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Date: Thu, 14 Mar 2013 15:18:02 +0100
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH 0/2] port network layer onto glib
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To: liu ping fan <qemulist@gmail.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, "Michael S. Tsirkin" <mst@redhat.com>, mdroth <mdroth@linux.vnet.ibm.com>, Anthony Liguori <anthony@codemonkey.ws>, qemu-devel@nongnu.org

Il 14/03/2013 15:08, liu ping fan ha scritto:
> On Wed, Mar 13, 2013 at 6:58 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> Il 13/03/2013 06:59, Liu Ping Fan ha scritto:
>>> These series aim to port network backend onto glib, and
>>> prepare for moving towards making network layer mutlit-thread.
>>> The brief of the whole aim and plan is documented on
>>> http://wiki.qemu.org/Features/network_reentrant
>>>
>>> In these series, attach each NetClientState with a GSource
>>> At the first, I use AioContext instead of GSource, but after discussion,
>>> I think with GSource, we can integrated with glib more closely.
>>
>> Integrating with glib by itself is pointless.  What is the *benefit*?
>>
>> We have a pretty good idea of how to make multithreaded device models
>> using AioContext, since we are using it for the block layer and
>> virtio-blk dataplane.  Doing the same work twice, on two different
>> frameworks, doesn't seem like a very good idea.
>>
> One thing is that AioContext lacks of something which can handle
> IOCanReadHandler.

See reply to Anthony.  io_flush is very similar to that.  Right now it
affects both reading and writing, but I think it wouldn't be a problem
to make it affect io_read only.

Paolo