Upward eviction of cache lines

A computer-implemented method of up-eviction in a cache hierarchy, the method comprising:

• storing cache lines evicted from a first processor group into a first cache;
• down-evicting cache lines from the first cache into a second cache below the first cache in the cache hierarchy;
• storing cache lines evicted from a second processor group into the second cache;
• up-evicting a first cache line from the second cache to the first cache in response to an eviction of a second cache line from the second processor group to the second cache, wherein the second cache line is evicted from the second processor group into the second cache;
• receiving a request for the first cache line from the second processor group;
• and
• providing the up-evicted first cache line from the first cache to the second processor group in response to the request for the first cache line from the second processor group.

A wireless communication device comprising:

• a transceiver;
• a first processor group;
• a second processor group;
• a first cache that is shared by the first processor group, the first cache having a first cache controller;
• a second cache that is shared by the second processor group, the second cache having a second cache controller;
• and
• the first cache controller configured to store cache lines evicted from the first processor group into the first cache and to down-evict cache lines from the first cache to the second cache;
• the second cache controller configured to store cache lines evicted from the second processor group into the second cache;
• the second cache controller configured to up-evict a first cache line from the second cache to the first cache in response to an eviction of a second cache line from the second processor group to the second cache;
• and
• the second cache controller configured to provide the up-evicted first cache line from the first cache to the second processor group in response to a request from the second processor for the first cache line.