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

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] qemu virtIO blocking operation - question
Date: Tue, 13 Sep 2011 10:12:48 +0100

On Mon, Sep 12, 2011 at 10:05 PM, Sinha, Ani <address@hidden> wrote:
> 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.

There is, you can use GThreadPool.


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