linux-kernel - Re: [PATCHv2 06/14] virtio: add api for delayed callbacks

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Message-ID: <87mxigu6io.fsf@rustcorp.com.au>
Date:	Sat, 21 May 2011 12:03:35 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
Cc:	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,
	linux-kernel@...r.kernel.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: [PATCHv2 06/14] virtio: add api for delayed callbacks

On Fri, 20 May 2011 02:11:14 +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 event_idx feature.
> 
> Note: it might seem advantageous to let the drivers
> ask for a callback after a specific capacity has
> been reached. However, as a single head can
> free many entries in the descriptor table,
> we don't really have a clue about capacity
> until get_buf is called. The API is the simplest
> to implement at the moment, we'll see what kind of
> hints drivers can pass when there's more than one
> user of the feature.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>

Yes, I've applied this (and the next one which uses it in virtio_net),
despite my reservations about the API.  But that is fixable...

Thanks,
Rusty.
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