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2900 results about "Address space" patented technology

In computing, an address space defines a range of discrete addresses, each of which may correspond to a network host, peripheral device, disk sector, a memory cell or other logical or physical entity.

Providing global translations with address space numbers

A processor provides a register for storing an address space number (ASN). Operating system software may assign different ASNs to different processes. The processor may include a TLB to cache translations, and the TLB may record the ASN from the ASN register in a TLB entry being loaded. Thus, translations may be associated with processes through the ASNs. Generally, a TLB hit will be detected in an entry if the virtual address to be translated matches the virtual address tag and the ASN matches the ASN stored in the register. Additionally, the processor may use an indication from the translation table entries to indicate whether or not a translation is global. If a translation is global, then the ASN comparison is not included in detecting a hit in the TLB. Thus, translations which are used by more than one process may not occupy multiple TLB entries. Instead, a hit may be detected on the TLB entry storing the global translation even though the recorded ASN may not match the current ASN. In one embodiment, if ASNs are disabled, the TLB may be flushed on context switches. However, the indication from the translation table entries used to indicate that the translation is global may be used (when ASNs are disabled) by the TLB to selectively invalidate non-global translations on a context switch while not invalidating global translations.
Owner:GLOBALFOUNDRIES US INC

Garbage collector for a virtual heap

A method and system for performing generational garbage collection on a virtual heap in a virtual machine is provided. The garbage collection method is suited for use with small consumer and appliance devices that have a small amount of memory and may be using flash devices as persistent storage. The garbage collection method may provide good performance where only a portion of the virtual heap may be cached in the physical heap. The virtual heap may use a single address space for both objects in the store and the in-memory heap. In one embodiment, a single garbage collector is run on the virtual heap address space. The garbage collection method may remove non-referenced objects from the virtual heap. The garbage collection method may also include a compaction phase to reduce or eliminate fragmentation, and to improve locality of objects within the virtual heap. In one embodiment, the garbage collector for the virtual heap may be implemented as a generational garbage collector using working sets in the virtual heap, where each generation is confined to a working set of the heap. The generational garbage collector may allow the flushing of changes after each garbage collection cycle for each working set region. Heap regions with different flushing policies may be used. An object nursery region without flushing where objects are initially created may be used. When a garbage collection cycle is run, objects truly referenced in the object nursery may be copied back into heap regions to be flushed, while short-lived objects no longer referenced may be deleted without flushing.
Owner:ORACLE INT CORP +1

Garbage collection using nursery regions for new objects in a virtual heap

A method and system for garbage collecting a virtual heap using nursery regions for newly created objects to reduce flushing of objects from an in-memory heap to a store heap is provided. The garbage collection method is suited for use with small consumer and appliance devices that have a small amount of memory and may be using flash devices as persistent storage. The garbage collection method may provide good performance where only a portion of the virtual heap may be cached in the physical heap. The virtual heap may use a single address space for both objects in the store and the in-memory heap. In one embodiment, a single garbage collector is run on the virtual heap address space. The garbage collection method may remove non-referenced objects from the virtual heap. The garbage collection method may also include a compaction phase to reduce or eliminate fragmentation, and to improve locality of objects within the virtual heap. In one embodiment, the garbage collector for the virtual heap may be implemented as a generational garbage collector using working sets in the virtual heap, where each generation is confined to a working set of the heap. The generational garbage collector may allow the flushing of changes after each garbage collection cycle for each working set region. Heap regions with different flushing policies may be used. An object nursery region without flushing where objects are initially created may be used. When a garbage collection cycle is run, objects truly referenced in the object nursery may be copied back into heap regions to be flushed, while short-lived objects no longer referenced may be deleted without flushing.
Owner:ORACLE INT CORP
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