From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754229Ab1JBTXB (ORCPT ); Sun, 2 Oct 2011 15:23:01 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:35353 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754192Ab1JBTWh (ORCPT ); Sun, 2 Oct 2011 15:22:37 -0400 From: Glauber Costa To: linux-kernel@vger.kernel.org Cc: paul@paulmenage.org, lizf@cn.fujitsu.com, daniel.lezcano@free.fr, a.p.zijlstra@chello.nl, jbottomley@parallels.com, Glauber Costa Subject: [PATCH 07/10] Report steal time for cgroup Date: Sun, 2 Oct 2011 23:21:24 +0400 Message-Id: <1317583287-18300-8-git-send-email-glommer@parallels.com> X-Mailer: git-send-email 1.7.6.2 In-Reply-To: <1317583287-18300-1-git-send-email-glommer@parallels.com> References: <1317583287-18300-1-git-send-email-glommer@parallels.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch introduces a functionality commonly found in hypervisors: steal time. For those not particularly familiar with it, steal time is defined as any time in which a virtual machine (or container) wanted to perform cpu work, but could not due to another VM/container being scheduled in its place. Note that idle time is never defined as steal time. Assuming each container will live in its cgroup, we can very easily and nicely calculate steal time as all user/system time recorded in our sibling cgroups. Signed-off-by: Glauber Costa --- kernel/sched.c | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index a2554b7..dec73c4 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -9175,6 +9175,7 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, struct timespec boottime; #ifdef CONFIG_CGROUP_SCHED struct task_group *tg; + struct task_group *sib; if (cgrp) tg = cgroup_tg(cgrp); @@ -9215,6 +9216,20 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, guest += kstat->cpustat[GUEST]; guest_nice += kstat->cpustat[GUEST_NICE]; total_forks += kstat->cpustat[TOTAL_FORKS]; + steal += kstat->cpustat[STEAL]; +#ifdef CONFIG_CGROUP_SCHED + rcu_read_lock(); + list_for_each_entry(sib, &tg->siblings, siblings) { + struct kernel_stat *ksib; + if (!sib) + continue; + + ksib = per_cpu_ptr(sib->cpustat, i); + steal += ksib->cpustat[USER] + ksib->cpustat[SYSTEM] + + ksib->cpustat[IRQ] + ksib->cpustat[SOFTIRQ]; + } + rcu_read_unlock(); +#endif sum += kstat_cpu_irqs_sum(i); sum += arch_irq_stat_cpu(i); @@ -9260,6 +9275,19 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, irq = kstat->cpustat[IRQ]; softirq = kstat->cpustat[SOFTIRQ]; steal = kstat->cpustat[STEAL]; +#ifdef CONFIG_CGROUP_SCHED + rcu_read_lock(); + list_for_each_entry(sib, &tg->siblings, siblings) { + struct kernel_stat *ksib; + if (!sib) + continue; + + ksib = per_cpu_ptr(sib->cpustat, i); + steal += ksib->cpustat[USER] + ksib->cpustat[SYSTEM] + + ksib->cpustat[IRQ] + ksib->cpustat[SOFTIRQ]; + } + rcu_read_unlock(); +#endif guest = kstat->cpustat[GUEST]; guest_nice = kstat->cpustat[GUEST_NICE]; seq_printf(p, -- 1.7.6