摘要:
A technique for cache coherency is provided. A cache controller selects a first set from multiple sets in a congruence class based on a cache miss for a first transaction, and places a lock on the entire congruence class in which the lock prevents other transactions from accessing the congruence class. The cache controller designates in a cache directory the first set with a marked bit indicating that the first transaction is working on the first set, and the marked bit for the first set prevents the other transactions from accessing the first set within the congruence class. The cache controller removes the lock on the congruence class based on the marked bit being designated for the first set, and resets the marked bit for the first set to an unmarked bit based on the first transaction completing work on the first set in the congruence class.
摘要:
Embodiments relate to a method for bitline deletion include, based on detecting a high bitline error rate condition in the cache at a selected bitline address, wherein the high bitline error rate condition indicates a high rate of errors at the selected bitline address, activating the programmable switch in the cache. The method also includes, based on the programmable switch being activated and encountering an error associated with the selected bitline address, automatically deleting, by the computer system, one or more cache lines associated with subsequent errors in the cache regardless of an address of the subsequent errors based on the activated programmable switch, wherein the automatic line deletion indicates a line is unavailable.