Re: [Qemu-devel] qemu virtIO blocking operation - question

[Sinha, Ani]

On Sep 11, 2011, at 6:34 AM, Stefan Hajnoczi wrote:

>
> You may find these posts I wrote helpful, they explain vcpu threads and
> the I/O thread:
> http://blog.vmsplice.net/2011/03/qemu-internals-big-picture-overview.html
> http://blog.vmsplice.net/2011/03/qemu-internals-overall-architecture-and.html
>


"One example user of worker threads is posix-aio-compat.c, an asynchronous file 
I/O implementation. When core QEMU issues an aio request it is placed on a 
queue. Worker threads take requests off the queue and execute them outside of 
core QEMU. They may perform blocking operations since they execute in their own 
threads and do not block

Another example is ui/vnc-jobs-async.c which performs compute-intensive image 
compression and encoding in worker threads."


I wonder why there isn't a general framework for this? Some thread that would 
take requests off a queue and process them without knowing the internals of the 
request.

Ani


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