Abstract: Tracing computer software program execution includes copying a software instruction at an instrumentation point within an original instruction stream, and replacing the software instruction with a jump instruction. The jump instruction branches to a multi-level trampoline that includes at least a first-level trampoline specific to an associated software tracing probe, and a second-level trampoline generic to plural software tracing probes. The first-level trampoline preserves partial CPU state and branches to the second-level trampoline, passing it software tracing probe identifying information. The second-level trampoline preserves a remainder of the CPU state, implements software tracing operations in accordance with the software tracing probe, restores the CPU state that it previously preserved, and returns program control to the first-level trampoline. Either the first-level or second-level trampoline may execute or emulate the original instruction.

Abstract: Tracing computer software program execution includes copying a software instruction at an instrumentation point within an original instruction stream, and replacing the software instruction with a jump instruction. The jump instruction branches to a multi-level trampoline that includes at least a first-level trampoline specific to an associated software tracing probe, and a second-level trampoline generic to plural software tracing probes. The first-level trampoline preserves partial CPU state and branches to the second-level trampoline, passing it software tracing probe identifying information. The second-level trampoline preserves a remainder of the CPU state, implements software tracing operations in accordance with the software tracing probe, restores the CPU state that it previously preserved, and returns program control to the first-level trampoline. Either the first-level or second-level trampoline may execute or emulate the original instruction.

Abstract: An application is modified during execution by a hotpatch controller of a kernel receiving one or more new versions of a selection of one or more functions of multiple functions of an application and at least one selection criteria for applying the one or more new versions to the application during execution of the application to update a selection of one or more existing versions of the one or more functions. The hotpatch controller selectively transfers control from the selection of one or more existing versions of the one or more functions to the one or more new versions for only a selection of one or more processes that call the selection of one or more existing versions of the one or more functions from among multiple processes of the application, the selection of one or more processes each comprising one or more attributes matching the at least one selection criteria.

Abstract: An application is modified during execution by a hotpatch controller of a kernel receiving one or more new versions of a selection of one or more functions of multiple functions of an application and at least one selection criteria for applying the one or more new versions to the application during execution of the application to update a selection of one or more existing versions of the one or more functions. The hotpatch controller selectively transfers control from the selection of one or more existing versions of the one or more functions to the one or more new versions for only a selection of one or more processes that call the selection of one or more existing versions of the one or more functions from among multiple processes of the application, the selection of one or more processes each comprising one or more attributes matching the at least one selection criteria.

Abstract: An application is modified during execution by a hotpatch controller of a kernel receiving one or more new versions of a selection of one or more functions of multiple functions of an application and at least one selection criteria for applying the one or more new versions to the application during execution of the application to update a selection of one or more existing versions of the one or more functions. The hotpatch controller selectively transfers control from the selection of one or more existing versions of the one or more functions to the one or more new versions for only a selection of one or more processes that call the selection of one or more existing versions of the one or more functions from among multiple processes of the application, the selection of one or more processes each comprising one or more attributes matching the at least one selection criteria.

Abstract: An application is modified during execution by a hotpatch controller of a kernel receiving one or more new versions of a selection of one or more functions of multiple functions of an application and at least one selection criteria for applying the one or more new versions to the application during execution of the application to update a selection of one or more existing versions of the one or more functions. The hotpatch controller selectively transfers control from the selection of one or more existing versions of the one or more functions to the one or more new versions for only a selection of one or more processes that call the selection of one or more existing versions of the one or more functions from among multiple processes of the application, the selection of one or more processes each comprising one or more attributes matching the at least one selection criteria.