Method and apparatus for supporting one or more servers on a single semiconductor chip
One embodiment of the present invention provides a system that facilitates avoiding locks by speculatively executing critical sections of code. During operation, the system allows a process to speculatively execute a critical section of code within a program without first acquiring a lock associated with the critical section. If the process subsequently completes the critical section without encountering an interfering data access from another process, the system commits changes made during the speculative execution, and resumes normal non-speculative execution of the program past the critical section. Otherwise, if an interfering data access from another process is encountered during execution of the critical section, the system discards changes made during the speculative execution, and attempts to re-execute the critical section.
1. An apparatus for supporting one or more servers on a single semiconductor chip, comprising:
a plurality of first-level translation lookaside buffers on the single semiconductor chip, wherein each first-level translation lookaside buffer is associated with a processor core of a plurality of processor cores on the single semiconductor chip; and
a second-level translation lookaside buffer that is coupled to the plurality of first-level translation lookaside buffers, wherein the second-level translation lookaside buffer stores a subset of the entries in the plurality of first-level translation lookaside buffers;
wherein an access to a page table entry in main memory by a processor core associated with a first-level translation lookaside buffer can be stored in the second-level translation lookaside buffer before being forwarded to the first-level translation buffer associated with the processor that requested the page table entry;
whereby storing the page table entry in the second-level translation lookaside buffer eliminates a need to refer to main memory to access the same page table entry if another processor requests the same page table entry.