linux-kernel - Re: [RFC][-mm] Simple stats for cpu resource controller v4

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Date:	Mon, 12 May 2008 11:11:24 +0530
From:	Balaji Rao <balajirrao@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	containers@...ts.osdl.org, menage@...gle.com, balbir@...ibm.com,
	vatsa@...ux.vnet.ibm.com, a.p.zijlstra@...llo.nl,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [RFC][-mm] Simple stats for cpu resource controller v4

On Monday 12 May 2008 08:24:45 am Li Zefan wrote:
> 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'
>
Yes, my mistake. Will fix it.
> > +#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().
Oh. Sorry, I totally missed it.
>
> >  	/* Bind the cgroup to task_group object we just created */

-- 
Warm Regards,

Balaji Rao
Dept. of Mechanical Engineering
NITK
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