refactor(profiling): split stack sampler helpers - #18975
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Extract the task/greenlet/normal-stack rendering block out of ThreadInfo::sample into a render_unwound_stacks() free function so the rendering path can be reused by additional callers. Pure refactor: same render order, renderer, and container clears; no behavior change. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Extract the task/greenlet/normal-stack rendering block out of ThreadInfo::sample into a private ThreadInfo::render_unwound_stacks() method so the rendering path can be reused by additional callers, consistent with the existing unwind_tasks/unwind_greenlets helpers. Pure refactor: same render order, renderer, and container clears; no behavior change. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
…//github.com/DataDog/dd-trace-py into taegyunkim/prof-14213-stack-sampler-refactor # Conflicts: # ddtrace/internal/datadog/profiling/stack/src/echion/threads.cc
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## Description Pure refactor of existing stack sampler internals, with no intended behavior or internal contract changes, in preparation for timer_create based cpu time profiling in #18724 Specifically: - Extracts the existing task/greenlet/thread-stack rendering branch in `ThreadInfo::sample()` into a local `render_unwound_stacks()` helper. - Extracts duplicate one-time thread registration failure logging in `Sampler::register_thread()` into a local helper. This does not introduce CPU timer profiling, new configuration, new native bindings, or changes to thread registration semantics. ## Testing - `scripts/lint cformat` Attempted a targeted profiling test run from the worktree, but the test runner failed during riot venv setup before executing tests due the worktree using `/home/bits/project/.riot`, which was not writable/available in that context. ## Risks Low. This is intended to be behavior-preserving refactoring only. ## Additional Notes No changelog needed, internal refactor only. Co-authored-by: taegyun.kim <taegyun.kim@datadoghq.com>
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Description
Pure refactor of existing stack sampler internals, with no intended behavior or internal contract changes, in preparation for timer_create based cpu time profiling in #18724
Specifically:
ThreadInfo::sample()into a localrender_unwound_stacks()helper.Sampler::register_thread()into a local helper.This does not introduce CPU timer profiling, new configuration, new native bindings, or changes to thread registration semantics.
Testing
scripts/lint cformatAttempted a targeted profiling test run from the worktree, but the test runner failed during riot venv setup before executing tests due the worktree using
/home/bits/project/.riot, which was not writable/available in that context.Risks
Low. This is intended to be behavior-preserving refactoring only.
Additional Notes
No changelog needed, internal refactor only.
PROF-14213