[K/N] Enable extra option for mimalloc ^KT-53182

Merge-request: KT-MR-6952
Merged-by: Alexander Shabalin <Alexander.Shabalin@jetbrains.com>

kotlin-native/runtime/src/main/cpp/CompilerConstants.cpp

@@ -27,6 +27,7 @@ RUNTIME_WEAK int32_t Kotlin_printToAndroidLogcat = 1;
 #endif
 // Keep it 0 even when the compiler defaults to 1: if the overriding mechanism breaks, keeping it disabled is safer.
 RUNTIME_WEAK int32_t Kotlin_appStateTracking = 0;
+RUNTIME_WEAK int32_t Kotlin_mimallocUseDefaultOptions = 1;
 
 ALWAYS_INLINE compiler::DestroyRuntimeMode compiler::destroyRuntimeMode() noexcept {
     return static_cast<compiler::DestroyRuntimeMode>(Kotlin_destroyRuntimeMode);
@@ -58,3 +59,7 @@ ALWAYS_INLINE int compiler::getSourceInfo(void* addr, SourceInfo *result, int re
         return Kotlin_getSourceInfo_Function(addr, result, result_size);
     }
 }
+
+ALWAYS_INLINE bool compiler::mimallocUseDefaultOptions() noexcept {
+    return Kotlin_mimallocUseDefaultOptions != 0;
+}

kotlin-native/runtime/src/main/cpp/CompilerConstants.hpp

@@ -108,6 +108,7 @@ DestroyRuntimeMode destroyRuntimeMode() noexcept;
 bool suspendFunctionsFromAnyThreadFromObjCEnabled() noexcept;
 AppStateTracking appStateTracking() noexcept;
 int getSourceInfo(void* addr, SourceInfo *result, int result_size) noexcept;
+bool mimallocUseDefaultOptions() noexcept;
 
 #ifdef KONAN_ANDROID
 bool printToAndroidLogcat() noexcept;

kotlin-native/runtime/src/opt_alloc/cpp/ObjectAlloc.cpp

@@ -5,12 +5,24 @@
 
 #include "ObjectAlloc.hpp"
 
+#include <mutex>
+
 #include "../../mimalloc/c/include/mimalloc.h"
 #include "Alignment.hpp"
+#include "CompilerConstants.hpp"
 
 using namespace kotlin;
 
+namespace {
+
+std::once_flag initOptions;
+
+}
+
 void kotlin::initObjectPool() noexcept {
+    if (!compiler::mimallocUseDefaultOptions()) {
+        std::call_once(initOptions, [] { mi_option_enable(mi_option_reset_decommits); });
+    }
     mi_thread_init();
 }