Samsung Electronics Co., Ltd.

Qualcomm Incorporated

Prarthna Santhanakrishnan

Ravi Iyengar

Adrian Montero

Paul Kitchin

Huzefa Sanjeliwala

Conrado Blasco

Pradeep Kanapathipillai

An electronic device includes one or more processors for executing one or more virtual machines. In response to a request for initiating a synchronization event, a processor identifies a subset of speculative memory access requests in one or more memory access request queues. Automatically and in accordance with the identifying, the processor purges translations associated with the subset of speculative memory access requests. Subsequent to the purging, the processor initiates the synchronization event. In some implementations, memory access completion is forced in response to a context synchronization event that corresponds to a termination of a first application, a termination of a first virtual machine, or a system call for updating a system register. Alternatively, in some implementations, memory access completion is forced in an operating system level or an application level in response to a data synchronization event that is initiated on a hypervisor layer or a firmware layer.

Latency management in synchronization events

Out-of-order CPUs, devices and methods diminish the time penalty from stalling the pipe to rebuild a rename table, such as due to a misprediction. A microprocessor can include a pipe that has a decoder, a dispatcher, and at least one execution unit. A rename table stores rename data, and a check-point table ('CPT') stores rename data received from the dispatcher. A Re-Order Buffer ('ROB') stores ROB data, and has a dynamic mapping relationship with the CPT. If the rename table is flushed, such as due to a misprediction, the rename table is rebuilt at least in part by concurrent copying of rename data stored in the CPT, in coordination with walking the ROB.

Reorder-buffer-based dynamic checkpointing for rename table rebuilding

Out-of-order CPUs, devices and methods diminish the time penalty from stalling the pipe to rebuild a rename table, such as due to a misprediction. A microprocessor can include a pipe that has a decoder, a dispatcher, and at least one execution unit. A rename table stores rename data, and a check-point table ('CPT') stores rename data received from the dispatcher. A Re-Order Buffer ('ROB') stores ROB data, and has a static mapping relationship with the CPT. If the rename table is flushed, such as due to a misprediction, the rename table is rebuilt at least in part by concurrent copying of rename data stored in the CPT, in coordination with walking the ROB.

Reorder-buffer-based static checkpointing for rename table rebuilding

Growing community of inventors

Austin, TX, United States of America

Prarthna Santhanakrishnan