These parameters control the poll time self-tuning algorithm.  They are
optional and will default to sane values if omitted.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Message-id: 20161201192652.9509-14-stefanha@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>