From patchwork Mon Dec 12 07:47:07 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Glauber Costa X-Patchwork-Id: 130661 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 87132B6F9F for ; Mon, 12 Dec 2011 18:50:24 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753237Ab1LLHtr (ORCPT ); Mon, 12 Dec 2011 02:49:47 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:24446 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753049Ab1LLHsv (ORCPT ); Mon, 12 Dec 2011 02:48:51 -0500 Received: from straightjacket.localdomain.ru ([10.30.18.238]) by relay.sw.ru (8.13.4/8.13.4) with ESMTP id pBC7lb9V032347; Mon, 12 Dec 2011 10:48:07 +0300 (MSK) From: Glauber Costa To: davem@davemloft.net Cc: linux-kernel@vger.kernel.org, paul@paulmenage.org, lizf@cn.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com, ebiederm@xmission.com, 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 Subject: [PATCH v9 7/9] Display current tcp memory allocation in kmem cgroup Date: Mon, 12 Dec 2011 11:47:07 +0400 Message-Id: <1323676029-5890-8-git-send-email-glommer@parallels.com> X-Mailer: git-send-email 1.7.6.4 In-Reply-To: <1323676029-5890-1-git-send-email-glommer@parallels.com> References: <1323676029-5890-1-git-send-email-glommer@parallels.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch introduces kmem.tcp.usage_in_bytes file, living in the kmem_cgroup filesystem. It is a simple read-only file that displays the amount of kernel memory currently consumed by the cgroup. Signed-off-by: Glauber Costa Reviewed-by: Hiroyouki Kamezawa CC: David S. Miller CC: Eric W. Biederman --- Documentation/cgroups/memory.txt | 1 + net/ipv4/tcp_memcontrol.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+), 0 deletions(-) diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt index 1c9779a..6922b6c 100644 --- a/Documentation/cgroups/memory.txt +++ b/Documentation/cgroups/memory.txt @@ -79,6 +79,7 @@ Brief summary of control files. memory.independent_kmem_limit # select whether or not kernel memory limits are independent of user limits memory.kmem.tcp.limit_in_bytes # set/show hard limit for tcp buf memory + memory.kmem.tcp.usage_in_bytes # show current tcp buf memory allocation 1. History diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c index e353390..9481f23 100644 --- a/net/ipv4/tcp_memcontrol.c +++ b/net/ipv4/tcp_memcontrol.c @@ -17,6 +17,11 @@ static struct cftype tcp_files[] = { .read_u64 = tcp_cgroup_read, .private = RES_LIMIT, }, + { + .name = "kmem.tcp.usage_in_bytes", + .read_u64 = tcp_cgroup_read, + .private = RES_USAGE, + }, }; static inline struct tcp_memcontrol *tcp_from_cgproto(struct cg_proto *cg_proto) @@ -167,6 +172,19 @@ static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val) return res_counter_read_u64(&tcp->tcp_memory_allocated, type); } +static u64 tcp_read_usage(struct mem_cgroup *memcg) +{ + struct tcp_memcontrol *tcp; + struct cg_proto *cg_proto; + + cg_proto = tcp_prot.proto_cgroup(memcg); + if (!cg_proto) + return atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT; + + tcp = tcp_from_cgproto(cg_proto); + return res_counter_read_u64(&tcp->tcp_memory_allocated, RES_USAGE); +} + static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft) { struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); @@ -176,6 +194,9 @@ static u64 tcp_cgroup_read(struct cgroup *cont, struct cftype *cft) case RES_LIMIT: val = tcp_read_stat(memcg, RES_LIMIT, RESOURCE_MAX); break; + case RES_USAGE: + val = tcp_read_usage(memcg); + break; default: BUG(); }