linux-kernel - Re: [PATCH UPDATED 3/3] vhost: apply cpumask and cgroup to vhost pollers

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Message-ID: <4C0369CD.70008@cn.fujitsu.com>
Date:	Mon, 31 May 2010 15:48:29 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Sridhar Samudrala <sri@...ibm.com>,
	netdev <netdev@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitri Vorobiev <dmitri.vorobiev@...ial.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH UPDATED 3/3] vhost: apply cpumask and cgroup to vhost
 pollers

>  	poller = kthread_create(vhost_poller, dev, "vhost-%d", current->pid);
> -	if (IS_ERR(poller))
> -		return PTR_ERR(poller);
> +	if (IS_ERR(poller)) {
> +		ret = PTR_ERR(poller);
> +		goto out;

here...

> +	}
> +
> +	ret = sched_getaffinity(current->pid, mask);
> +	if (ret)
> +		goto out;
> +
> +	ret = sched_setaffinity(poller->pid, mask);
> +	if (ret)
> +		goto out;
> +
> +	ret = cgroup_attach_task_current_cg(poller);
> +	if (ret)
> +		goto out;
> 
>  	dev->vqs = vqs;
>  	dev->nvqs = nvqs;
> @@ -202,7 +221,14 @@ long vhost_dev_init(struct vhost_dev *de
>  			vhost_poll_init(&dev->vqs[i].poll,
>  					dev->vqs[i].handle_kick, POLLIN, dev);
>  	}
> -	return 0;
> +
> +	wake_up_process(poller);	/* avoid contributing to loadavg */
> +	ret = 0;
> +out:
> +	if (ret && poller)

It's still buggy..

> +		kthread_stop(poller);
> +	free_cpumask_var(mask);
> +	return ret;
>  }
> 
>  /* Caller should have device mutex */
> 
> 
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