perf: use reserve_exact

morrisonlevi · realFlowControl · web-flow · commit 79801a8ee2c8 · 2025-12-17T12:24:17.000-07:00
Co-authored-by: Florian Engelhardt &lt;florian.engelhardt@datadoghq.com&gt;
diff --git a/profiling/src/profiling/stack_walking.rs b/profiling/src/profiling/stack_walking.rs
@@ -73,7 +73,7 @@ pub fn extract_function_name(func: &zend_function) -> Option<Cow<'static, str>>
     let (has_module, has_class) = (!module_name.is_empty(), !class_name.is_empty());
     let module_len = has_module as usize * "|".len() + module_name.len();
     let class_name_len = has_class as usize * "::".len() + class_name.len();
-    buffer.reserve(module_len + class_name_len + method_name.len());
+    buffer.reserve_exact(module_len + class_name_len + method_name.len());
 
     if has_module {
         buffer.extend_from_slice(module_name);
