John Luke Stevenson

US Patent:

20110235777, Sep 29, 2011

Filed:

Feb 23, 2011

Appl. No.:

13/033590

Inventors:

Tsahi Gozani - Palo Alto CA, US
Joseph Bendahan - San Jose CA, US
Craig Mathew Brown - Santa Clara CA, US
Willem Gerhardus Johannes Langeveld - Menlo Park CA, US
John David Stevenson - Livermore CA, US

International Classification:

G01N 23/06

US Classification:

378 53

Abstract:

The application discloses systems and methods for X-ray scanning for identifying material composition of an object being scanned. The system includes at least one X-ray source for projecting an X-ray beam on the object, where at least a portion of the projected X-ray beam is transmitted through the object, and an array of detectors for measuring energy spectra of the transmitted X-rays. The measured energy spectra are used to determine atomic number of the object for identifying the material composition of the object. The X-ray scanning system may also have an array of collimated high energy backscattered X-ray detectors for measuring the energy spectrum of X-rays scattered by the object at an angle greater than 90 degrees, where the measured energy spectrum is used in conjunction with the transmission energy spectrum to determine atomic numbers of the object for identifying the material composition of the object.

US Patent:

20120155592, Jun 21, 2012

Filed:

Feb 25, 2011

Appl. No.:

13/035886

Inventors:

Tsahi Gozani - Palo Alto CA, US
Michael Joseph King - Hillsborough CA, US
Timothy John Shaw - Oakland CA, US
John David Stevenson - Livermore CA, US

International Classification:

G01T 3/00

US Classification:

376154

Abstract:

The present specification discloses a system for detecting nuclear material based on at least one source of probing radiation and the radiation signatures generated from interrogating an object under inspection. In addition, the present specification describes a threshold-activation detector capable of detecting prompt neutrons, via the activation, after the source's blinding radiation has stopped. The threshold-activation detector can be manufactured from liquid fluorocarbons that allow for the detection of beta radiation and gamma rays.

US Patent:

20230130274, Apr 27, 2023

Filed:

Oct 21, 2021

Appl. No.:

17/507635

Inventors:

- San Francisco CA, US
John Peter Stevenson - San Francisco CA, US
Yaxiong Zhao - San Francisco CA, US

International Classification:

G06F 9/54
G06F 21/54

Abstract:

High-throughput BPF map manipulations with uprobes are disclosed. A method for manipulating a Berkeley Packet Filter (BPF) map comprises running a user program in a user space of a computing environment. The user program includes a trigger function. A corresponding kernel BPF probe is installed by the user program on the trigger function. The kernel BPF probe is triggered by reaching a memory address of the trigger function in the user space. The trigger function includes one or more arguments that the BPF map agent interprets as operation parameters. The BPF map agent performs one or more operations to manipulate a BPF map in the kernel space based on the operation parameters.

US Patent:

20200004677, Jan 2, 2020

Filed:

Jun 27, 2018

Appl. No.:

16/020444

Inventors:

- Santa Clara CA, US
Omid Azizi - Redwood City CA, US
Chandan Egbert - San Jose CA, US
David Hansen - Santa Clara CA, US
Andreas Kleen - Portland OR, US
Mahesh Maddury - Santa Clara CA, US
Mahesh Madhav - Portland OR, US
Alexandre Solomatnikov - San Carlos CA, US
John Peter Stevenson - Chicago IL, US

International Classification:

G06F 12/02
G06F 12/1009
G06F 3/06

Abstract:

Processing circuitry for computer memory management includes memory reduction circuitry to implement a memory reduction technique; and reference count information collection circuitry to: access a memory region, the memory region subject to the memory reduction technique; obtain an indication of memory reduction of the memory region; calculate metrics based on the indication of memory reduction of cache lines associated with the memory region; and provide the metrics to a system software component for use in memory management mechanisms.

US Patent:

20180004668, Jan 4, 2018

Filed:

Jun 30, 2016

Appl. No.:

15/199587

Inventors:

- Santa Clara CA, US
Alexandre Y. SOLOMATNIKOV - San Carlos CA, US
Amin FIROOZSHAHIAN - Mountain View CA, US
John P. STEVENSON - Palo Alto CA, US
Mahesh MADDURY - San Jose, US

International Classification:

G06F 12/0846
G06F 12/0804

Abstract:

A searchable hot content cache stores frequently accessed data values in accordance with embodiments. In one embodiment, a circuit includes interface circuitry to receive memory requests from a processor. The circuit includes hardware logic to determine that a number of the memory requests that is to access a value meets or exceeds a threshold. The circuit includes a storage array to store the value in an entry based on a determination that the number meets or exceeds the threshold. In response to receipt of a memory request from the processor to access the same value at a memory address, the hardware logic is to map the memory address to the entry of the storage array.