Hewlett-packard Development Company, L.P.

Lacky Shah

William B Buzbee

James S Mattson

Salil Pradhan

Umesh Krishnaswamy

The present invention relates to a mechanism for adaptive run time compilation of traces of program code to achieve efficiency in compilation and overall execution. The mechanism uses a combination of interpretation and compilation in executing byte code. The mechanism selects code segments for compilation based upon frequency of execution and ease of compilation. The inventive mechanism is able to compile small code segments, which can be a subset of a method or subroutine, and comprising only single path execution. The mechanism thereby achieves efficiency in compilation by having less total code as well as having only straight line, or single path execution, code to compile.

Method and apparatus for trace based adaptive run time compiler

A blocking system intercepts communications between a software program and an operating system in order to handle blocking and unblocking of event signals. The blocking system intercepts system calls to the operating system requesting the blocking and unblocking of event signals and keeps track of which event signals are blocked and unblocked without delivering the system calls to the operating system. The blocking system also intercepts event signals from the operating system and only allows unblocked event signals to pass to the software program. Blocked event signals received by the blocking system are discarded until the program unblocks the blocked event signals. After unblocking an event signal, the blocking system determines whether a corresponding event signal was previously received and blocked. If so, the blocking system transmits a signal indicating that the event corresponding to the event signal occurred.

System and method for efficiently blocking event signals associated with an operating system

The present invention is a system and method of using a kernel module to perform dynamic optimizations both of user programs and of the computer operating system kernel, itself. The kernel module permits optimized translations to be shared across a computer system without emulation because the kernel module has the privileges necessary to write into the computer program text in shared user memory space. In addition, the kernel module can be used to optimize the kernel itself because it, too, is located in the kernel memory space.

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Sunnyvale, CA, United States of America

Lacky Shah