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[3.15] gh-141004: Document unstable perf map functions in `ceval.h` (GH-143492) by miss-islington · Pull Request #150849 · python/cpython · GitHub

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[3.15] gh-141004: Document unstable perf map functions in ceval.h (GH-143492) #150849

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ZeroIntensity merged 1 commit into from
Jun 3, 2026
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[3.15] gh-141004: Document unstable perf map functions in ceval.h (GH-143492) #150849

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40 changes: 40 additions & 0 deletions Doc/c-api/perfmaps.rst
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Expand Up @@ -49,3 +49,43 @@ Note that holding an :term:`attached thread state` is not required for these API
This is called by the runtime itself during interpreter shut-down. In
general, there shouldn't be a reason to explicitly call this, except to
handle specific scenarios such as forking.

.. c:function:: int PyUnstable_CopyPerfMapFile(const char *parent_filename)

Open the ``/tmp/perf-$pid.map`` file and append the content of *parent_filename*
to it.

This function is available on all platforms but only generates output on platforms
that support perf maps (currently only Linux). On other platforms, it does nothing.

.. versionadded:: 3.13

.. c:function:: int PyUnstable_PerfTrampoline_CompileCode(PyCodeObject *code)

Compile the given code object using the current perf trampoline.

The "current" trampoline is the one set by the runtime or the most recent
:c:func:`PyUnstable_PerfTrampoline_SetPersistAfterFork` call.

If no trampoline is set, falls back to normal compilation (no perf map entry).

:param code: The code object to compile.
:return: 0 on success, -1 on failure.

.. versionadded:: 3.13

.. c:function:: int PyUnstable_PerfTrampoline_SetPersistAfterFork(int enable)

Set whether the perf trampoline should persist after a fork.

* If ``enable`` is true (non-zero): perf map file remains open/valid post-fork.
Child process inherits all existing perf map entries.
* If ``enable`` is false (zero): perf map closes post-fork.
Child process gets empty perf map.

Default: false (clears on fork).

:param enable: 1 to enable, 0 to disable.
:return: 0 on success, -1 on failure.

.. versionadded:: 3.13
4 changes: 0 additions & 4 deletions Tools/check-c-api-docs/ignored_c_api.txt
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Expand Up @@ -43,10 +43,6 @@ PyDescr_TYPE
PyWrapperFlag_KEYWORDS
# cpython/fileobject.h
Py_UniversalNewlineFgets
# cpython/ceval.h
PyUnstable_CopyPerfMapFile
PyUnstable_PerfTrampoline_CompileCode
PyUnstable_PerfTrampoline_SetPersistAfterFork
# cpython/pyframe.h
PyUnstable_EXECUTABLE_KINDS
PyUnstable_EXECUTABLE_KIND_BUILTIN_FUNCTION
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