Messages in this thread Patch in this message | | | From | Glauber Costa <> | Subject | [PATCH 06/10] per-cgroup boot time | Date | Sun, 2 Oct 2011 23:21:23 +0400 |
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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 <glommer@parallels.com> --- kernel/sched.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index 5a8181e..a2554b7 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -279,6 +279,7 @@ struct task_group { struct autogroup *autogroup; #endif struct kernel_stat __percpu *cpustat; + struct timespec start_time; }; /* task_group_lock serializes the addition/removal of task groups */ @@ -8127,6 +8128,7 @@ 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); @@ -8598,6 +8600,8 @@ 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); @@ -9182,6 +9186,9 @@ int cpu_cgroup_proc_stat(struct cgroup *cgrp, struct cftype *cft, irq = softirq = steal = 0; guest = guest_nice = 0; getboottime(&boottime); +#ifdef CONFIG_CGROUP_SCHED + boottime = timespec_add(boottime, tg->start_time); +#endif jif = boottime.tv_sec; for_each_possible_cpu(i) { -- 1.7.6
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