATCH v7 10/10] Disable task moving when using kernel memory accounting Date: Tue, 29 Nov 2011 21:57:01 -0200 Message-Id: <1322611021-1730-11-git-send-email-glommer@parallels.com> In-Reply-To: <1322611021-1730-1-git-send-email-glommer@parallels.com> References: <1322611021-1730-1-git-send-email-glommer@parallels.com> Sender: owner-linux-mm@kvack.org List-ID: 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, cgroups@vger.kernel.org, Glauber Costa 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 a31a278..dd9a6d9 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5453,10 +5453,19 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, { int ret = 0; struct mem_cgroup *memcg = 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 != memcg && !mem_cgroup_is_root(from) && + res_counter_read_u64(&from->tcp_mem.tcp_memory_allocated, RES_USAGE)) { + printk(KERN_WARNING "Can't move tasks between cgroups: " + "Kernel memory held.\n"); + return 1; + } +#endif if (memcg->move_charge_at_immigrate) { struct mm_struct *mm; - struct mem_cgroup *from = mem_cgroup_from_task(p); VM_BUG_ON(from == memcg); @@ -5624,6 +5633,18 @@ static int mem_cgroup_can_attach(struct cgroup_subsys *ss, struct cgroup *cgroup, struct task_struct *p) { + struct mem_cgroup *memcg = 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 != memcg && !mem_cgroup_is_root(from) && + res_counter_read_u64(&from->tcp_mem.tcp_memory_allocated, RES_USAGE)) { + printk(KERN_WARNING "Can't move tasks between cgroups: " + "Kernel memory held.\n"); + return 1; + } +#endif + return 0; } static void mem_cgroup_cancel_attach(struct cgroup_subsys *ss, -- 1.7.6.4 -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org