linux-kernel - Re: [Patch 4/4] sched: Improve fairness of cpu bandwidth allocation for task groups

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Message-ID: <20071126202836.GA17012@elte.hu>
Date:	Mon, 26 Nov 2007 21:28:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	dmitry.adamushko@...il.com, a.p.zijlstra@...llo.nl,
	dhaval@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	efault@....de, skumar@...ux.vnet.ibm.com,
	Balbir Singh <balbir@...ibm.com>,
	Dipankar <dipankar@...ibm.com>
Subject: Re: [Patch 4/4] sched: Improve fairness of cpu bandwidth
	allocation for task groups


* Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> wrote:

> +	/* we don't want this thread's execution to be limited by the shares
> +	 * assigned to default group (init_task_group). Hence make it run
> +	 * as a RT task.
> +	 */
> +	schedparm.sched_priority = 0; /* run at the lowest RT prio */
> +	ret = sched_setscheduler(current, SCHED_RR, &schedparm);
> +	if (ret)
> +		printk(KERN_ERR "Couldn't set SCHED_RR policy for load balance"
> +				"monitor thread (error = %d) \n", ret);

the first SCHED_RR priority is 1, not 0 - so this call will always fail.

> +		lock_cpu_hotplug(); /* Prevent cpus going down or coming up */
> +		lock_doms_cur();    /* lockout changes to doms_cur[] array */

please put comments in front of the line like we do in most of sched.c.

> +		rcu_read_lock();  /* to walk rq->sd chain on various cpus and to
> +				   * walk task group list in rebalance_shares().
> +				   */

the proper comment format is in front of the line and in:

	/*
	 * Comment.
	 */

	Ingo
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