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Date: Thu, 14 Mar 2013 10:29:42 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130314092942.GA9507@stefanha-thinkpad.redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH 0/2] port network layer onto glib
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: mdroth <mdroth@linux.vnet.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Liu Ping Fan <qemulist@gmail.com>, qemu-devel@nongnu.org

On Wed, Mar 13, 2013 at 12:52:11PM -0500, Anthony Liguori wrote:
> Paolo Bonzini <pbonzini@redhat.com> writes:
> 
> > Il 13/03/2013 18:23, Anthony Liguori ha scritto:
> >> I think the nesting is also a bit strange.
> >
> > Nesting's gone since we added coroutines. :)
> 
> Okay, I owe AioContext a deeper look then.

We still have one level of nesting - the mainloop vs the AioContext
aio_pool().

After all, we still have synchronous I/O operations like bdrv_read()
where the file descriptors and BHs only execute in the AioContext
aio_poll and other mainloop concepts are suspended (iohandlers, timers,
slirp).

We need to do something about mainloop vs AioContext.  There should only
be one interface to add a file descriptor, today we have iohandler and
aio.

Stefan