Abstract: The described technology is generally directed towards cross-stream transactions in a streaming data storage system, which allows a writer application to commit multiple events to distinct data streams in a single transaction. The system creates a cross-stream transaction for a writer application, and the writer application adds events to the cross-stream transaction, indicating which destination data stream(s) each event's data is to be appended. The system adds the event to a subordinate transaction created for each specified data stream. Upon committing the cross-stream transaction, the system coordinates the committing of the subordinate transactions to their respective data streams.

Abstract: The invention relates to a method, a non-transitory computer program product, and an apparatus for managing data storage. The method performed by a flash controller includes: obtaining information indicating a subregion to be activated, where the subregion is associated with a logical block address (LBA) range; triggering a garbage collection (GC) process being performed in background to migrate user data of all the or a portion of the LBA range associated with the subregion to continuous physical addresses in a flash device; and updating content of a plurality of entries associated with the subregion according to migration results, where each entry includes information indicating which physical address that user data of a corresponding logical address is physically stored in the flash device.

Abstract: Low latency in a non-uniform cache access (“NUCA”) cache in a computing environment is provided. A first compressed cache line is interleaved with a second compressed cache line into a single cache line of the NUCA cache, where data of the first compressed cache line is stored in one or more even sectors in the single cache line and stored in zero or more odd sectors in the single cache line after the data fills the one or more even sectors, and data of the second compressed cache line is stored in the one or more odd sectors in the single cache line and stored in zero or more even sectors in the single cache line after the data fills the one or more odd sectors.

Abstract: A processing apparatus is provided that includes NVRAM and one or more processors configured to process a first set and a second set of instructions according to a hierarchical processing scope and process a scoped persistence barrier residing in the program after the first instruction set and before the second instruction set. The barrier includes an instruction to cause first data to persist in the NVRAM before second data persists in the NVRAM. The first data results from execution of each of the first set of instructions processed according to the one hierarchical processing scope. The second data results from execution of each of the second set of instructions processed according to the one hierarchical processing scope. The processing apparatus also includes a controller configured to cause the first data to persist in the NVRAM before the second data persists in the NVRAM based on the scoped persistence barrier.

Abstract: An application thread executes concurrently with a garbage collection (GC) thread traversing a call stack of the application thread. Frames of the call stack that have been processed by the GC thread assume a global state associated with the GC thread. The application thread may attempt to return to a target frame that has not yet assumed the global state. The application thread hits a frame barrier, preventing return to the target frame. The application thread determines a frame state of the target frame. The application thread selects appropriate operations for bringing the target frame to the global state based on the frame state. The selected operations are performed to bring the target frame to the global state. The application thread returns to the target frame.

Abstract: Commands in a command queue are received and scheduled. For each of the commands, scheduling includes determining an age of a command based on an entrance time of the command in the command queue. When the age of the command satisfies a first threshold, marking all other commands in the command queue as not issuable when the command is a deterministic command, and marking all other commands in the command queue as not issuable when the command is a non-deterministic command and the intermediate command queue is not empty. Scheduling the command further includes determining whether the command is a read command and marking the command as not issuable when the command is a non-deterministic read command and the intermediate command queue is empty.

Abstract: A Solid State Drive (SSD) is disclosed. The SSD may comprise flash storage for data, the flash storage organized into a plurality of blocks. A controller may manage reading data from and writing data to the flash storage. Metadata storage may store device-based log data for errors in the SSD. Identification firmware may identify a block responsive to the device-based log data. In some embodiments of the inventive concept, verification firmware may determine whether the suspect block is predicted to fail responsive to both precise block-based data and the device-based log data.

Abstract: A memory module comprises a volatile memory subsystem, a non-volatile memory subsystem, and a module controller coupled to the volatile memory subsystem and to the non-volatile memory subsystem. The module controller is configurable to control data transfers between the volatile memory subsystem and the non-volatile memory subsystem. The module controller includes a data selection circuit configurable to pre-search data transferred from the non-volatile memory with respect to one or more search criteria before providing the pre-select data relevant to the one or more search criteria to the volatile memory subsystem.

Abstract: A processing device in a memory sub-system initiates read operations on each of a plurality of segments in a first region of the memory device during a first time interval, wherein at least a subset of the plurality of segments in the first region of the memory device are storing host data. The processing device further receives, as a result of at least one read operation, at least one data signal from a corresponding one of the plurality of segments in the first region of the memory device, and performs a signal calibration operation using the at least one data signal to synchronize one or more relevant signals with a reference clock signal used by the processing device.

Abstract: A processor receives, from a requestor, a first request containing a virtual address. Based on the first request, the processor determines a real address corresponding to the virtual address, encrypts at least a portion of the real address to obtain a cryptographic secure real address, and returns the cryptographic secure real address to the requestor. Based on receiving a second request specifying a request address, the processor decrypts the request address to validate the request address as the cryptographic secure real address. Based on validating the request address as the cryptographic secure real address, the processor allows access to a resource of the data processing system identified by the real address.

