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From: | Anthony Liguori |
Subject: | [Qemu-devel] Re: Live migration broken when under heavy IO |
Date: | Tue, 16 Jun 2009 07:57:21 -0500 |
User-agent: | Thunderbird 2.0.0.21 (X11/20090320) |
Avi Kivity wrote:
Yes, that's even better (though without linux-aio, it's equivalent).
Not absolutely equivalent. There many be queued requests that haven't yet been dispatched to the thread pool, but yeah, I understand what you mean.
The tricky bit is that this has to happen at the device layer because the opaques cannot be saved in a meaningful way.Do you mean the device has to record all cancelled requests and replay them? I think we can do it at the block layer (though we have to avoid it for nested requests).
In order to complete the requests, you have to call a callback and pass an opaque with the results. The callback/opaque cannot be saved in the block layer in a meaningful way.
-- Regards, Anthony Liguori
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