Arrangements and method for enabling and disabling cache bypass in a
computer system with a cache hierarchy. Cache bypass status is identified
with respect to at least one cache line. A cache line identified as cache
bypass enabled is transferred to one or more higher level caches of the
cache hierarchy, whereby a next higher level cache in the cache hierarchy
is bypassed, while a cache line identified as cache bypass disabled is
transferred to one or more higher level caches of the cache hierarchy,
whereby a next higher level cache in the cache hierarchy is not bypassed.
Included is an arrangement for selectively enabling or disabling cache
bypass with respect to at least one cache line based on historical cache
access information.