Sun Microsystems, Inc.

Oracle America, Inc.

Nils A Nieuwejaar

Russell Alexader Blaine

Adam H Leventhal

William J Kucharski

Eric N Schrock

Edward K Pilatowicz

Methods and systems for defining the partitioning between operating system environments are provided. In this method, network resources, devices, and pseudo-filesystems, etc. can be partitioned. This method provides the capability to support services from native and foreign operating environments without colliding on fixed resources. This method simplifies the task of supporting multiple different operating environments. By assigning each operating environment to its own zone, multiple instances of a single operating environment or multiple different operating environments can be simultaneously supported on a single operating system kernel.

System for defining non-native operating environments

Methods and systems for efficiently interpreting operating system service requests on the same register or vector of a processor or CPU where the operating system service requests are initiated from native and non-native applications are provided. More particularly, a switching layer can enable processing of the operating system service requests by routing control of a particular request to an appropriate kernel subsystem or module based on the type of operating system service being requested and the type of application initiating the request. Additionally, the performance impact of the switching layer for native applications is overcome by dynamically reprogramming the processor or CPU on every change of active process so that only foreign applications are subject to the processing requirements of the switching layer.

Efficient operating system interposition mechanism

Method for defining non-native operating environments

A parallel filesystem remote access subsystem facilitates remote access to files in a parallel filesystem in a digital computer network, the network including at least one client computer and a plurality of server computers interconnected by a communication link, and each server computer storing a portion of at least one file in the parallel filesystem. The parallel filesystem remote access subsystem includes, associated with the server computer, a parallel filesystem input/output daemon, and, associated with the client computer, a parallel filesystem module and a parallel filesystem proxy daemon. The parallel filesystem module receives access requests generated to access a file in the parallel filesystem and refer the access requests to the parallel filesystem proxy daemon, and the parallel filesystem proxy daemon, in turn, generates server access request messages for transfer over the communications link. The client computer processes the parallel filesystems module in a privileged kernel mode and the parallel filesystem proxy daemon in an unprivileged user mode. The a parallel filesystem input/output daemon, which is processed in the server computer's user mode, controls processing of server access request messages received by the server computer over the communication link.

System for facilitating remote access to parallel file system in a network using priviliged kernel mode and unpriviliged user mode to avoid processing failure

Growing community of inventors

Santa Clara, CA, United States of America

Nils A Nieuwejaar