Hardware-Traced Recompilation for Adaptive Code Optimization

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Solution Overview

Problem

Existing profiling techniques in software compilation are inefficient due to high overhead, lack of context-sensitivity, and inability to adapt to changes in application behavior after deployment, leading to sub-optimal performance and missed optimization opportunities.

Innovation Solution

Utilize hardware tracing to gather low-overhead, context-sensitive profiles of executing applications, allowing recompilation and optimization in production environments, leveraging features like Branch Trace Store and Processor Trace to detect and respond to phase changes without falling back to interpretation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If software instrumentation is used to collect profiling information, then profiling data can be gathered, but the application execution speed is significantly slowed down

Engineering Contradiction:

Improveprofiling information accuracyVSAvoidapplication execution speed

Core Design Contradiction:

Measurement precisionVSSpeed

Solution Approach 1:

The patent introduces hardware performance counters as an intermediary mechanism that collects profiling information independently of the application code. These counters operate in parallel with the application execution, capturing metrics like branch outcomes and memory accesses without inserting instrumentation code into the application, thus eliminating the performance overhead while maintaining profiling accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical approach of software instrumentation (inserting code into the application) with a hardware-based tracing system. The hardware performance counters and trace buffers capture execution information at the hardware level, substituting the need for software-based profiling mechanisms that inherently slow down execution

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If static compilation is performed by developers, then code can be optimized, but the system cannot respond to changes in application behavior at the end-user site

Engineering Contradiction:

Improvecode optimization qualityVSAvoidresponse to behavior changes

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic compilation that can adapt to changing application behavior. The system continuously collects profiling information using hardware traces during runtime and dynamically recompiles code based on observed phase changes in application behavior, allowing the system to evolve and optimize itself after deployment rather than being static

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes a feedback loop where hardware performance counters continuously monitor application execution and provide profiling information back to the compilation system. This feedback mechanism enables the system to detect phase changes in application behavior and trigger recompilation with optimized code tailored to the current execution phase

Inventive Principle:

Principle #23Feedback

3Productivity

If profiling is performed only during warmup phase, then initial optimization can be achieved, but later phase changes in program execution cannot be detected

Engineering Contradiction:

Improveinitial optimization efficiencyVSAvoiddetection of phase changes

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent implements continuous profiling throughout the entire application lifecycle, not just during the warmup phase. Hardware performance counters continuously trace execution and update profiling information, enabling the system to maintain optimization efficiency while adapting to phase changes that occur during production execution

Inventive Principle:

Principle #20Continuity of useful action

4Device complexity

If profiling information is averaged across all paths, then collection is simplified, but context-sensitivity is lost and optimization opportunities are missed

Engineering Contradiction:

Improveprofiling mechanism simplicityVSAvoidoptimization quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent segments profiling information by execution context, maintaining separate profiles for different call sites and control flow paths. The hardware trace system captures contextual information such as caller identifiers and branch outcomes, allowing the compilation system to generate context-sensitive profiles that preserve optimization opportunities while managing complexity through structured organization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12423210B2Optimized recompilation using hardware tracing

Publication Date: 2025.09.23 ORACLE INT CORP

AI summary

A tracing controller may utilize a binary execution trace mechanism to trace execution of compiled application machine code. The tracing controller may initiate hardware tracing to gather control-flow hardware traces of a method executing on a processor configured to generate hardware tracing information. The controller may generate a profile based on the hardware tracing information and initiate re-compiling or re-optimizing of the method in response to determining that the new profile differs from the previous profile. The controller may repeatedly profile and re-optimize a method until profiles for the method stabilize. Profiling and hardware tracing of an application may be selectively enabled or disabled allowing the controller to respond to later phase changes in application execution by re-optimizing, thereby potentially improving overall application performance.