Method and apparatus for enabling an interpretive execution subs

Details Method and apparatus for enabling an interpretive execution subs Method and apparatus for enabling an interpretive execution subs

1990-10-23

1994-05-31

Lall, Parshotam S.

Boots, shoes, and leggings

3642282, 3642462, 3642463, 3642564, 364DIG1, G06F 946

Patent

active

053177541

ABSTRACT:
An apparatus and method are established for recognizing guest virtual machines which require only a subset of interpretive execution facilities. The interpretive execution initialization process recognizes subset candidates and bypasses initialization of those facilities not required by the candidates. The candidates are typically short duration jobs and a reduction of initialization and termination overhead creates a substantial performance improvement. The translation lookaside buffer operation is modified to flag subset guest entries as host entries and to associate a unique segment table origin with each subset guest. This allows the TLB entries to remain between guest machine dispatches eliminating TLB purge time and allowing potential reuse of TLB entries if the same guest is repeatedly dispatched within a short time period. The guest machine state description is modified to flag subset candidates based on address translation and timing requirements. Initialization of timing facilities is bypassed in certain subset modes further reducing initialization overhead.

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