diff options
| author | Jason Wang <jasowang@redhat.com> | 2013-06-05 23:54:34 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-07 23:49:08 -0700 |
| commit | 89cee917deb5bf0dc9da269a38622588d06cb6be (patch) | |
| tree | ff7285962e65a9444d8debcb232406b939853570 | |
| parent | ed0483fa06e0efb86a82e382a00dbad02b62807c (diff) | |
macvtap: do not add self to waitqueue if doing a nonblock read
There's no need to add self to waitqueue if doing a nonblock read. This could
help to avoid the spinlock contention.
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/macvtap.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index 5e485e30742..8949631c080 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -845,7 +845,9 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb, ssize_t ret = 0; while (len) { - prepare_to_wait(sk_sleep(&q->sk), &wait, TASK_INTERRUPTIBLE); + if (!noblock) + prepare_to_wait(sk_sleep(&q->sk), &wait, + TASK_INTERRUPTIBLE); /* Read frames from the queue */ skb = skb_dequeue(&q->sk.sk_receive_queue); @@ -867,7 +869,8 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb, break; } - finish_wait(sk_sleep(&q->sk), &wait); + if (!noblock) + finish_wait(sk_sleep(&q->sk), &wait); return ret; } |