Messages in this thread Patch in this message | | | From | Glauber Costa <> | Subject | [PATCH v2 07/14] per-cgroup boot time | Date | Tue, 1 Nov 2011 19:19:13 -0200 |
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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 | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index df0c4de..7dd4dea 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -303,6 +303,7 @@ struct task_group { struct cfs_bandwidth cfs_bandwidth; struct kernel_cpustat __percpu *cpustat; + struct timespec start_time; }; /* task_group_lock serializes the addition/removal of task groups */ @@ -8293,6 +8294,7 @@ 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 = &kernel_cpustat; #endif /* CONFIG_CGROUP_SCHED */ @@ -8767,6 +8769,8 @@ struct task_group *sched_create_group(struct task_group *parent) kstat_unlock(); } + get_monotonic_boottime(&tg->start_time); + spin_lock_irqsave(&task_group_lock, flags); list_add_rcu(&tg->list, &task_groups); @@ -9669,6 +9673,10 @@ 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 + if (static_branch(&sched_cgroup_enabled)) + boottime = timespec_add(boottime, tg->start_time); +#endif jif = boottime.tv_sec; for_each_possible_cpu(i) { -- 1.7.6.4
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