1. A method of cache management in a victim cache in a cache hierarchy of a processor core, said method comprising: receiving a castout command identifying a victim cache line castout from another cache memory; thereafter, holding the victim cache line in a cache array of the victim cache; and if said another cache memory is a higher level cache in the cache hierarchy of the processor core, marking the victim cache line in the victim cache so that it is less likely to be evicted by a replacement policy of the victim cache, and otherwise, marking the victim cache line in the victim cache so that it is more likely to be evicted by the replacement policy of the victim cache.