linux-kernel - Re: [PATCH v2 1/4] Defer skb allocation -- add destroy buffers function for virtio

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Message-ID: <20091215105748.GB11525@redhat.com>
Date:	Tue, 15 Dec 2009 12:57:48 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Avi Kivity <avi@...hat.com>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [PATCH v2 1/4] Defer skb allocation -- add destroy buffers
	function for virtio

On Mon, Dec 14, 2009 at 03:22:22PM -0800, Shirley Ma wrote:
> Hello Michael,
> 
> On Mon, 2009-12-14 at 22:22 +0200, Michael S. Tsirkin wrote:
> > I dont insist, but my idea was
> > 
> > for (;;) {
> >         b = vq->destroy(vq);
> >         if (!b)
> >                 break;
> >         --vi->num;
> >         put_page(b);
> > }
> > 
> > so we do not have to lose track of the counter.
> 
> That's not a bad idea, but to do this, then this fuction will be
> specific for virtio_net device (vi is virtnet_info) only in a generic
> virtqueue API.
> 
> Thanks
> Shirley

No, this code would be in virtio net.
destroy would simply be the virtqueue API that returns
data pointer.

-- 
MST
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