gh-96143: Allow Linux perf profiler to see Python calls (GH-96123)

:warning:  :warning: Note for reviewers, hackers and fellow systems/low-level/compiler engineers :warning: :warning: 

If you have a lot of experience with this kind of shenanigans and want to improve the **first** version, **please make a PR against my branch** or **reach out by email** or **suggest code changes directly on GitHub**. 

If you have any **refinements or optimizations** please, wait until the first version is merged before starting hacking or proposing those so we can keep this PR productive.

1 files changed, 11 insertions, 0 deletions

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index bb646f1..8ce6d71 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1149,6 +1149,16 @@ init_interp_main(PyThreadState *tstate)
         if (_PyTraceMalloc_Init(config->tracemalloc) < 0) {
             return _PyStatus_ERR("can't initialize tracemalloc");
         }
+
+
+#ifdef PY_HAVE_PERF_TRAMPOLINE
+        if (config->perf_profiling) {
+            if (_PyPerfTrampoline_SetCallbacks(&_Py_perfmap_callbacks) < 0 ||
+                    _PyPerfTrampoline_Init(config->perf_profiling) < 0) {
+                return _PyStatus_ERR("can't initialize the perf trampoline");
+            }
+        }
+#endif
     }
 
     status = init_sys_streams(tstate);
@@ -1723,6 +1733,7 @@ finalize_interp_clear(PyThreadState *tstate)
         _PyArg_Fini();
         _Py_ClearFileSystemEncoding();
         _Py_Deepfreeze_Fini();
+        _PyPerfTrampoline_Fini();
     }
 
     finalize_interp_types(tstate->interp);