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This PR implements frame caching in the RemoteUnwinder class to significantly reduce memory reads when profiling remote processes with deep call stacks. When cache_frames=True, the unwinder stores the frame chain from each sample and reuses unchanged portions in subsequent samples. Since most profiling samples capture similar call stacks (especially the parent frames), this optimization avoids repeatedly reading the same frame data from the target process. The implementation adds a last_profiled_frame field to the thread state that tracks where the previous sample stopped. On the next sample, if the current frame chain reaches this marker, the cached frames from that point onward are reused instead of being re-read from remote memory. The sampling profiler now enables frame caching by default. |
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| .. | ||
| images | ||
| asyncio.md | ||
| changing_grammar.md | ||
| code_objects.md | ||
| compiler.md | ||
| exception_handling.md | ||
| frames.md | ||
| garbage_collector.md | ||
| generators.md | ||
| interpreter.md | ||
| jit.md | ||
| parser.md | ||
| qsbr.md | ||
| README.md | ||
| stack_protection.md | ||
| string_interning.md | ||
CPython Internals Documentation
The documentation in this folder is intended for CPython maintainers. It describes implementation details of CPython, which should not be assumed to be part of the Python language specification. These details can change between any two CPython versions and should not be assumed to hold for other implementations of the Python language.
The core dev team attempts to keep this documentation up to date. If it is not, please report that through the issue tracker.