From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756684AbaGCMtu (ORCPT ); Thu, 3 Jul 2014 08:49:50 -0400 Received: from mx2.parallels.com ([199.115.105.18]:53626 "EHLO mx2.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756492AbaGCMtr (ORCPT ); Thu, 3 Jul 2014 08:49:47 -0400 From: Vladimir Davydov To: CC: , , Andrew Morton , Tejun Heo , Li Zefan , Johannes Weiner , Michal Hocko , Mel Gorman , Rik van Riel , "Kirill A. Shutemov" , Hugh Dickins , David Rientjes , Pavel Emelyanov , Balbir Singh Subject: [PATCH RFC 5/5] vm_cgroup: do not charge tasks in root cgroup Date: Thu, 3 Jul 2014 16:48:21 +0400 Message-ID: X-Mailer: git-send-email 1.7.10.4 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For the root cgroup (the whole system), we already have overcommit accounting and control, so we can skip charging tasks in the root cgroup to avoid overhead. Signed-off-by: Vladimir Davydov --- mm/vm_cgroup.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/vm_cgroup.c b/mm/vm_cgroup.c index 6642f934540a..c871fecaab4c 100644 --- a/mm/vm_cgroup.c +++ b/mm/vm_cgroup.c @@ -1,6 +1,7 @@ #include #include #include +#include #include #include #include @@ -65,6 +66,9 @@ static int vm_cgroup_do_charge(struct vm_cgroup *vmcg, unsigned long val = nr_pages << PAGE_SHIFT; struct res_counter *fail_res; + if (vm_cgroup_is_root(vmcg)) + return 0; + return res_counter_charge(&vmcg->res, val, &fail_res); } @@ -73,6 +77,9 @@ static void vm_cgroup_do_uncharge(struct vm_cgroup *vmcg, { unsigned long val = nr_pages << PAGE_SHIFT; + if (vm_cgroup_is_root(vmcg)) + return; + res_counter_uncharge(&vmcg->res, val); } @@ -159,6 +166,9 @@ static u64 vm_cgroup_read_u64(struct cgroup_subsys_state *css, struct vm_cgroup *vmcg = vm_cgroup_from_css(css); int memb = cft->private; + if (vm_cgroup_is_root(vmcg)) + return vm_memory_committed() << PAGE_SHIFT; + return res_counter_read_u64(&vmcg->res, memb); } -- 1.7.10.4