Re: [Qemu-devel] 答复: Re: 答复: Re: [PATCHv2 02/04] colo-compare: Process pactkets in the IOThread ofthe primary

[Stefan Hajnoczi]

On Thu, Jun 15, 2017 at 12:23:27PM +0800, Jason Wang wrote:
> Paolo, Marc and Stefan:
> 
> We want let chardev front-end run in colo comparing IOThread. This looks not
> supported by current chardev frontend API. Any idea/suggestion on how to
> achieve this?

I'm not very familiar with chardev but a quick look suggests that the
subsystem uses the glib event loop (GMainContext) APIs.

IOThread uses QEMU's AioContext event loop and does not run a
GMainContext.

main-loop.c has an AioContext but also a GMainContext.  It runs the
GMainContext event loop and integrates AioContext into that event loop.

Today chardev and IOThread cannot work together.  chardev only works in
the main loop because the implicit NULL GMainContext is used by the
code.

It may be possible to unify main-loop.c and AioContext so that every
AioContext also has a GMainContext.  I don't know how difficult that
will be.

Unification must not decrease AioContext performance.  Benchmarks would
be necessary.

Stefan

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