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    Subject[PATCH v2 07/14] per-cgroup boot time
    Date
    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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