From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752810Ab1IWWZm (ORCPT ); Fri, 23 Sep 2011 18:25:42 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:19180 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752610Ab1IWWZl (ORCPT ); Fri, 23 Sep 2011 18:25:41 -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: [RFD 5/9] per-cgroup boot time Date: Fri, 23 Sep 2011 19:20:28 -0300 Message-Id: <1316816432-9237-6-git-send-email-glommer@parallels.com> X-Mailer: git-send-email 1.7.6 In-Reply-To: <1316816432-9237-1-git-send-email-glommer@parallels.com> References: <1316816432-9237-1-git-send-email-glommer@parallels.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Record the time in which the cgroup was created. This can be used to provide a more accurate boottime information in cpuacct.proc.stat. Signed-off-by: Glauber Costa --- kernel/sched.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 9c6e44e..7612410 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -280,6 +280,7 @@ struct task_group { #endif unsigned long total_forks; struct kernel_stat __percpu *cpustat; + struct timespec start_time; }; /* task_group_lock serializes the addition/removal of task groups */ @@ -8141,6 +8142,7 @@ void __init sched_init(void) INIT_LIST_HEAD(&root_task_group.siblings); autogroup_init(&init_task); + root_task_group.start_time = (struct timespec){0, 0}; root_task_group.cpustat = alloc_percpu(struct kernel_stat); /* Failing that early an allocation means we're screwed anyway */ BUG_ON(!root_task_group.cpustat); @@ -8619,6 +8621,8 @@ struct task_group *sched_create_group(struct task_group *parent) kstat->cpustat[IOWAIT_BASE] = root_kstat->cpustat[IOWAIT]; } + get_monotonic_boottime(&tg->start_time); + spin_lock_irqsave(&task_group_lock, flags); list_add_rcu(&tg->list, &task_groups); @@ -9154,6 +9158,7 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, struct seq_fil irq = softirq = steal = cputime64_zero; guest = guest_nice = cputime64_zero; getboottime(&boottime); + boottime = timespec_add(boottime, tg->start_time); jif = boottime.tv_sec; for_each_possible_cpu(i) { -- 1.7.6