Patent application number | Description | Published |
20110145486 | MEMORY MANAGEMENT DEVICE AND METHOD - According to one embodiment, a device includes a determination unit, compression unit, selecting unit, write updating unit, writing unit. The determination unit determines whether to compress write data based on specific information. The specific information including at least one of the type, number of accesses, access frequency and importance level of the write data. The compression unit compresses the write data when determining to compress the write data. The selecting unit selects a write region for the write data in nonvolatile memory based on the specific information. The write updating unit updates the specific information. The writing unit writes compressed write data into the write region when determining to compress the write data. The writing unit writes uncompressed write data into the write region when not determining to compress the write data. | 06-16-2011 |
20120030405 | INFORMATION PROCESSING DEVICE AND INFORMATION PROCESSING METHOD - According to one embodiment, an information processing device includes an OS and a virtual machine switching section. The OS accesses a hardware resource including a nonvolatile semiconductor memory and a semiconductor memory used as a cache memory of the nonvolatile semiconductor memory. The virtual machine switching section switches a virtual machine in exection from a first virtual machine to a second virtual machine while a cache process is executed, when cache miss in a process executed by the first virtual machine is detected. | 02-02-2012 |
20120030413 | MEMORY MANAGEMENT DEVICE, INFORMATION PROCESSING DEVICE, AND MEMORY MANAGEMENT METHOD - According to one embodiment, a memory management device configured to manage a main memory including a nonvolatile semiconductor memory, the memory management device includes a sort module configured to sort, at a time of a data write operation in the nonvolatile semiconductor memory, data to write areas of the nonvolatile semiconductor memory, based on information of a frequency of write which is determined by a data attribute of the data, and a control module configured to write the sorted data in the nonvolatile semiconductor memory by an incremental-write type. | 02-02-2012 |
20120030428 | INFORMATION PROCESSING DEVICE, MEMORY MANAGEMENT DEVICE AND MEMORY MANAGEMENT METHOD - According to one embodiment, an information processing device includes a first determination section and a setting section. The first determination section determines inconsistency between first data and second data. The first data is stored in a nonvolatile semiconductor memory. The second data is corresponding to the first data and stored in a semiconductor memory. The setting section sets execution timing of write back based on access frequency information associated with the second data. | 02-02-2012 |
20130191609 | INFORMATION PROCESSING DEVICE INCLUDING HOST DEVICE AND SEMICONDUCTOR MEMORY DEVICE AND SEMICONDUCTOR MEMORY DEVICE - A device includes a host including a main memory, and semiconductor memory including a nonvolatile semiconductor memory, memory unit, and controller. The nonvolatile semiconductor memory stores first address information. The memory unit stores second address information as part of the first address information. The controller accesses the nonvolatile semiconductor memory based on the second address information. Third address information is stored in the main memory, and is part or all of the first address information. The controller uses the third address information when accessing the nonvolatile semiconductor memory if address information to be referred is not stored in the second address information. | 07-25-2013 |
20130198437 | MEMORY MANAGEMENT DEVICE AND MEMORY MANAGEMENT METHOD - In an embodiment, a device includes a first unit, a second unit, and a third unit. The first unit generates a write address representing a write position to sequentially store sequential data from a processor to a nonvolatile main memory. The second unit generates order information representing a degree of newness of write. The third unit writes sequentially writes the sequential data at the write address with the order information. | 08-01-2013 |
20130198445 | SEMICONDUCTOR MEMORY DEVICE AND INFORMATION PROCESSING DEVICE - According to one embodiment, a semiconductor memory device includes a memory and a controller. The memory stores data pieces and search information including entries, where each entry is associated with a search key for specifying one data piece and a real address at which the data piece is stored. Upon reception of a first command, the controller, when the first command specifies a search key, outputs one data piece corresponding to one entry which includes the search key, and when the first command specifies one real address, outputs one data piece corresponding to one entry including the real address. | 08-01-2013 |
20150039808 | MEMORY SYSTEM - According to one embodiment, a memory system includes nonvolatile memories each storing data and an address table for acquiring an address of the data, and a control unit which is configured to be capable of accessing the nonvolatile memories in parallel, and issues table read requests for reading the address tables and data read requests for reading the data to the nonvolatile memories in response to read commands from a host. When a table read request and a data read request are issued to a same nonvolatile memory, the control unit processes the data read request in priority to the table read request. | 02-05-2015 |
20150058541 | MEMORY MANAGEMENT DEVICE AND METHOD - According to one embodiment, a device includes a determination unit, compression unit, selecting unit, write updating unit, writing unit. The determination unit determines whether to compress write data based on specific information. The specific information including at least one of the type, number of accesses, access frequency and importance level of the write data. The compression unit compresses the write data when determining to compress the write data. The selecting unit selects a write region for the write data in nonvolatile memory based on the specific information. The write updating unit updates the specific information. The writing unit writes compressed write data into the write region when determining to compress the write data. The writing unit writes uncompressed write data into the write region when not determining to compress the write data. | 02-26-2015 |