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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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