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vhost: wake up worker outside spin_lock

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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 <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
This commit is contained in:
Qin Chuanyu 2013-06-07 21:50:16 +08:00 • committed by Michael S. Tsirkin
commit ac9fde2474
1 changed files with 3 additions and 1 deletions
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4
drivers/vhost/vhost.c
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@ -161,9 +161,11 @@ void vhost_work_queue(struct vhost_dev *dev, struct vhost_work *work)
if (list_empty(&work->node)) {
list_add_tail(&work->node, &dev->work_list);
work->queue_seq++;
spin_unlock_irqrestore(&dev->work_lock, flags);
wake_up_process(dev->worker);
} else {
spin_unlock_irqrestore(&dev->work_lock, flags);
}
spin_unlock_irqrestore(&dev->work_lock, flags);
}
EXPORT_SYMBOL_GPL(vhost_work_queue);