Hi All, I noticed that there are some useful comments in the file cache.cc as like these:
"// if a cache is responding, and it had the line in Owned // rather than Modified state, we need to invalidate any // copies that are not on the same path to memory " "// we get away with multiple caches (on // the same path to memory) considering // the block writeable as we always enter // the cache hierarchy through a cache, // and first snoop upwards in all other // branches" What is the meaning of "on the same path to memory"? Assume we have two cpus and 3 cache levels. The third level is shared by these two cpus. And packet is in the level 2 (L2) of cpu1 currently. If I understand it correctly, taking the first comment for example, the cache which is responding is L1 of cpu1, the "on the same path to memory" means the path from current L2 of cpu1 to to L3 to memory and the copies which need to be invalidated should be the ones from L1, L2 of cpu2 (not including the copies of L3) . Is my understanding correct? Please correct me and clarify it if not. Thanks in advance! gjins
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