Store queue with store-merging and forward-progress guarantees
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United States of America Patent
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Sep 30, 2014
Grant Date -
Jun 17, 2010
app pub date -
Dec 15, 2008
filing date -
Dec 15, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Some embodiments of the present invention provide a system that performs stores in a memory system. During operation, the system performs a store for a first thread, which involves creating an entry for the store in a store queue for the first thread. It also involves attempting to store-mark a corresponding cache line for the first thread by sending a store-mark request for the first thread to the memory system, wherein a store-mark on the cache line indicates that one or more store queue entries are waiting to be committed to the cache line. If the attempt to store-mark the cache line fails because a second thread holds a store-mark on the cache line, and if obtaining the store-mark will ensure forward progress for the first thread, the system forces the second thread to release the store-mark, so the first thread can acquire a store-mark for the cache line.
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