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vhost: avoid backend flush on vring ops

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vring changes already do a flush internally where appropriate, so we do
not need a second flush.

It's currently not very expensive but a follow-up patch makes flush more
heavy-weight, so remove the extra flush here to avoid regressing
performance if call or kick fds are changed on data path.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
2012-12-06 14:03:34 +02:00
parent 4a7d6455b0
commit 935cdee7ee
4 changed files with 14 additions and 8 deletions
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7
drivers/vhost/net.c
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@@ -942,8 +942,11 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
return vhost_net_reset_owner(n);
default:
mutex_lock(&n->dev.mutex);
r = vhost_dev_ioctl(&n->dev, ioctl, arg);
vhost_net_flush(n);
r = vhost_dev_ioctl(&n->dev, ioctl, argp);
if (r == -ENOIOCTLCMD)
r = vhost_vring_ioctl(&n->dev, ioctl, argp);
else
vhost_net_flush(n);
mutex_unlock(&n->dev.mutex);
return r;
}