vhost: wake up worker outside spin_lock
the wake_up_process func is included by spin_lock/unlock in vhost_work_queue, but it could be done outside the spin_lock. I have test it with kernel 3.0.27 and guest suse11-sp2 using iperf, the num as below. original modified thread_num tp(Gbps) vhost(%) | tp(Gbps) vhost(%) 1 9.59 28.82 | 9.59 27.49 8 9.61 32.92 | 9.62 26.77 64 9.58 46.48 | 9.55 38.99 256 9.6 63.7 | 9.6 52.59 Signed-off-by: Chuanyu Qin <qinchuanyu@huawei.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -161,9 +161,11 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
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if (list_empty(&work->node)) {
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list_add_tail(&work->node, &dev->work_list);
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work->queue_seq++;
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spin_unlock_irqrestore(&dev->work_lock, flags);
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wake_up_process(dev->worker);
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} else {
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spin_unlock_irqrestore(&dev->work_lock, flags);
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}
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spin_unlock_irqrestore(&dev->work_lock, flags);
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}
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EXPORT_SYMBOL_GPL(vhost_work_queue);
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