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Re: [Qemu-devel] [RFC PATCH 0/4] aio: Don't poll ioeventfd in nested aio

From: Fam Zheng
Subject: Re: [Qemu-devel] [RFC PATCH 0/4] aio: Don't poll ioeventfd in nested aio_poll()
Date: Thu, 28 May 2015 19:16:56 +0800
User-agent: Mutt/1.5.23 (2014-03-12)

On Thu, 05/28 10:21, Paolo Bonzini wrote:
> On 28/05/2015 03:46, Fam Zheng wrote:
> > The main context uses iohandler and aio_dispatch, neither calls
> > aio_set_dispatching(). However, if we have [2], they can be changed to
> > aio_poll(), then would this idea work?
> I think it's a bad idea to handle aio_poll for context B in a different
> way, just because you have an outer aio_poll for context A...

But we already do something similar: ignoring slirp, main_loop_wait() is like
an iothread aio_poll() without the "outermost differentiation", while the
current aio_poll() in bdrv_drain() is roughly "main_loop_wait() minus


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