netdev - Re: [PATCH 1/2] vhost: remove the possible fruitless search on iotlb prefetch

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Date:   Tue, 22 Aug 2017 23:09:44 +0900
From:   Koichiro Den <den@...ipeden.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     jasowang@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] vhost: remove the possible fruitless search on
 iotlb prefetch

On Mon, 2017-08-21 at 22:45 +0300, Michael S. Tsirkin wrote:
> On Sat, Aug 19, 2017 at 03:41:14PM +0900, Koichiro Den wrote:
> > Signed-off-by: Koichiro Den <den@...ipeden.com>
> > ---
> >  drivers/vhost/vhost.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> > index e4613a3c362d..93e909afc1c3 100644
> > --- a/drivers/vhost/vhost.c
> > +++ b/drivers/vhost/vhost.c
> > @@ -1184,7 +1184,7 @@ static int iotlb_access_ok(struct vhost_virtqueue *vq,
> >  	while (len > s) {
> >  		node = vhost_umem_interval_tree_iter_first(&umem-
> > >umem_tree,
> >  							   addr,
> > -							   addr + len - 1);
> > +							   addr + len - s -
> > 1);
> >  		if (node == NULL || node->start > addr) {
> >  			vhost_iotlb_miss(vq, addr, access);
> >  			return false;
> 
> This works but it probably makes sense to just refactor the code to make end
> of
> range a variable. I posted a patch like this, pls take a look.
> 
> > -- 
> > 2.9.4
> > 
Ok, thanks.