Abstract: A system includes a memory, including a plurality of memory locations having different respective addresses, and a processor. The processor is configured to compute one of the addresses from (i) a first sequence of bits derived from a tag of a data item, and (ii) a second sequence of bits representing a class of the data item. The processor is further configured to write the data item to the memory location having the computed address and/or read the data item from the memory location having the computed address. Other embodiments are also described.

Abstract: Techniques are described for managing access of executing programs to non-local block data storage. In some situations, a block data storage service uses multiple server storage systems to reliably store copies of network-accessible block data storage volumes that may be used by programs executing on other physical computing systems, and snapshot copies of some volumes may also be stored (e.g., on remote archival storage systems). A group of multiple server block data storage systems that store block data volumes may in some situations be co-located at a data center, and programs that use volumes stored there may execute on other computing systems at that data center, while the archival storage systems may be located outside the data center. The snapshot copies of volumes may be used in various ways, including to allow users to obtain their own copies of other users' volumes (e.g., for a fee).

Abstract: To provide a memory protection circuit and a memory protection method suitable for quick data transfer between a plurality of virtual machines via a common memory, according to an embodiment, a memory protection circuit includes a first ID storing register that stores therein an ID of any of a plurality of virtual machines managed by a hypervisor, an access determination circuit that permits the virtual machine having the ID stored in the first ID storing register to access a memory, a second ID storing register that stores therein an ID of any of the virtual machines, and an ID update control circuit that permits the virtual machine having the ID stored in the second ID storing register to rewrite the ID stored in the first ID storing register.

Abstract: A computational device generates a point in time copy of one or more regions of a time locked data set, in response to receiving one or more I/O operations directed to the time locked data set. The one or more I/O operations are performed on the point in time copy of the one or more regions of the time locked data set, in response to generating the point in time copy of the one or more regions of the time locked data set.

Abstract: A method for performing access management of a memory device with aid of a Universal Asynchronous Receiver-Transmitter (UART) connection and associated apparatus are provided. The method may include: utilizing a UART of a memory controller within the memory device to receive a set of intermediate commands corresponding to a set of operating commands through the UART connection between the memory device and a host device, wherein before sending the set of intermediate commands to the controller through the UART connection, the host device converts the set of operating commands into the set of intermediate commands; converting the set of intermediate commands into the set of operating commands according to a command mapping table; and accessing a non-volatile (NV) memory within the memory device with the set of operating commands for the host device, and sending a response to the host device through the UART connection.

Abstract: A technique for maintaining synchronization between two arrays includes assigning one array to be a preferred array and the other array to be a non-preferred array. When write requests are received at the preferred array, the writes are applied locally first and then applied remotely. However, when write requests are received at the non-preferred array, such writes are applied remotely first and then applied locally. Thus, writes are applied first on the preferred array and then on the non-preferred array, regardless of whether the writes are initially received at the preferred array or the non-preferred array.

Abstract: An apparatus including a memory structure comprising non-volatile memory cells and a microcontroller. The microcontroller is configured to output Core Timing Control (CTC) signals that are used to control voltages applied in the memory structure. In one aspect, information from which the CTC signals may be generated is pre-computed and stored. This pre-computation may be performed in a power on phase of the memory system. When a request to perform a memory operation is received, the stored information may be accessed and used to generate the CTC signals to control the memory operation. Thus, considerable time and/or power is saved. Note that this time savings occurs each time the memory operation is performed. Also, power is saved due to not having to repeatedly perform the computation.

Abstract: A method, computer program product, and computing system for receiving a plurality of discrete write requests on a first computing device until the end of a consolidation window; combining the plurality of discrete write requests received into a consolidated write request; and transmitting the consolidated write request to a second computing device.

Abstract: Wavefront loading in a processor is managed and includes monitoring a selected wavefront of a set of wavefronts. Reuse of memory access requests for the selected wavefront is counted. A cache hit rate in one or more caches of the processor is determined based on the counted reuse. Based on the cache hit rate, subsequent memory requests of other wavefronts of the set of wavefronts are modified by including a type of reuse of cache lines in requests to the caches. In the caches, storage of data in the caches is based on the type of reuse indicated by the subsequent memory access requests. Reused cache lines are protected by preventing cache line contents from being replaced by another cache line for a duration of processing the set of wavefronts. Caches are bypassed when streaming access requests are made.

Abstract: Described herein are systems and methods for prime and probe attack mitigation. For example, some methods include, responsive to a cache miss caused by a process, checking whether a priority level of the process satisfies a first priority requirement of a first cache block of a cache with multiple ways including cache blocks associated with respective priority requirements; responsive to the priority level satisfying the first priority requirement, loading the first cache block; and, responsive to the priority level satisfying the first priority requirement, updating the first priority requirement to be equal to the priority level of the process.