Efficient trace method adaptable to multiprocessors

Details Efficient trace method adaptable to multiprocessors Efficient trace method adaptable to multiprocessors

1983-06-29

1986-07-01

Thomas, James D.

Boots, shoes, and leggings

364200, G06F 1130

Patent

active

045983640

ABSTRACT:
The disclosure describes a separate trace table for each CPU in an MP to avoid inter-CPU interference in making trace table entries for explicit and implicit tracing instructions enabled by flag bits in a control register (CR). Explicit tracing entries are made for an enabled explicit tracing instruction. Implicit tracing entries are made for predetermined instructions (when enabled for tracing) which do not have tracing as their primary purpose. A storage operand of the trace instruction contains a disablement field and optionally may contain an enablement-controlling class field to improve the integrity of traceable programs. A time stamp and range of general register contents is provided in each trace table entry for a tracing instruction. The time stamp enables all trace tables in an MP system to be later merged into a single trace table whenever required.

REFERENCES:
patent: 4205370 (1980-05-01), Hirtle
patent: 4268904 (1981-05-01), Suzuki et al.
patent: 4435759 (1984-03-01), Baum et al.
patent: 4462077 (1984-07-01), York
Birney et al, "Trace", IBM Technical Disclosure Bulletin, vol. 20, No. 7, Dec. 1977, pp. 2561-2562.

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