Kabushiki Kaisha Toshiba

Toshiba Memory Corporation

Yusuke Shirota

Tatsunori Kanai

Satoshi Shirai

Masaya Tarui

Tetsuro Kimura

Junichi Segawa

Hiroyoshi Haruki

Koichi Fujisaki

Akihiro Shibata

Haruhiko Toyama

Shiyo Yoshimura

Seiji Maeda

Hidenori Matsuzaki

Kazuya Kitsunai

Mayuko Koezuka

Toshiki Kizu

Akira Takeda

A model generation apparatus according to an embodiment includes a processor circuit. The processor circuit is configured to: divide time-series data of operation information in a time direction to generate a plurality of segments; allocate any one memory control method of a plurality of memory control methods to each of the plurality of segments; estimate, for each of the plurality of segments, execution performance of memory access that is obtainable in a case where an information processing apparatus executes processing of a corresponding segment by an allocated memory control method; select a plurality of training segments from among the plurality of segments; and generate a decision model based on the selected plurality of training segments.

Decision model generation for allocating memory control methods

An information processing apparatus according to an embodiment includes a first memory, a non-volatile memory, and one or more processors. The processor is configured to execute information processing on data stored in those memories. The processor allocates, to each of pages included in a file stored in the non-volatile memory by executing an operating system, a memory access method that indicates either copy access processing or direct access processing to be executed. The copy access processing performs writing and readout of data copied from the non-volatile memory into the first memory. The direct access processing directly performs writing and readout of data stored in the non-volatile memory. The processor accesses those memories by the memory access method allocated to each of the pages included in the file when the operating system receives a request from an application program for writing or readout on the file.

Information processing apparatus, memory control method, and computer program product

According to an embodiment, an electronic circuit board includes a nonvolatile memory, a reading circuit to read data stored in the nonvolatile memory, a switch, and a communication circuit. When power is supplied from a first power source, the switch performs switching to a first state in which the nonvolatile memory and a host device configured to read and write data from and in the nonvolatile memory are connected. When power is supplied from a second power source, the switch performs switching to a second state in which the host device and the nonvolatile memory are not connected and the reading circuit and the nonvolatile memory are connected. The communication circuit transmits, to an external device, the data read by the reading circuit from the nonvolatile memory when power is being supplied from the second power source.

Electronic circuit board

According to an embodiment, a management apparatus manages access to a plurality of types of storage units by a processing circuit. Each of the plurality of types of storage units includes a plurality of first regions, and each of the plurality of first regions includes a plurality of second regions. The management apparatus includes a circuitry configured to function as a management unit. The management unit manages a management table in which identification information of one or more of the plurality of first regions and access management information defining access information indicating whether or not each second region included in the one or more of the plurality of first regions is accessed by the processing circuit are associated with each other.

Management apparatus, information processing apparatus, management method, and computer program product

An information processing device according to an embodiment includes a processing circuit. The processing circuit is configured to: obtains operation information; estimates, based on the obtained operation information, the execution performance of memory accesses with respect to a first memory and a nonvolatile memory unit in the case in which a managing device performs operations according to each of a plurality of memory control methods; selects, based on the execution performance estimated for each memory control method, any one memory control method from among a plurality of memory control methods; and performs a setting operation with respect to an access managing unit in such a way that the managing device accesses the first memory and the nonvolatile memory unit according to the selected memory control method.

Information processing device, information processing method, estimation device, estimation method, and computer program product

According to an embodiment, a management device includes a counter storage unit, a first management information storage unit, and an update unit. The first management information storage unit stores a first management table capable of storing first management information about each of a predetermined number of first areas. The first management information indicates whether each second area included in a corresponding first area has data written therein. In response to writing of first data into the nonvolatile memory, when a state of a target second area indicated in the first management information about a target first area is an unwritten state, the update unit changes the state of the target second area to a written state; while when the state of the target second area indicated in the first management information is the written state, the update unit updates the counter value for the target first area.

Management device, information processing device, and management method

A management device is configured to control reading and writing of data as performed by a processing circuit with respect to a nonvolatile memory. The management device includes circuitry configured to: in response to a request from the processing circuit, perform writing or reading with respect to the nonvolatile memory; in response to writing with respect to the nonvolatile memory, update a table indicating a rewriting count for each area in the nonvolatile memory; detect writing having a high degree of locality representing rewriting operation performed to an extent equal to or greater than a reference value, with respect to the same area in the nonvolatile memory by refer to the table; and identify an area under attack in which the writing having the high degree of locality is performed.

