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Re: [Qemu-block] [PATCH v4 3/3] aio: Introduce aio-epoll.c
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-block] [PATCH v4 3/3] aio: Introduce aio-epoll.c |
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Date: |
Fri, 30 Oct 2015 10:07:24 +0000 |
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User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Fri, Oct 30, 2015 at 12:06:29PM +0800, Fam Zheng wrote:
> To comply with aio_{disable,enable}_external, we always use ppoll when
> aio_external_disabled() is true.
All file descriptors are added to the epoll fd. Does that mean epoll
will report the same fds again after we come out of
ppoll()/aio_external_disabled()?
The two constraints to think about:
1. Ideally there should be no duplicated events.
2. There absolutely cannot be any missed events.
Stefan
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