Glauber Costa wrote:
On Wed, Sep 10, 2008 at 10:26 AM, Chris Lalancette <[EMAIL PROTECTED]> wrote:
Anthony Liguori wrote:
This patch adds a bdrv_flush_all() function. It's necessary to ensure that all
IO operations have been flushed to disk before completely a live migration.
N.B. we don't actually use this now. We really should flush the block drivers
using an live savevm callback to avoid unnecessary guest down time.
Simple enough, and follows the pattern in the KVM migration.
Chris Lalancette
sounds ok.
I'm actually liking bdrv_flush_all() less and less. If there are any
outstanding IO requests, it will increase the down time associated with
live migration. I think we definitely need to add a live save handler
that waits until there are no outstanding IO requests to converge. I'm
concerned though that it's not totally unreasonable to expect a guest to
always have an IO request in flight. That leads me to think that maybe
we should be cancelling outstanding requests, and somehow saving their
state?
Regards,
Anthony Liguori
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