Peter P Mccann

US Patent:

6658522, Dec 2, 2003

Filed:

Jun 16, 2000

Appl. No.:

09/596295

Inventors:

Brian James Martin - Worcester MA
Peter John McCann - Mason NH

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 1200

US Classification:

711 1, 711 6, 711163, 711203, 711206, 709 1, 709103, 710 6

Abstract:

Featured is a method for reducing overhead associated with system input output (I/O) operations in a computer system having a plurality of processors and a physical memory accessed and used by the plurality of processors. The physical memory being accessed can be a global physical memory such as that used with SMP types of architectures or distributed physical memory such as that used with CCNUMA types of architectures. Such a method includes creating a pinned virtual memory range database in which is stored virtual memory address information corresponding to pinned physical memory for each applications program being run on the computer system. Also featured is an operating system for execution with a multiprocessor computer system and a multiprocessor computer including such an operating system for execution therein.

US Patent:

7062675, Jun 13, 2006

Filed:

Jun 25, 2002

Appl. No.:

10/179113

Inventors:

John N. Kemeny - Westford MA, US
Jun Ohama - Mendon MA, US
Douglas Sullivan - Milford MA, US
Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 11/00

US Classification:

714 15, 711135, 711138

Abstract:

In a storage system including a write-back cache, dirty data can be flushed from the cache while a controller continues to service host I/O requests. A controller is capable of flushing all the dirty data in the cache to a storage device in response to an indication to do so, such as an indication of impending failure. The controller is further capable of responding to I/O requests from the host during the flushing of the dirty data. In particular, the controller is capable of responding to write requests from the host system by storing data on the storage device during the flushing of the dirty data.

US Patent:

7950022, May 24, 2011

Filed:

Jun 29, 2007

Appl. No.:

11/824506

Inventors:

Christopher M. Gould - Leominster MA, US
Peter J. McCann - Mason NH, US
Jeffrey A. Brown - Shrewsbury MA, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 9/44

US Classification:

719327, 719328

Abstract:

Described are techniques for facilitating communication between device drivers. A device driver is provided that makes at least one call using an application programming interface. The application programming interface facilitates communication between the device driver module and a target code module. The application programming interface provides support for performing the at least one call from a first execution mode associated with the device driver module and a second execution mode associated with the target code module. The application programming interface provides support for user space to user space communication, user space to kernel space communication, kernel space to kernel space communication, and kernel to user space communication. The first execution mode of the device driver module and said second execution mode of the target code module are determined. A communication path between the modules is established in accordance with said first execution mode and said second execution mode.

US Patent:

8271996, Sep 18, 2012

Filed:

Sep 29, 2008

Appl. No.:

12/286493

Inventors:

Christopher M. Gould - Leominster MA, US
Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 9/54

US Classification:

719312, 719313, 719314, 719315, 719316, 719317, 719318, 719330

Abstract:

Described are techniques for communicating between one or more producers and one or more consumers. A first consumer of an event queue registers for notification regarding occurrences of one or more events. A producer of the event queue posts one or more notifications to one or more consumers of the event queue regarding one or more occurrences of one or more events. Each of the consumers receive notification regarding occurrences of events for which the consumer is registered. The first consumer retrieves posted event notifications regarding events for which the first consumer is registered. If the first consumer is executing in user space and an event notification list to which the event notifications for the first consumer are posted is located in shared memory, the first consumer retrieves the posted event notifications without proxying into kernel space.

US Patent:

8555297, Oct 8, 2013

Filed:

Sep 29, 2008

Appl. No.:

12/286433

Inventors:

Christopher M. Gould - Leominster MA, US
Peter J. McCann - Mason NH, US

Assignee:

EMC Corporation - Hopkinton MA

International Classification:

G06F 13/00

US Classification:

719330

Abstract:

Described are techniques for performing remote procedure calls (RPCs). An RPC API is described which provides for using an optimized technique and an unoptimized technique for performing RPCs. The optimized technique includes a client container performing a call to obtain RPC configuration information which is then stored by the client container and may be used by the client container in connection with multiple RPC invocations. Techniques are also described for communicating parameter information between containers executing in different address spaces by forming parameter information on the client side using embedded lists, encoding the parameter information on the client side prior to transmission to the server, and transmitting the encoded parameter information to the server which determines output parameters and returns the output parameters to the client.

US Patent:

20130042001, Feb 14, 2013

Filed:

Aug 15, 2012

Appl. No.:

13/586137

Inventors:

Christopher M. GOULD - Leominster MA, US
Peter J. MCCANN - Mason NH, US

International Classification:

G06F 15/173

US Classification:

709224

Abstract:

Described are techniques for communicating between one or more producers and one or more consumers. A first consumer of an event queue registers for notification regarding occurrences of one or more events. A producer of the event queue posts one or more notifications to one or more consumers of the event queue regarding one or more occurrences of one or more events. Each of the consumers receive notification regarding occurrences of events for which said each consumer is registered. The first consumer retrieves posted event notifications regarding events for which said first consumer is registered. If the first consumer is executing in user space and an event notification list to which said event notifications for said first consumer are posted is located in shared memory, said first consumer retrieves said posted event notifications without proxying into kernel space.