CPU Core State Migration to Spare Core
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Solution Overview
Problem
Modern processors face downtime and processing delays when a core enters an inoperable state, requiring resets, power cycles, or physical replacements, which can be time-consuming and disruptive.
Innovation Solution
The method involves detecting when a core stops committing instructions, disabling it from further processing, and transferring its data to a spare core, allowing the spare core to resume processing the instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a core enters an inoperable state and requires reset or power cycle to recover, then the core can resume processing, but system downtime and processing delays increase
Solution Approach 1:
The patent pre-positions a spare core in standby mode before the primary core fails. When the primary core enters an inoperable state, the spare core is already prepared to immediately take over processing tasks, eliminating the downtime associated with reset or power cycle operations. This preliminary preparation of backup resources directly resolves the contradiction between ensuring core recovery capability and minimizing system downtime.
2Reliability
If a core is reset to exit stalled state, then the core can continue execution, but other processor cores waiting on output experience delays
Solution Approach 1:
The patent creates a copy of the processor state from the inoperable core and transfers it to a spare core. This copying mechanism allows the spare core to assume the exact execution context of the failed core, enabling other cores that were waiting on output to continue receiving data without delays. The state copy ensures execution continuity while maintaining processor throughput, resolving the contradiction between core reliability and system productivity.
3Reliability
If physical damage occurs to a core, then the core must be replaced, but system downtime extends until replacement is complete
Solution Approach 1:
The patent maintains a spare core in standby mode as a pre-prepared replacement resource. When physical damage occurs to the primary core, the system can immediately switch to the spare core without waiting for replacement or repair operations. This preliminary preparation of backup hardware eliminates system unavailability time while ensuring continuous operational status, directly resolving the contradiction between maintaining system reliability and minimizing downtime during hardware replacement.
Data Source
AI summary
An apparatus is disclosed in which the apparatus may include a plurality of cores, including a first core, a second core and a third core, and circuitry coupled to the first core. The first core may be configured to process a plurality of instructions. The circuitry may be may be configured to detect that the first core stopped committing a subset of the plurality of instructions, and to send an indication to the second core that the first core stopped committing the subset. The second core may be configured to disable the first core from further processing instructions of the subset responsive to receiving the indication, and to copy data from the first core to a third core responsive to disabling the first core. The third core may be configured to resume processing the subset dependent upon the data.