Method to optimize effective page number to real page number translation path from page table entries match resumption of execution stream
View Patent ↗A method, system and computer program product for optimizing EPN to RPN translation when a data miss occurs. The method, system and computer program product take advantage of the high-likelihood of finding the matching PTE in the first half of the PTEG and utilize early data-coming signals from the L2 cache to prime the data-flow pipe to the D-ERAT arrays and requesting a joint steal cycle for executing the write into the D-ERAT and a restart request for re-dispatching the next-to-complete instruction.
1. A method, in a data processing system, for optimizing effective page number to real page number translation in a processor when a data miss occurs, the method comprising:
receiving notice of a data miss;
requesting a reload of a page table entry group in response to receiving the notice of the data miss;
receiving a data-coming signal, wherein the data-coming signal is received prior to the data being sent and wherein the data-coming signal is a second data-coming signal;
responsive to receiving the data-coming signal, requesting a steal cycle and a thread specific dispatch-restart; and
granting the steal cycle and the thread specific dispatch-restart.
2. The method of claim 1 further comprising:
receiving data; and
comparing the data received against a search criteria.
3. The method of claim 2 further comprising:
responsive to granting the steal cycle and the thread specific dispatch-restart and to a determination that a match for the search criteria has been found, writing an effective page number to real page number translation in a data effective to real address translation (D-ERAT).
4. The method of claim 1 , wherein he data miss comprises one of a data effective to real address translation (D-ERAT) miss or a translation look-aside buffer miss.
5. The method of claim 3 further comprising:
restarting a next-to-complete instruction.
6. The method of claim 2 wherein the search criteria comprises an abbreviated virtual page number and page attributes associated with a missing real page number.