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authorNilay Vaish <nilay@cs.wisc.edu>2011-01-04 21:40:49 -0600
committerNilay Vaish <nilay@cs.wisc.edu>2011-01-04 21:40:49 -0600
commitd36cc62c117c2ec37dd99b1e55f3663f4af65b8d (patch)
tree7d08abe98f96f57f98847132ceae5d2af6ee1e5a /src/cpu
parent498ea0bdab4d092a9c7dad648f80d1132fd7e145 (diff)
downloadgem5-d36cc62c117c2ec37dd99b1e55f3663f4af65b8d.tar.xz
Ruby: Updates MOESI Hammer protocol
This patch changes the manner in which data is copied from L1 to L2 cache in the implementation of the Hammer's cache coherence protocol. Earlier, data was copied directly from one cache entry to another. This has been broken in to two parts. First, the data is copied from the source cache entry to a transaction buffer entry. Then, data is copied from the transaction buffer entry to the destination cache entry. This has been done to maintain the invariant - at any given instant, multiple caches under a controller are exclusive with respect to each other.
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