On Wed, Dec 28, 2016 at 04:09:29PM +0800, Jason Wang wrote: > This patch tries to do several tweaks on vhost_vq_avail_empty() for a > better performance: > > - check cached avail index first which could avoid userspace memory access. > - using unlikely() for the failure of userspace access > - check vq->last_avail_idx instead of cached avail index as the last > step. > > This patch is need for batching supports which needs to peek whether > or not there's still available buffers in the ring. > > Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> > --- > drivers/vhost/vhost.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
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