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 528FB9000BD for ; Mon, 26 Sep 2011 10:40:25 -0400 (EDT) Message-ID: <4E808EA6.4000301@gmail.com> Date: Mon, 26 Sep 2011 18:39:34 +0400 From: Andrew Vagin Reply-To: avagin@gmail.com MIME-Version: 1.0 Subject: Re: [PATCH v3 4/7] per-cgroup tcp buffers control References: <1316393805-3005-1-git-send-email-glommer@parallels.com> <1316393805-3005-5-git-send-email-glommer@parallels.com> In-Reply-To: <1316393805-3005-5-git-send-email-glommer@parallels.com> Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Glauber Costa Cc: linux-kernel@vger.kernel.org, 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 We can't change net.ipv4.tcp_mem if a cgroup with memory controller isn't mounted. [root@dhcp-10-30-20-19 ~]# sysctl -w net.ipv4.tcp_mem="3 2 3" error: "Invalid argument" setting key "net.ipv4.tcp_mem" It's because tcp_max_memory is initialized in mem_cgroup_populate: mem_cgroup_populate->register_kmem_files->sockets_populate->tcp_init_cgroup > +int sockets_populate(struct cgroup *cgrp, struct cgroup_subsys *ss) > +{ > + struct proto *proto; > + int ret = 0; > + > + read_lock(&proto_list_lock); > + list_for_each_entry(proto,&proto_list, node) { > + if (proto->init_cgroup) > + ret |= proto->init_cgroup(proto, cgrp, ss); > + } > + if (!ret) > + goto out; > + > + list_for_each_entry_continue_reverse(proto,&proto_list, node) > + if (proto->destroy_cgroup) > + proto->destroy_cgroup(proto, cgrp, ss); > + > +out: > + read_unlock(&proto_list_lock); > + return ret; > +} > @@ -198,6 +203,21 @@ static int ipv4_tcp_mem(ctl_table *ctl, int write, > if (ret) > return ret; > > +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM > + rcu_read_lock(); > + cg = mem_cgroup_from_task(current); > + for (i = 0; i< 3; i++) > + if (vec[i]> tcp_max_memory(cg)) { > + rcu_read_unlock(); > + return -EINVAL; > + } -- 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