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公开(公告)号：CA2137488A1
公开(公告)日：1995-08-19
申请号：CA2137488
申请日：1994-12-07
Applicant: IBM
Inventor： BAUM RICHARD I , BRENT GLEN A , GHAFIR HATEM M , IYER BALAKRISHNA R , NARANG INDERPAL S , RAO GURURAJ S , SCALZI CASPER A , SHARMA SATYA P , SINHA BHASKAR , WILSON LEE H
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公开(公告)号：CA2137488C
公开(公告)日：1998-09-29
申请号：CA2137488
申请日：1994-12-07
Applicant: IBM
Inventor： BAUM RICHARD I , BRENT GLEN A , GHAFIR HATEM M , IYER BALAKRISHNA R , NARANG INDERPAL S , RAO GURURAJ S , SCALZI CASPER A , SHARMA SATYA P , SINHA BHASKAR , WILSON LEE H
Abstract: A coexecutor for executing functions offloaded from central processors (CPs) in a data processing system, as requested by one or more executing control programs, which include a host operating system (host OS), and subsystem program s and applications executing under the host OS. The offloaded functions are embodied in code modules. Code modules execute in the coexecutor in parallel with non-offloaded functions being executed by the CPs. Thus, the CPs do not need to execute functions which can be executed by the coexecutor. CP requests to the coexecutor specify the code modules which are accessed by the coexecutor from host shared storage under the same constraints and access limitations as th e control programs. The coexecutor may emulate host dynamic address translation, and may use a provided host storage key in accessing host storage. The restricted access operating state for the coexecutor maintains data integrity. Coexecutors can be of the same architecture or of a totally different architecture from the CPs to provide an efficient processing environment for the offloaded functions. The coexecutor interfaces host software which provides the requests to the coexecutor. Offloaded modules, once accessed by the coexecutor, may be cached in coexecutor local storage for use by future requests to allow subsequent invocations to proceed without waiting to again load the same module.
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