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Subject[RFD 5/9] 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 | 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


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