block/mirror: Sleep periodically during bitmap scanning
Before, we only yield after initializing dirty bitmap, where the QMP command would return. That may take very long, and guest IO will be blocked. Add sleep points like the later mirror iterations. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NWen Congyang <wency@cn.fujitsu.com> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Message-id: 1431486673-19280-1-git-send-email-famz@redhat.com Signed-off-by: NJeff Cody <jcody@redhat.com>
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