From cf0bdce7d4c92aac953bcefa1bf9ec4d84b3a067 Mon Sep 17 00:00:00 2001
From: Kai Tamkun <kai@tamkun.io>
Date: Wed, 20 Aug 2025 16:46:08 -0700
Subject: [PATCH] Add bun_configure_mimalloc

---
 cmake/sources/CxxSources.txt      | 1 +
 cmake/targets/BuildMimalloc.cmake | 6 +++---
 src/deps/mimalloc.cpp             | 7 +++++++
 src/main.zig                      | 3 +++
 4 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 src/deps/mimalloc.cpp

diff --git a/cmake/sources/CxxSources.txt b/cmake/sources/CxxSources.txt
index a2041f617f..dd3fade220 100644
--- a/cmake/sources/CxxSources.txt
+++ b/cmake/sources/CxxSources.txt
@@ -495,6 +495,7 @@ src/bun.js/modules/NodeTTYModule.cpp
 src/bun.js/modules/NodeUtilTypesModule.cpp
 src/bun.js/modules/ObjectModule.cpp
 src/deps/libuwsockets.cpp
+src/deps/mimalloc.cpp
 src/io/io_darwin.cpp
 src/vm/Semaphore.cpp
 src/vm/SigintWatcher.cpp
diff --git a/cmake/targets/BuildMimalloc.cmake b/cmake/targets/BuildMimalloc.cmake
index f2c4a3fada..f07cbd59b1 100644
--- a/cmake/targets/BuildMimalloc.cmake
+++ b/cmake/targets/BuildMimalloc.cmake
@@ -4,7 +4,7 @@ register_repository(
   REPOSITORY
     oven-sh/mimalloc
   COMMIT
-    1beadf9651a7bfdec6b5367c380ecc3fe1c40d1a
+    2d81b6fee92def9f1aad72f7caad67243148b6ee
 )
 
 set(MIMALLOC_CMAKE_ARGS
@@ -14,7 +14,7 @@ set(MIMALLOC_CMAKE_ARGS
   -DMI_BUILD_TESTS=OFF
   -DMI_USE_CXX=ON
   -DMI_SKIP_COLLECT_ON_EXIT=ON
-  
+
   # ```
   # ❯ mimalloc_allow_large_os_pages=0 BUN_PORT=3004 mem bun http-hello.js
   # Started development server: http://localhost:3004
@@ -51,7 +51,7 @@ if(ENABLE_ASAN)
   list(APPEND MIMALLOC_CMAKE_ARGS -DMI_DEBUG_UBSAN=ON)
 elseif(APPLE OR LINUX)
   if(APPLE)
-    list(APPEND MIMALLOC_CMAKE_ARGS -DMI_OVERRIDE=OFF)  
+    list(APPEND MIMALLOC_CMAKE_ARGS -DMI_OVERRIDE=OFF)
     list(APPEND MIMALLOC_CMAKE_ARGS -DMI_OSX_ZONE=OFF)
     list(APPEND MIMALLOC_CMAKE_ARGS -DMI_OSX_INTERPOSE=OFF)
   else()
diff --git a/src/deps/mimalloc.cpp b/src/deps/mimalloc.cpp
new file mode 100644
index 0000000000..9f5d5a497b
--- /dev/null
+++ b/src/deps/mimalloc.cpp
@@ -0,0 +1,7 @@
+#include "mimalloc.h"
+#include <cstdio>
+
+extern "C" void bun_configure_mimalloc()
+{
+    mi_option_set(mi_option_generic_collect, 10'000); // default
+}
diff --git a/src/main.zig b/src/main.zig
index 1000c0134a..05b97cde31 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -11,10 +11,13 @@ comptime {
 
 extern fn bun_warn_avx_missing(url: [*:0]const u8) void;
 
+extern fn bun_configure_mimalloc() void;
+
 pub extern "c" var _environ: ?*anyopaque;
 pub extern "c" var environ: ?*anyopaque;
 
 pub fn main() void {
+    bun_configure_mimalloc();
     bun.crash_handler.init();
 
     if (Environment.isPosix) {