Abstract: According to one general aspect, an apparatus may include a cache pre-fetcher, and a pre-fetch scheduler. The cache pre-fetcher may be configured to predict, based at least in part upon a virtual address, data to be retrieved from a memory system. The pre-fetch scheduler may be configured to convert the virtual address of the data to a physical address of the data, and request the data from one of a plurality of levels of the memory system. The memory system may include a plurality of levels, each level of the memory system configured to store data.

Abstract: Dynamically predicting a Read-After-Write (RAW) hazard by employing a variable confidence score attributed to a RAW Resynchronization Predictor (RRP) for sampling the RRP at timing periods dynamically adjusted based on the confidence score to optimize prediction of the RAW hazard.

Abstract: A computing system includes: an instruction dispatch module configured to receive an address stream; a prefetch module, coupled to the instruction dispatch module, configured to: train to concurrently detect a single-stride pattern or a multi-stride pattern from the address stream, speculatively fetch a program data based on the single-stride pattern or the multi-stride pattern, and continue to train for the single-stride pattern with a larger value for a stride count or for the multi-stride pattern.

Abstract: According to one general aspect, a method may include receiving, by a pre-fetch unit, a demand to access data stored at a memory address. The method may include determining if a first portion of the memory address matches a prior defined region of memory. The method may further include determining if a second portion of the memory address matches a previously detected pre-fetched address portion. The method may also include, if the first portion of the memory address matches the prior defined region of memory, and the second portion of the memory address matches the previously detected pre-fetched address portion, confirming that a pre-fetch pattern is associated with the memory address.

Abstract: According to one general aspect, an apparatus may include a cache pre-fetcher, and a pre-fetch scheduler. The cache pre-fetcher may be configured to predict, based at least in part upon a virtual address, data to be retrieved from a memory system. The pre-fetch scheduler may be configured to convert the virtual address of the data to a physical address of the data, and request the data from one of a plurality of levels of the memory system. The memory system may include a plurality of levels, each level of the memory system configured to store data.

Abstract: Dynamically predicting a Read-After-Write (RAW) hazard by employing a variable confidence score attributed to a RAW Resynchronization Predictor (RRP) for sampling the RRP at timing periods dynamically adjusted based on the confidence score to optimize prediction of the RAW hazard.

Abstract: Methods and apparatus for utilizing a downhole deployment valve (DDV) to isolate a pressure in a portion of a bore are disclosed. Any combination of fail safe features may be used with or incorporated into the DDV such as redundant valve members, an upward opening flapper valve or a metering flapper below a sealing valve. In one aspect, a barrier or diverter located in the bore above a valve member of the DDV permits passage through the bore when the valve member is open and actuates when the valve member is closed. Once actuated, the barrier or diverter either stops or diverts any dropped objects prior to the dropped object reaching and potentially damaging the valve member. In another aspect, the tool string tripped in above the DDV includes an acceleration actuated brake that anchors the tool string to a surrounding tubular if the tool string is dropped.

Abstract: Prefetching across a page boundary in a data processing system. The system determines whether a prefetch will cross a page boundary of memory, and if so, it determines whether a translation source has an entry corresponding to the virtual address of the prefetch. If the translation source has an entry corresponding the virtual address, a physical address of the virtual address is used to prefetch the information.

Abstract: Generating a hashed value of the program counter in a data processing system. The hashed value can be used for prefetching in the data processing system. In some examples, the hashed value is used to identify whether a load instruction associated with the hashed value has an address that is part of a strided stream in an address stream. In some examples, the hashed value is a subset of bits of the bits of the program counter. In other examples, the hashed value may be derived in other ways from the program counter.

Abstract: A memory management unit (MMU) has a cache for storing address translation entries (ATEs) corresponding to virtual addresses. If an ATE is present for a requested virtual address, then it is translated to the physical address and sent to main memory. If the MMU cache misses, the virtual address is hashed to obtain the physical address for a group of ATEs. After hashing, a decision is made whether to prefetch the group of ATEs or not. If so, the group is loaded into the data cache. Another determination is made; in this case whether to continue or not. If the request is not valid, the process is terminated. If the request is still valid, then a tablewalk is performed on the group to find the matching entry, which is loaded into the MMU cache. The virtual address is translated to obtain the physical address which is sent to main memory.

Abstract: Methods and apparatus for utilizing a downhole deployment valve (DDV) to isolate a pressure in a portion of a bore are disclosed. Any combination of fail safe features may be used with or incorporated into the DDV such as redundant valve members, an upward opening flapper valve or a metering flapper below a sealing valve. In one aspect, a barrier or diverter located in the bore above a valve member of the DDV permits passage through the bore when the valve member is open and actuates when the valve member is closed. Once actuated, the barrier or diverter either stops or diverts any dropped objects prior to the dropped object reaching and potentially damaging the valve member. In another aspect, the tool string tripped in above the DDV includes an acceleration actuated brake that anchors the tool string to a surrounding tubular if the tool string is dropped.