Balaji Rao wrote:
>  /*
> @@ -3892,8 +3923,17 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
>  		cpustat->irq = cputime64_add(cpustat->irq, tmp);
>  	else if (softirq_count())
>  		cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
> -	else if (p != rq->idle)
> +	else if (p != rq->idle) {
>  		cpustat->system = cputime64_add(cpustat->system, tmp);
> +#ifdef CONFIG_CGROUP_SCHED
> +		{
> +			struct task_group *tg;
> +			tg = task_group(p);
> +			__cpu_cgroup_stat_add(tg->stat, CPU_CGROUP_STAT_STIME,
> +					cputime_to_msecs(cputime));
> +		}
> +	}

You should put this '}' after '#endif'

> +#endif
>  	else if (atomic_read(&rq->nr_iowait) > 0)
>  		cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
>  	else
> @@ -8179,10 +8219,26 @@ static inline struct task_group *cgroup_tg(struct cgroup *cgrp)
>  			    struct task_group, css);
>  }
>  
> +static void cpu_cgroup_initialize(int early)
> +{
> +	int i;
> +	struct cpu_cgroup_stat *stat;
> +
> +	if (!early) {
> +		stat = kmalloc(sizeof(struct cpu_cgroup_stat)
> +				, GFP_KERNEL);
> +		for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++)
> +			percpu_counter_init(
> +					&stat->cpustat[i], 0);
> +		init_task_group.stat = stat;
> +	}
> +}
> +
>  static struct cgroup_subsys_state *
>  cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
>  {
>  	struct task_group *tg;
> +	int i;
>  
>  	if (!cgrp->parent) {
>  		/* This is early initialization for the top cgroup */
> @@ -8198,6 +8254,10 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
>  	if (IS_ERR(tg))
>  		return ERR_PTR(-ENOMEM);
>  
> +	tg->stat = kmalloc(sizeof(struct cpu_cgroup_stat), GFP_KERNEL);
> +	for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++)
> +		percpu_counter_init(&tg->stat->cpustat[i], 0);
> +

I guess you forgot to free those things in cpu_cgroup_destroy().

>  	/* Bind the cgroup to task_group object we just created */
>  	tg->css.cgroup = cgrp;
>  
> @@ -8251,6 +8311,38 @@ static u64 cpu_shares_read_u64(struct cgroup *cgrp, struct cftype *cft)
>  }
>  #endif
>  
> +static s64 cpu_cgroup_read_stat(struct cpu_cgroup_stat *stat,
> +		enum cpu_cgroup_stat_index idx)
> +{
> +	if (stat)
> +		return percpu_counter_read(&stat->cpustat[idx]);
> +
> +	return 0;
> +}
> +
> +static const struct cpu_cgroup_stat_desc {
> +	const char *msg;
> +	u64 unit;
> +} cpu_cgroup_stat_desc[] = {
> +	[CPU_CGROUP_STAT_UTIME] = { "utime", 1, },
> +	[CPU_CGROUP_STAT_STIME] = { "stime", 1, },
> +};
> +
> +static int cpu_cgroup_stats_show(struct cgroup *cgrp, struct cftype *cft,
> +		struct cgroup_map_cb *cb)
> +{
> +	struct task_group *tg = cgroup_tg(cgrp);
> +	struct cpu_cgroup_stat *stat = tg->stat;
> +	int i;
> +	for (i = 0; i < CPU_CGROUP_STAT_NSTATS; i++) {
> +		s64 val;
> +		val = cpu_cgroup_read_stat(stat, i);
> +		val *= cpu_cgroup_stat_desc[i].unit;
> +		cb->fill(cb, cpu_cgroup_stat_desc[i].msg, val);
> +	}
> +	return 0;
> +}
> +
>  #ifdef CONFIG_RT_GROUP_SCHED
>  static ssize_t cpu_rt_runtime_write(struct cgroup *cgrp, struct cftype *cft,
>  				s64 val)
> @@ -8295,6 +8387,10 @@ static struct cftype cpu_files[] = {
>  		.write_u64 = cpu_rt_period_write_uint,
>  	},
>  #endif
> +	{
> +		.name = "stat",
> +		.read_map = cpu_cgroup_stats_show,
> +	},
>  };
>  
>  static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
> @@ -8304,6 +8400,7 @@ static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
>  
>  struct cgroup_subsys cpu_cgroup_subsys = {
>  	.name		= "cpu",
> +	.initialize	= cpu_cgroup_initialize,
>  	.create		= cpu_cgroup_create,
>  	.destroy	= cpu_cgroup_destroy,
>  	.can_attach	= cpu_cgroup_can_attach,
> --
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