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Re: [Qemu-devel] [PATCH] Use qemu_eventfd for POSIX AIO

From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH] Use qemu_eventfd for POSIX AIO
Date: Tue, 27 Sep 2011 17:11:40 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

On 09/27/2011 05:07 PM, Anthony Liguori wrote:

You don't expect to handle EAGAIN with eventfd() whereas you have to handle it with pipe().

Moreover, the eventfd() counter is not lossy (practically speaking) whereas if you use pipe() as a counter, it will be lossy in practice.

This is why posix aio uses pipe() and not eventfd().

We could define a qemu_event mechanism that satisfies the least common denominator, and is implemented by eventfd when available.

qemu_event_poll_add() // registers in main loop

error compiling committee.c: too many arguments to function

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