diff --git a/compiler/compiler.h b/compiler/compiler.h
index a496c6c..e363e70 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -29,6 +29,7 @@
 namespace jit {
 class JitCodeCache;
 class JitLogger;
+class JitMemoryRegion;
 }  // namespace jit
 namespace mirror {
 class ClassLoader;
@@ -41,7 +42,6 @@
 class CompilerOptions;
 class DexFile;
 template<class T> class Handle;
-class OatWriter;
 class Thread;
 
 class Compiler {
@@ -73,6 +73,7 @@
 
   virtual bool JitCompile(Thread* self ATTRIBUTE_UNUSED,
                           jit::JitCodeCache* code_cache ATTRIBUTE_UNUSED,
+                          jit::JitMemoryRegion* region ATTRIBUTE_UNUSED,
                           ArtMethod* method ATTRIBUTE_UNUSED,
                           bool baseline ATTRIBUTE_UNUSED,
                           bool osr ATTRIBUTE_UNUSED,
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
index b42e9f2..f19de4e 100644
--- a/compiler/jit/jit_compiler.cc
+++ b/compiler/jit/jit_compiler.cc
@@ -129,11 +129,11 @@
 }
 
 extern "C" bool jit_compile_method(
-    void* handle, ArtMethod* method, Thread* self, bool baseline, bool osr)
+    void* handle, JitMemoryRegion* region, ArtMethod* method, Thread* self, bool baseline, bool osr)
     REQUIRES_SHARED(Locks::mutator_lock_) {
   auto* jit_compiler = reinterpret_cast<JitCompiler*>(handle);
   DCHECK(jit_compiler != nullptr);
-  return jit_compiler->CompileMethod(self, method, baseline, osr);
+  return jit_compiler->CompileMethod(self, region, method, baseline, osr);
 }
 
 extern "C" void jit_types_loaded(void* handle, mirror::Class** types, size_t count)
@@ -181,7 +181,8 @@
   }
 }
 
-bool JitCompiler::CompileMethod(Thread* self, ArtMethod* method, bool baseline, bool osr) {
+bool JitCompiler::CompileMethod(
+    Thread* self, JitMemoryRegion* region, ArtMethod* method, bool baseline, bool osr) {
   SCOPED_TRACE << "JIT compiling " << method->PrettyMethod();
 
   DCHECK(!method->IsProxyMethod());
@@ -198,7 +199,8 @@
     TimingLogger::ScopedTiming t2("Compiling", &logger);
     JitCodeCache* const code_cache = runtime->GetJit()->GetCodeCache();
     uint64_t start_ns = NanoTime();
-    success = compiler_->JitCompile(self, code_cache, method, baseline, osr, jit_logger_.get());
+    success = compiler_->JitCompile(
+        self, code_cache, region, method, baseline, osr, jit_logger_.get());
     uint64_t duration_ns = NanoTime() - start_ns;
     VLOG(jit) << "Compilation of "
               << method->PrettyMethod()
diff --git a/compiler/jit/jit_compiler.h b/compiler/jit/jit_compiler.h
index d008de4..06315a5 100644
--- a/compiler/jit/jit_compiler.h
+++ b/compiler/jit/jit_compiler.h
@@ -22,7 +22,6 @@
 namespace art {
 
 class ArtMethod;
-class CompiledMethod;
 class Compiler;
 class CompilerOptions;
 class Thread;
@@ -30,6 +29,7 @@
 namespace jit {
 
 class JitLogger;
+class JitMemoryRegion;
 
 class JitCompiler {
  public:
@@ -37,7 +37,8 @@
   virtual ~JitCompiler();
 
