linux-kernel - Re: [PATCH 14/18] virtio: add api for delayed callbacks

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Message-ID: <87boz3dsoe.fsf@rustcorp.com.au>
Date:	Mon, 16 May 2011 16:43:21 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Shirley Ma <xma@...ibm.com>, lguest@...ts.ozlabs.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	Krishna Kumar <krkumar2@...ibm.com>,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>, steved@...ibm.com,
	habanero@...ux.vnet.ibm.com
Subject: Re: [PATCH 14/18] virtio: add api for delayed callbacks

On Sun, 15 May 2011 15:48:18 +0300, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Mon, May 09, 2011 at 03:27:33PM +0930, Rusty Russell wrote:
> > On Wed, 4 May 2011 23:52:33 +0300, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> > > Add an API that tells the other side that callbacks
> > > should be delayed until a lot of work has been done.
> > > Implement using the new used_event feature.
> > 
> > Since you're going to add a capacity query anyway, why not add the
> > threshold argument here?
> 
> I thought that if we keep the API kind of generic
> there might be more of a chance that future transports
> will be able to implement it. For example, with an
> old host we can't commit to a specific index.

No, it's always a hint anyway: you can be notified before the threshold
is reached.  But best make it explicit I think.

Cheers,
Rusty.
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