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Bratanov
Stanislav V. Bratanov, Nizhniy Novgorod RU
| Patent application number | Description | Published |
|---|---|---|
| 20090271801 | Split stage call sequence restoration method - Embodiments of the present invention provide for collecting a minimal subset of task execution context in real time and for restoring the task execution context and performing procedure frame unwinding operations at a post-processing stage. A first data structure may be constructed in real time to contain procedure linkage information along with references to the memory area or to a processor register context where each procedure linkage information element (procedure return address or a procedure frame pointer) was originally found. Procedure return addresses may be determined by decoding the instruction preceding the address in question and checking if it is a procedure call instruction. Procedure return addresses may also be determined using other methods (e.g., by checking whether the memory region the address in question belongs to is executable) if the probability of retrieving the correct result is acceptable for a particular area of application of an embodiment of the present invention. Procedure frame pointers may be determined as the conventional memory area elements whose value points back to the conventional memory area. Procedure frame pointers, depending on particular processor architecture, may also have other properties that differentiate them from other elements of the conventional memory area. The conventional memory area for purposes of the present invention may be non-contiguous. The contents of first data structure may then be employed in reconstruction of the task execution environment at the post-processing stage. Then, the procedure frame unwinding operations may be performed over the restored task execution context. | 10-29-2009 |
Stanislav V. Bratanov, Nizhny Novgorod RU
| Patent application number | Description | Published |
|---|---|---|
| 20090222803 | Efficient call sequence restoration method - Embodiments of the present invention provide for minimizing the number of procedure frame unwinding operations to be performed when restoring the program control flow information. A first data structure may be constructed to contain procedure linkage information along with references to the conventional memory area where each procedure linkage information element (procedure return address or a procedure frame pointer) was originally found. The first data structure may be initialized upon the initial request for program control flow information. Upon each subsequent request, the contents of the conventional memory area as referenced by the first data structure may be compared with the corresponding elements of the first data structure. As a result of said comparison, changed and unchanged regions within the conventional memory area may be determined. Then, procedure frame unwinding operations may be performed for the changed regions. Procedure linkage information collected during the frame unwinding operations may be stored in a second data structure along with references to the original locations within the conventional memory area. The second data structure may then be extended with procedure linkage information pertaining to the unchanged regions from the first data structure. Once the second data structure is constructed, it may be substituted for the first data structure to be employed in processing subsequent requests for program control flow information. | 09-03-2009 |
Stanislav Viktorovich Bratanov, Nizhniy Novgorod RU
| Patent application number | Description | Published |
|---|---|---|
| 20100235836 | METHOD OF EXTERNAL PERFORMANCE MONITORING FOR VIRTUALIZED ENVIRONMENTS - Embodiments of the present invention provide for performance monitoring of virtualized environments by establishing external performance monitoring (in a primary domain) of a virtual machine manager in whose context a virtual machine operates, and simultaneously capturing information on the virtual machine execution states. In accordance with an embodiment of the present invention, the execution states may comprise any combination of a virtualized processor index, execution address, program (task) identifier, and a timestamp. In one embodiment, a primary domain performance monitoring component may initiate time- or event-based profiling of the virtual machine, and a hypervisor may report the virtualized execution states to the performance monitoring component upon reception of each profiling interrupt. Alternatively, the time-based profiling may be initiated in the virtual machine domain. In this case, the hypervisor or virtual machine manager may enable access from within the virtual machine to performance characteristics collected in the primary domain, or communicate the execution states to the external monitoring component upon reception of each profiling interrupt or upon a change in the virtualized execution states. Performance information collected in the primary domain may then be correlated with the execution states of the virtual machine. | 09-16-2010 |