   // Compilation entrypoint. Returns whether the compilation succeeded.
-  bool CompileMethod(Thread* self, ArtMethod* method, bool baseline, bool osr)
+  bool CompileMethod(
+      Thread* self, JitMemoryRegion* region, ArtMethod* method, bool baseline, bool osr)
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   const CompilerOptions& GetCompilerOptions() const {
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index c799b12..9da282b 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -295,6 +295,7 @@
 
   bool JitCompile(Thread* self,
                   jit::JitCodeCache* code_cache,
+                  jit::JitMemoryRegion* region,
                   ArtMethod* method,
                   bool baseline,
                   bool osr,
@@ -1248,6 +1249,7 @@
 
 bool OptimizingCompiler::JitCompile(Thread* self,
                                     jit::JitCodeCache* code_cache,
+                                    jit::JitMemoryRegion* region,
                                     ArtMethod* method,
                                     bool baseline,
                                     bool osr,
@@ -1282,6 +1284,7 @@
     uint8_t* stack_map_data = nullptr;
     uint8_t* roots_data = nullptr;
     uint32_t data_size = code_cache->ReserveData(self,
+                                                 region,
                                                  stack_map.size(),
                                                  /* number_of_roots= */ 0,
                                                  method,
@@ -1295,6 +1298,7 @@
 
     const void* code = code_cache->CommitCode(
         self,
+        region,
         method,
         stack_map_data,
         roots_data,
@@ -1306,6 +1310,7 @@
         /* has_should_deoptimize_flag= */ false,
         cha_single_implementation_list);
     if (code == nullptr) {
+      code_cache->ClearData(self, region, stack_map_data, roots_data);
       return false;
     }
 
@@ -1379,6 +1384,7 @@
   uint8_t* stack_map_data = nullptr;
   uint8_t* roots_data = nullptr;
   uint32_t data_size = code_cache->ReserveData(self,
+                                               region,
                                                stack_map.size(),
                                                number_of_roots,
                                                method,
@@ -1400,6 +1406,7 @@
 
   const void* code = code_cache->CommitCode(
       self,
+      region,
       method,
       stack_map_data,
       roots_data,
@@ -1413,7 +1420,7 @@
 
   if (code == nullptr) {
     MaybeRecordStat(compilation_stats_.get(), MethodCompilationStat::kJitOutOfMemoryForCommit);
-    code_cache->ClearData(self, stack_map_data, roots_data);
+    code_cache->ClearData(self, region, stack_map_data, roots_data);
     return false;
   }
 
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
index 2cfcf5c..27ac3ff 100644
--- a/runtime/jit/jit.cc
+++ b/runtime/jit/jit.cc
@@ -63,7 +63,8 @@
 void* Jit::jit_compiler_handle_ = nullptr;
 void* (*Jit::jit_load_)(void) = nullptr;
 void (*Jit::jit_unload_)(void*) = nullptr;
-bool (*Jit::jit_compile_method_)(void*, ArtMethod*, Thread*, bool, bool) = nullptr;
+bool (*Jit::jit_compile_method_)(void*, JitMemoryRegion*, ArtMethod*, Thread*, bool, bool)
+    = nullptr;
 void (*Jit::jit_types_loaded_)(void*, mirror::Class**, size_t count) = nullptr;
 bool (*Jit::jit_generate_debug_info_)(void*) = nullptr;
 void (*Jit::jit_update_options_)(void*) = nullptr;
@@ -273,10 +274,13 @@
     return false;
   }
 
+  JitMemoryRegion* region = GetCodeCache()->GetPrivateRegion();
+
   VLOG(jit) << "Compiling method "
             << ArtMethod::PrettyMethod(method_to_compile)
             << " osr=" << std::boolalpha << osr;
-  bool success = jit_compile_method_(jit_compiler_handle_, method_to_compile, self, baseline, osr);
+  bool success = jit_compile_method_(
+      jit_compiler_handle_, region, method_to_compile, self, baseline, osr);
   code_cache_->DoneCompiling(method_to_compile, self, osr);
   if (!success) {
     VLOG(jit) << "Failed to compile method "
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
index 92d2b55..fcfddfe 100644
--- a/runtime/jit/jit.h
+++ b/runtime/jit/jit.h
@@ -44,6 +44,7 @@
 namespace jit {
 
