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| author |   Jason Wang <jasowang@redhat.com> | 2020-05-29 16:02:58 +0800 |
|---|---|---|
| committer |   Michael S. Tsirkin <mst@redhat.com> | 2020-06-04 15:36:51 -0400 |
| commit | 01fcb1cbc88effb3493c6197efc96b69b9f4823a (patch) | |
| tree | 0334230859b145fbf8f10fe56ff06d3e5b17713f /drivers/vhost/vsock.c | |
| parent | MAINTAINERS: Add myself as virtio-balloon co-maintainer (diff) | |
| download | wireguard-linux-01fcb1cbc88effb3493c6197efc96b69b9f4823a.tar.xz wireguard-linux-01fcb1cbc88effb3493c6197efc96b69b9f4823a.zip | |
vhost: allow device that does not depend on vhost worker
vDPA device currently relays the eventfd via vhost worker. This is
inefficient due the latency of wakeup and scheduling, so this patch
tries to introduce a use_worker attribute for the vhost device. When
use_worker is not set with vhost_dev_init(), vhost won't try to
allocate a worker thread and the vhost_poll will be processed directly
in the wakeup function.
This help for vDPA since it reduces the latency caused by vhost worker.
In my testing, it saves 0.2 ms in pings between VMs on a mutual host.
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200529080303.15449-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/vhost/vsock.c')
| -rw-r--r-- | drivers/vhost/vsock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index fb4e944c4d0d..a483cec31d5c 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -632,7 +632,7 @@ static int vhost_vsock_dev_open(struct inode *inode, struct file *file) vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs), UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT, - VHOST_VSOCK_WEIGHT, NULL); + VHOST_VSOCK_WEIGHT, true, NULL); file->private_data = vsock; spin_lock_init(&vsock->send_pkt_list_lock); |