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 computer program product in a computer recordable-type media for optimizing effective page number to real page number translation in a processor when a data miss occurs, comprising:
first instructions for receiving notice of the data miss;
second instructions for requesting a reload of a page table entry group in response to receiving the notice of the data miss;
third instructions for 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;
fourth instructions, responsive to receiving the data coming signal, for requesting a steal cycle and a thread specific dispatch-restart; and
fifth instructions for granting the steal cycle and the thread specific dispatch-restart.
2. The computer program product of claim 1 further comprising:
sixth instructions for receiving data; and
seventh instructions for comparing the data received against a search criteria.
3. The computer program product of claim 2 further comprising:
eighth instructions, 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, for writing an effective page number to real page number translation in a data effective to real address translation.
4. The computer program product of claim 1 , wherein the data miss comprises one of a data effective to real address translation miss or a translation look-aside buffer miss.
5. The computer program product of claim 3 further comprising:
ninth instructions for restarting a next-to-complete instruction.
6. The computer program product of claim 2 wherein the search criteria comprises an abbreviated virtual page number and page attributes associated with a missing real page number.
7. A data processing system for optimizing effective page number to real page number translation in a processor when a data miss occurs, comprising:
receiving mechanism for receiving notice of the data miss;
requesting mechanism for requesting a reload of a page table entry group in response to receiving the notice of the data miss;
receiving mechanism for 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; and
requesting mechanism, responsive to receiving the data coming signal, for requesting a steal cycle and a thread specific dispatch-restart; and
granting mechanism for granting the steal cycle and the thread specific dispatch-restart.
8. The data processing system of claim 7 further comprising:
receiving mechanism for receiving data; and
comparing mechanism for comparing the data received against a search criteria.
9. The data processing system of claim 8 further comprising:
writing mechanism, 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, for writing an effective page number to real page number translation in a data effective to real address translation.
10. The data processing system of claim 7 , wherein the data miss comprises one of a data effective to real address translation miss or a translation look-aside buffer miss.
11. The data processing system of claim 9 further comprising:
restarting mechanism for restarting a next-to-complete instruction.
12. The data processing system of claim 8 wherein the search criteria comprises an abbreviated virtual page number and page attributes associated with a missing real page number.