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Date: Sat, 24 Jan 2009 12:47:16 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: [Qemu-devel] Re: A new direction for vmchannel?
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To: Gleb Natapov <gleb@redhat.com>
Cc: Eric Van Hensbergen <ericvanhensbergen@us.ibm.com>, Chris Wright <chrisw@redhat.com>, kvm-devel <kvm@vger.kernel.org>, Eric Van Hensbergen <ericvh@gmail.com>, Dor Laor <dlaor@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>

Gleb Natapov wrote:
> On Sat, Jan 24, 2009 at 11:52:06AM -0600, Anthony Liguori wrote:
>   
>>> For use cases where you are exposing metadata from the host to the guest
>>> this would be a very convenient approach indeed. As asked elsewhere in this
>>> thread, my main thought would be about how well it suits a application that
>>> wants a generic stream based connection between host & guest ? 
>>> Efficient integration into a poll(2) based event loop would be key to 
>>> that.
>>>       
>> You mean for a very large number of files (determining which property  
>> has changed?).
>>
>>     
> I think what Daniel means is that for file to have stream semantic it is
> not enough to ignore offset on read/write, but poll also should behave
> similar to how it behaves with char device fd. With regular files poll
> will always report that fd is ready for I/O.
>   

I'm not really sure, but given the 9P protocol, I suspect it would have 
to.  Eric?

Regards,

Anthony Liguori

> --
> 			Gleb.
>