 class JitCodeCache;
+class JitMemoryRegion;
 class JitOptions;
 
 static constexpr int16_t kJitCheckForOSR = -1;
@@ -340,7 +341,7 @@
   static void* jit_compiler_handle_;
   static void* (*jit_load_)(void);
   static void (*jit_unload_)(void*);
-  static bool (*jit_compile_method_)(void*, ArtMethod*, Thread*, bool, bool);
+  static bool (*jit_compile_method_)(void*, JitMemoryRegion*, ArtMethod*, Thread*, bool, bool);
   static void (*jit_types_loaded_)(void*, mirror::Class**, size_t count);
   static void (*jit_update_options_)(void*);
   static bool (*jit_generate_debug_info_)(void*);
diff --git a/runtime/jit/jit_code_cache.cc b/runtime/jit/jit_code_cache.cc
index f430d58..15553d4 100644
--- a/runtime/jit/jit_code_cache.cc
+++ b/runtime/jit/jit_code_cache.cc
@@ -322,6 +322,7 @@
 }
 
 uint8_t* JitCodeCache::CommitCode(Thread* self,
+                                  JitMemoryRegion* region,
                                   ArtMethod* method,
                                   uint8_t* stack_map,
                                   uint8_t* roots_data,
@@ -333,6 +334,7 @@
                                   bool has_should_deoptimize_flag,
                                   const ArenaSet<ArtMethod*>& cha_single_implementation_list) {
   uint8_t* result = CommitCodeInternal(self,
+                                       region,
                                        method,
                                        stack_map,
                                        roots_data,
@@ -347,6 +349,7 @@
     // Retry.
     GarbageCollectCache(self);
     result = CommitCodeInternal(self,
+                                region,
                                 method,
                                 stack_map,
                                 roots_data,
@@ -671,6 +674,7 @@
 }
 
 uint8_t* JitCodeCache::CommitCodeInternal(Thread* self,
+                                          JitMemoryRegion* region,
                                           ArtMethod* method,
                                           uint8_t* stack_map,
                                           uint8_t* roots_data,
@@ -698,7 +702,7 @@
   // finish.
   WaitForPotentialCollectionToCompleteRunnable(self);
   {
-    ScopedCodeCacheWrite scc(private_region_);
+    ScopedCodeCacheWrite scc(*region);
 
     size_t alignment = GetInstructionSetAlignment(kRuntimeISA);
     // Ensure the header ends up at expected instruction alignment.
@@ -707,7 +711,7 @@
 
     // AllocateCode allocates memory in non-executable region for alignment header and code. The
     // header size may include alignment padding.
-    uint8_t* nox_memory = private_region_.AllocateCode(total_size);
+    uint8_t* nox_memory = region->AllocateCode(total_size);
     if (nox_memory == nullptr) {
       return nullptr;
     }
@@ -718,7 +722,7 @@
     method_header = OatQuickMethodHeader::FromCodePointer(code_ptr);
 
     // From here code_ptr points to executable code.
-    code_ptr = private_region_.GetExecutableAddress(code_ptr);
+    code_ptr = region->GetExecutableAddress(code_ptr);
 
     new (method_header) OatQuickMethodHeader(
         (stack_map != nullptr) ? code_ptr - stack_map : 0u,
@@ -730,7 +734,7 @@
     }
 
     // Update method_header pointer to executable code region.
-    method_header = private_region_.GetExecutableAddress(method_header);
+    method_header = region->GetExecutableAddress(method_header);
 
