the attached patch fixes long scheduling latencies in select_parent()
and prune_dcache(). The prune_dcache() lock-break is easy, but for
select_parent() the only viable solution i found was to break out if
there's a resched necessary - the reordering is not necessary and the
dcache scanning/shrinking will later on do it anyway.

This patch has been in the -VP patchset for weeks.

	Ingo