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Method and apparatus for profiling indirect procedure calls in a computer program
| Details |
Inventors: Hanson, Scott Patrick; Schmidt, William Jon;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Trammell; James P.
Assistant Examiner: Nguyen; Cuong H.
Attorney, Agent or Firm: Martin & Associates, L.L.C., Martin; Derek P.
An apparatus and method provide more complete profile data by instrumenting indirect procedure calls in a computer program. Indirect procedure calls have a number of counters allocated in a table at each indirect call site. The counters are divided into counters in a low volatility area and counters in a high volatility area. The counters in the high volatility area have a pointer that identifies the next procedure to be replaced. As the instrumented code executes, a call to a procedure that is in the table increments the count of the counter in the table. A call to a procedure not in the table is placed in the high volatility area, displacing the procedure at the pointer, and moves the pointer to a new location. The displaced procedure is either promoted to the low volatility area, or is discarded. If promoted, the procedure that it displaces in the low volatility area is demoted to the high volatility area, displacing a procedure there at the pointer (and moving the pointer to a new location). This process continues until a displaced high volatility procedure is discarded. |
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DETAILED DESCRIPTION As discussed in the Background section, the generation of profile data for direct procedure calls is relatively straightforward.
However, the generation of profile data for indirect procedure calls is problematic, and presents challenges that have not been successfully overcome in the prior art.
The present invention provides an apparatus and method for collecting profile data at indirect call sites within a computer program.
By taking into account profiling data at indirect call sites, the ordering of procedures in a computer program will be improved, thereby enhancing the performance of the computer program.
Referring to FIG.
1, a computer system 100 in accordance with the present invention is an enhanced IBM AS/400 mid-range computer system.
However, those skilled in the art will appreciate that the mechanisms and apparatus of the present invention apply equally to any computer system, regardless of whether the computer system is a complicated multi-user computing apparatus or a single user device such as a personal computer or workstation.
Computer system 100 suitably comprises a processor 110, main memory 120, a memory controller 130, an auxiliary storage interface 140, and a terminal interface 150, all of which are interconnected via a system bus 160.
Note that various modifications, additions, or deletions may be made to the computer system 100 illustrated in FIG.
1 within the scope of the present invention such as the addition of cache memory or other peripheral devices; FIG.
1 is presented to simply illustrate some of the salient features of computer system 100.
Processor 110 performs computation and control functions of computer system 100, and comprises a suitable central processing unit.
Processor 110 may comprise a single integrated circuit, such as a microprocessor, or may comprise any suitable number of integrated circuit devices and/or circuit boards working in cooperation to accomplish the functions of a processor.
Processor 110 suitably executes a computer program 122 within main memory 120
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