     // Both instruction and data caches need flushing to the point of unification where both share
     // a common view of memory. Flushing the data cache ensures the dirty cachelines from the
@@ -747,7 +751,7 @@
     // For reference, this behavior is caused by this commit:
     // https://android.googlesource.com/kernel/msm/+/3fbe6bc28a6b9939d0650f2f17eb5216c719950c
     //
-    if (private_region_.HasDualCodeMapping()) {
+    if (region->HasDualCodeMapping()) {
       // Flush the data cache lines associated with the non-executable copy of the code just added.
       FlushDataCache(nox_memory, nox_memory + total_size);
     }
@@ -1025,14 +1029,16 @@
 }
 
 void JitCodeCache::ClearData(Thread* self,
+                             JitMemoryRegion* region,
                              uint8_t* stack_map_data,
                              uint8_t* roots_data) {
   DCHECK_EQ(FromStackMapToRoots(stack_map_data), roots_data);
   MutexLock mu(self, *Locks::jit_lock_);
-  private_region_.FreeData(reinterpret_cast<uint8_t*>(roots_data));
+  region->FreeData(reinterpret_cast<uint8_t*>(roots_data));
 }
 
 size_t JitCodeCache::ReserveData(Thread* self,
+                                 JitMemoryRegion* region,
                                  size_t stack_map_size,
                                  size_t number_of_roots,
                                  ArtMethod* method,
@@ -1046,7 +1052,7 @@
     ScopedThreadSuspension sts(self, kSuspended);
     MutexLock mu(self, *Locks::jit_lock_);
     WaitForPotentialCollectionToComplete(self);
-    result = private_region_.AllocateData(size);
+    result = region->AllocateData(size);
   }
 
   if (result == nullptr) {
@@ -1055,7 +1061,7 @@
     ScopedThreadSuspension sts(self, kSuspended);
     MutexLock mu(self, *Locks::jit_lock_);
     WaitForPotentialCollectionToComplete(self);
-    result = private_region_.AllocateData(size);
+    result = region->AllocateData(size);
   }
 
   MutexLock mu(self, *Locks::jit_lock_);
diff --git a/runtime/jit/jit_code_cache.h b/runtime/jit/jit_code_cache.h
index a56f6f0..9683b48 100644
--- a/runtime/jit/jit_code_cache.h
+++ b/runtime/jit/jit_code_cache.h
@@ -125,6 +125,7 @@
   // even if `has_should_deoptimize_flag` is false, which can happen due to CHA
   // guard elimination.
   uint8_t* CommitCode(Thread* self,
+                      JitMemoryRegion* region,
                       ArtMethod* method,
                       uint8_t* stack_map,
                       uint8_t* roots_data,
@@ -155,6 +156,7 @@
   // for storing `number_of_roots` roots. Returns null if there is no more room.
   // Return the number of bytes allocated.
   size_t ReserveData(Thread* self,
+                     JitMemoryRegion* region,
                      size_t stack_map_size,
                      size_t number_of_roots,
                      ArtMethod* method,
@@ -164,7 +166,8 @@
       REQUIRES(!Locks::jit_lock_);
 
   // Clear data from the data portion of the code cache.
-  void ClearData(Thread* self, uint8_t* stack_map_data, uint8_t* roots_data)
+  void ClearData(
+      Thread* self, JitMemoryRegion* region, uint8_t* stack_map_data, uint8_t* roots_data)
       REQUIRES_SHARED(Locks::mutator_lock_)
       REQUIRES(!Locks::jit_lock_);
 
@@ -273,12 +276,15 @@
   // is debuggable.
   void ClearEntryPointsInZygoteExecSpace() REQUIRES(!Locks::jit_lock_) REQUIRES(Locks::mutator_lock_);
 
+  JitMemoryRegion* GetPrivateRegion() { return &private_region_; }
+
  private:
   JitCodeCache();
 
   // Internal version of 'CommitCode' that will not retry if the
   // allocation fails. Return null if the allocation fails.
   uint8_t* CommitCodeInternal(Thread* self,
+                              JitMemoryRegion* region,
                               ArtMethod* method,
                               uint8_t* stack_map,
                               uint8_t* roots_data,