Allocate the profiler sample buffer and zone segments with virtual memory instead of malloc.

runtime/vm/heap.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/heap.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
@@ skipping 507 matching lines @@
                         max_external_words);
   isolate->set_heap(heap);
 }
 
 
 void Heap::RegionName(Heap* heap, Space space, char* name, intptr_t name_size) {
   const bool no_isolate_name = (heap == NULL) || (heap->isolate() == NULL) ||
                                (heap->isolate()->debugger_name() == NULL);
   const char* isolate_name =
       no_isolate_name ? "<unknown>" : heap->isolate()->debugger_name();
-  const char* space_name = (space == kNew) ? "newspace" : "oldspace";
-  const char* type_name = (space == kCode) ? "code" : "data";
-  OS::SNPrint(name, name_size, "%s %s %s", isolate_name, space_name, type_name);
+  const char* space_name = NULL;
+  switch (space) {
+    case kNew:
+      space_name = "newspace";
+      break;
+    case kOld:
+      space_name = "oldspace";
+      break;
+    case kCode:
+      space_name = "codespace";
+      break;
+    default:
+      UNREACHABLE();
+  }
+  OS::SNPrint(name, name_size, "dart-%s %s", space_name, isolate_name);
 }
 
 
 void Heap::AddRegionsToObjectSet(ObjectSet* set) const {
   new_space_.AddRegionsToObjectSet(set);
   old_space_.AddRegionsToObjectSet(set);
 }
 
 
 ObjectSet* Heap::CreateAllocatedObjectSet(
@@ skipping 325 matching lines @@
   Dart::vm_isolate()->heap()->WriteProtect(false);
 }
 
 
 WritableVMIsolateScope::~WritableVMIsolateScope() {
   ASSERT(Dart::vm_isolate()->heap()->UsedInWords(Heap::kNew) == 0);
   Dart::vm_isolate()->heap()->WriteProtect(true);
 }
 
 }  // namespace dart