US 11,892,949 B2Granted

Reducing cache transfer overhead in a system

AssigneeInternational Business Machines Corporation

InventorsChristian Zoellin, Christian Jacobi, Chung-Lung K. Shum, Martin Recktenwald, Anthony Saporito, Aaron Tsai

Life of this patent

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Abstract

A method and a system detects a cache line as a potential or confirmed hot cache line based on receiving an intervention of a processor associated with a fetch of the cache line. The method and system include suppressing an action of operations associated with the hot cache line. A related method and system detect an intervention and, in response, communicates an intervention notification to another processor. An alternative method and system detect a hot data object associated with an intervention event of an application. The method and system can suppress actions of operations associated with the hot data object. An alternative method and system can detect and communicate an intervention associated with a data object.

Claims20

Dependent claims

A method for managing data object contention in a computing system, the method comprising:

receiving an intervention notification associated with a first request to obtain a first copy of a first data object, the first request associated with a first computing application, among a plurality of computing applications included in the computing system;
recording, based at least in part on receiving the intervention notification, a first hot object status indicating that the first data object is a potential hot data object;
suppressing, based at least in part on the recorded first hot object status indicating that the first data object is a potential hot data object, an action associated with performing an operation associated with the first data object;
receiving the first request;
determining that the first request is associated with a read-only use of the first data object;
determining that a second computing application, among the plurality of computing applications, has the first copy of the first data object;
determining that a usage status of the first copy of the first data object comprises a read-only status, and demoting the usage status from read/write status to the read-only status;
and
communicating, based at least in part on the first request associated with the read-only use of the first copy of the first data object and the first copy of the first data object having the read-only status, a notification that the first request did not cause an intervention associated with the first copy of the first data object.

6 more elements

A system for managing data object contention, the system comprising:

a first computer, among a plurality of computers included in the system;
a second computer, among the plurality of computers included in the system;
a first data object;
and
a first computing application, included in the first computer;
wherein the first computer is configured to:
receive an intervention notification associated with a first request to obtain a first copy of the first data object and, in response to receiving the intervention notification, to record a first hot object status indicating that the first data object is a potential hot data object;
determine an action associated with the first application processing the first data object;
and
suppress the action based, at least in part, on the first hot object status indicating the first data object is a potential hot data object;
and
wherein the second computer is configured to:
receive the first request to obtain the first copy of a first data object;
determine that the second computer includes the first copy of the first data object;
determine that the first request is associated with a read-only use of the first data object;
determine that the second computer has the first copy of the first data object with a read-only status;
communicate, based at least in part on the first request associated with the read-only use of the first copy of the first data object and the first copy of the first data object having the read-only status, a notification that the first request did not cause an intervention associated with the first copy of the first data object;
and
demote a usage status of the first copy of the first data object from a read/write status to the read-only status in response to determining that the first request is associated with the read-only use of the first data object.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/154,204Filed 13 Jan 2023 · continuation
Priority: 16 Jun 2017
Published: US 2023/0153244 A118 May 2023
Granted: 6 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G06F 12/0828
Using directory methods: with concurrent directory accessing, i.e. handling multiple concurrent coherency transactions
G06F 12/0822
Using directory methods: copy directories
G06F 12/0833
Using a bus scheme, e.g. with bus monitoring or watching means: in combination with broadcast means
G06F 12/0842
Multiuser, multiprocessor or multiprocessing cache systems: for multiprocessing or multitasking

Family

Application15/625,097Parent of this continuation · filed 16 Jun 2017
Application16/745,411Parent of this continuation · filed 17 Jan 2020
US 10,585,800 B2Parent of this continuation · filed 10 Mar 2020
Application17/226,592Parent of this continuation · filed 9 Apr 2021
US 2023/0153244 A1Pre-grant publication · published 18 May 2023
US 11,586,542 B2Parent of this continuation
US 11,010,298 B2Parent of this continuation
US 2018/0365149 A1Published application
US 2020/0151097 A1Published application
US 2021/0232502 A1Published application
US 11,892,949 B2This patent

From the US filing history. Foreign family members aren’t listed.