Michael Coleman Blake

US Patent:

20130339608, Dec 19, 2013

Filed:

Jun 13, 2012

Appl. No.:

13/495373

Inventors:

Timothy C. Bronson - Round Rock TX, US
Garrett M. Drapala - Poughkeepsie NY, US
Michael A. Blake - Wappingers Falls NY, US
Craig R. Walters - Highland NY, US
Pak-Kin Mak - Poughkeepsie NY, US

Assignee:

INTERNATIONAL BUSINESS MACHINES CORPORATION - Armonk NY

International Classification:

G06F 12/08

US Classification:

711122, 711119, 711E12017

Abstract:

Embodiments relate to accessing a cache line on a multi-level cache system having a system memory. Based on a request for exclusive ownership of a specific cache line at the local node, requests are concurrently sent to the system memory and remote nodes of the plurality of nodes for the specific cache line by the local node. The specific cache line is found in a specific remote node. The specific remote node is one of the remote nodes. The specific cache line is removed from the specific remote node for exclusive ownership by another node. Based on the specified node having the specified cache line in ghost state, any subsequent fetch request is initiated for the specific cache line from the specific node encounters the ghost state. When the ghost state is encountered, the subsequent fetch request is directed only to nodes of the plurality of nodes.

US Patent:

20200327058, Oct 15, 2020

Filed:

Apr 10, 2019

Appl. No.:

16/380307

Inventors:

- Armonk NY, US
Tim Bronson - Round Rock TX, US
Deanna P. D. Berger - Hyde Park NY, US
Chad G. Wilson - Poughkeepsie NY, US
Kenneth Douglas Klapproth - Travis TX, US
Arthur O'Neill - Poughkeepsie NY, US
Michael A. Blake - Wappingers Falls NY, US
Guy G. Tracy - Austin TX, US

International Classification:

G06F 12/0815

Abstract:

Processing simultaneous data requests regardless of active request in the same addressable index of a cache. In response to the cache miss in the given congruence, if the number of other compartments in the given congruence class that have an active operation is less than a predetermined threshold, setting a Do Not Cast Out (DNCO) pending indication for each of the compartments that have an active operation in order to block access to each of the other compartments that have active operations and, if the number of other compartments in the given congruence class that have an active operation is not less than a predetermined threshold, blocking another cache miss from occurring in the compartments of the given congruence class by setting a congruence class block pending indication for the given congruence class in order to block access to each of the other compartments of the given congruence class.

US Patent:

20200264797, Aug 20, 2020

Filed:

Feb 20, 2019

Appl. No.:

16/280641

Inventors:

- Armonk NY, US
Tim Bronson - Round Rock TX, US
Hieu T. Huynh - Austin TX, US
Michael Andrew Blake - Wappingers Falls NY, US

International Classification:

G06F 3/06

Abstract:

Methods, systems and computer program products for evacuating memory from a drawer in a live multi-node system are provided. Aspects include placing a first drawer into an evacuation mode. The evacuation mode includes a cessation of non-evacuation operations and provides for a transfer of data stored by memory of the first drawer to a destination drawer using dynamic memory reallocation (DMR). Aspects also include transmitting a store request by the first drawer to the destination drawer. The store request represents a request to transfer the data stored by the memory of the first drawer to the destination drawer for storage by the destination drawer. Aspects also include transmitting the data stored by the memory of the first drawer to the destination drawer. The data is transmitted by the first drawer using a local pool of fetch/store controllers.

US Patent:

20200264977, Aug 20, 2020

Filed:

Feb 14, 2019

Appl. No.:

16/275436

Inventors:

- Armonk NY, US
Tim Bronson - Round Rock TX, US
Michael Andrew Blake - Wappingers Falls NY, US
Vesselina Papazova - Highland NY, US
Arthur O'Neill - Poughkeepsie NY, US
Kenneth Klapproth - Travis TX, US

International Classification:

G06F 12/0806
G06F 12/0817

Abstract:

Provided are systems, methods, and media for simultaneous, non-atomic request processing of snooped operations of a broadcast scope within a SMP system. An example method includes detecting, by a first controller, based on a set of coherency resolution conditions, whether there are coherency resolution problems between two snooped operations. The method includes in response to detecting, by the first controller, that coherency resolution problems will not result, transmitting, from the first controller to a second controller, an indication signal indicating that coherency resolution problems will not result from the operation. The set of coherency resolution conditions includes: (a) detecting that a second operation of the two snooped operations operation is of a predetermined type, (b) detecting at time of snooping of the second operation that a directory state does not allow for exclusive data, and (c) detecting that the first controller has started committing to an update.