Management device and information processing device

According to one embodiment, a memory controller includes a nonvolatile cache memory and a controller. The nonvolatile cache memory is configured to store a piece of data stored in a nonvolatile main memory connected to the memory controller. The controller is configured to control writing of data to the nonvolatile cache memory. The memory controller is connected to a processor via an interconnect that ensures a protocol indicating a procedure for preventing data inconsistency in a plurality of cache memories. The controller causes, after detecting that the processor has updated data corresponding to any area of the nonvolatile main memory using the protocol, the updated data to be transmitted to the memory controller and writes the updated data to the nonvolatile cache memory.

Memory controller, information processing apparatus, and processor

According to an embodiment, a management device includes: a setting memory configured to store an access method indicating which of a first access process of performing writing or reading with respect to data transferred from a non-volatile memory to a first memory, or a second access process of directly performing writing or reading with respect to data stored in the non-volatile memory, is to be executed for each of the plurality of pages; and circuitry configured to select any page set to the second access process among the plurality of pages, as an exchange target page, when a write amount with respect to the non-volatile memory is larger than a set value, and change an access method of the exchange target page from the second access process to the first access process.

According to one embodiment, a memory device is connected to one or more information processing devices. The memory device includes a shared memory and a memory controller. The memory controller is configured to analyze an access to the shared memory by the one or more information processing devices and decide on an access method for accessing the shared memory by the one or more information processing devices. The memory controller is configured to give an instruction indicating the decided access method to the one or more information processing devices.

Memory device and information processing system

According to an embodiment, an information processing apparatus includes a processing device, a first memory, and a second memory. The processing device executes first processing on first data. The second memory stores the first data and has a data access latency higher than that of the first memory. The first data includes first and second pages, the first page being read/written times not less than a threshold in a certain period shorter than a period for executing the first processing, the second page being read/written times less than the threshold in the certain period. The processing device includes a controller configured to execute first access to move the first page to the first memory and then read/write data from/to the moved first page, and execute second access to directly read/write data from/to the second page of the second memory.

Information processing apparatus, storage device, and computer program product

According to an embodiment, an information processing apparatus includes a processing device, a first memory, a second memory, and a controller. The processing device is configured to process first data. The first memory is configured to store at least part of the first data and has an active region supplied with power necessary for holding data. The second memory is configured to store part of the first data. The controller is configured to change number of active regions such that processing information is not more than a threshold. The processing information indicates an amount of processing for moving at least part of second data stored in the first memory to the second memory and for moving at least part of third data stored in the second memory to the first memory, in a certain period for processing the first data having a size larger than active regions.

Information processing apparatus and computer program product for changing swap spaces based on a performance threshold

According to an embodiment, in an information processing device, when there is no change in a first image received from an image sensor, reception of the next first image is awaited. When there is a change in the first image, a second image having a higher resolution than the first image is received from the image sensor and processing for the second image is performed.

Information processing device and image input device

According to an embodiment, a control device includes a calculator and a setting unit. The calculator is configured to calculate a system processing time indicating a time required for processing executed after a system, the system including a plurality of elements, power to each element being individually controlled, resumes from a sleep state in which the number of elements supplied with power is limited to a predetermined number and an operation of the system is stopped. The setting unit is configured to set a mode indicating an operation state of the system according to the system processing time calculated by the calculator when a resume factor indicating a factor for resuming the system from the sleep state occurs.

Control device, system, and computer program product

According to an embodiment, upon receiving a use request including an identifier of a program and authentication information, a use request processing unit makes a determination on validity of the use request based on an ID management information and access authority management information, generates an access key when the use request is valid, registers the access key in access key management information in correlation with a usable address range, and returns the access key to a transmission source of the use request. Upon receiving a read/write request including an address where reading-out or writing of data is performed and an access key, a read/write request processing unit makes a determination on validity of the read/write request based on the access key management information, and executes reading-out or writing of data with respect to a shared memory in response to the read/write request when the read/write request is valid.

Growing community of inventors

Yokohama, Japan

Yusuke Shirota