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

Li Zefan
2010-05-31T07:46:12Z

> 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 */
>
>